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[[File:Bravox E2k.jpg|thumb|250px|A 12" subwoofer [[Speaker driver|driver]] without an enclosure]]
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A '''subwoofer''' (or "sub") is a [[woofer]], or a complete [[loudspeaker]], which is dedicated to the reproduction of [[bass (sound)|low-pitched]] audio [[frequency|frequencies]] known as [[bass (sound)|bass]]. The typical frequency range for a subwoofer is about 20–200&nbsp;Hz for consumer products,<ref name="CrutchfieldGlossary">{{cite web|url=http://www.crutchfield.com/S-guVIljONa12/Learn/learningcenter/home/speakers_glossary.html |title=Home Speakers Glossary |last=Barstow |first=Loren |date=January 18, 2010 |work=Learn: Home|publisher=Crutchfield New Media, LLC |accessdate=April 24, 2010}}</ref> below 100&nbsp;Hz for professional live sound,<ref name=Young2008/> and below 80&nbsp;Hz in [[THX]]-approved systems.<ref name=DellaSala>{{cite web|url=http://www.audioholics.com/tweaks/get-good-bass/setting-the-subwoofer-lfe-crossover-for-best-performance|title=Setting the Subwoofer / LFE Crossover for Best Performance |last=DellaSala|first=Gene|date=August 29, 2004|work=Tips & Tricks: Get Good Bass|publisher=Audioholics|accessdate=March 3, 2010}}</ref> Subwoofers are intended to augment the low frequency range of loudspeakers covering higher frequency bands.
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Subwoofers are made up of one or more [[woofer]]s mounted in a [[loudspeaker enclosure]]—often made of wood—capable of withstanding air pressure while resisting deformation.  Subwoofer enclosures come in a variety of designs, including [[bass reflex]] (with a port or passive radiator in the enclosure), [[Loudspeaker enclosure#Infinite baffle|infinite baffle]], [[Horn loudspeaker|horn-loaded]], and [[Loudspeaker enclosure#Compound or band-pass|bandpass]] designs, representing unique tradeoffs with respect to efficiency, bandwidth, size and cost.  Passive subwoofers have a subwoofer driver and enclosure and they are powered by an external amplifier. Active subwoofers include a built-in amplifier.<ref>{{cite web |url=http://www.home-theater-designers.com/glossary.html |title=Glossary of Terms |work=Home Theater Design |publisher=ETS-eTech |page=1 |accessdate=March 3, 2010}} {{Dead link|date=September 2010|bot=H3llBot}}</ref>
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The first subwoofers were developed in the 1960s to add bass response to home stereo systems. Subwoofers came into greater popular consciousness in the 1970s with the introduction of [[Sensurround]] in movies such as [[Earthquake (film)|''Earthquake'']], which produced loud low-frequency sounds through large subwoofers. With the advent of the [[compact cassette]] and the [[compact disc]] in the 1980s, the easy reproduction of deep ''and'' loud bass was no longer limited by the ability of a [[phonograph record]] stylus to track a groove,<ref name="aes.org">{{cite web |url=http://www.aes.org/e-lib/browse.cfm?elib=905 |work=AES E-Library |title=Tracking Ability Specifications for Phonograph Cartridges |last=Kogen |first=J. H. |date=October 1967 |publisher=[[Audio Engineering Society]] |accessdate=April 24, 2010}}</ref> and producers could add more low frequency content to recordings. As well, during the 1990s, DVDs were increasingly recorded with "[[surround sound]]" processes that included a [[Low-frequency effects]] (LFE) channel, which could be heard using the subwoofer in [[home cinema|home theater]] systems. During the 1990s, subwoofers also became increasingly popular in home [[stereo system]]s, custom [[car audio]] installations, and in [[PA system]]s. By the 2000s, subwoofers became almost universal in [[sound reinforcement system]]s in nightclubs and concert venues.
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==History==
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[[File:Infinity Servo Statik subwoofer.jpg|thumb|left|View of the underside of the [[Infinity (audio)|Infinity]] Servo Statik 1, showing the size of the 18-inch custom-wound Cerwin Vega driver in relation to a can of Diet Coke]]
The very first subwoofer enclosure made for home and studio use was the separate bass speaker for the Servo Statik 1, by New Technology Enterprises.<ref name="Archibald, Holt 2005">{{cite web|url=http://www.stereophile.com/floorloudspeakers/988infinity/index.html|title=Infinity IRS Beta loudspeaker|last=Archibald|first=Larry|coauthors=J. Gordon Holt|date=December 31, 2005|work=Stereophile|publisher=Source Interlink Media|accessdate=January 18, 2011}}</ref> Designed as a prototype in 1966 by physicist Arnold Nudell and airline pilot Cary Christie in Nudell's garage, the design used a second winding around a custom Cerwin Vega 18-inch driver to provide servo control information to the amplifier, and it was offered for sale at $1795, some 40% more expensive than any other complete loudspeaker listed at ''Stereo Review''.<ref name="Archibald, Holt 2005"/> In 1968, the two found outside investment and reorganized as [[Infinity (audio)|Infinity]].<ref name="Archibald, Holt 2005"/> The subwoofer was reviewed positively in ''Stereophile'' magazine's Winter 1968 issue as the SS-1 by Infinity. The SS-1 was reviewed very highly in 1970 by ''High Fidelity'' magazine.<ref name="Archibald, Holt 2005"/>


One of the first subwoofers was developed during the late 1960s by Ken Kreisel, the former president of the Miller & Kreisel Sound Corporation in [[Los Angeles]]. When Kreisel's business partner, Jonas Miller, who owned a high-end audio store in Los Angeles, told Kreisel that some purchasers of the store's high-end [[electrostatic speakers]] had complained about a lack of bass response in the electrostatics, Kreisel designed a powered woofer that would reproduce only those frequencies that were too low for the electrostatic speakers to convey.<ref>{{cite journal |author= Levitin, D. J. |title=The Audio Interview: M&K's Ken Kreisel |journal = [[Audio (magazine)|Audio]] |volume = 80 |date=February 1996 |pages = 28–34}}</ref> Infinity's full range electrostatic speaker system that was developed during the 1960s also used a woofer to cover the lower frequency range that its electrostatic arrays did not handle adequately.
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The first use of a subwoofer in a recording session was in 1973 for mixing the [[Steely Dan]] album ''[[Pretzel Logic]]'' when [[recording engineer]] [[Roger Nichols (recording engineer)|Roger Nichols]] arranged for Kreisel to bring a prototype of his subwoofer to [[Village Recorders]].<ref>{{cite journal |url=http://www.stereophile.com/interviews/136/ |work=Stereophile |date=March 1997 |first=Wes |last=Phillips |title=Audio Odyssey: Ken Kreisel of M&K |accessdate=April 24, 2010}}</ref> Further design modifications were made by Kreisel over the next ten years, and in the 1970s and 1980s by engineer [[John P. D'Arcy]]; [[record producer]] [[Daniel Levitin]] served as a [[consultant]] and "[[golden ear]]s" for the design of the [[Audio crossover|crossover network]] (used to partition the frequency spectrum so that the subwoofer would not attempt to reproduce frequencies too high for its effective range, and so that the main speakers would not need to handle frequencies too low for their effective range).
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Subwoofers received a great deal of publicity in 1974 with the movie [[Earthquake (film)|''Earthquake'']] which was released in [[Sensurround]]. Initially installed in 17 U.S. theaters, the Sensurround system used large subwoofers which were driven by racks of 500 watt amplifiers which were triggered by control tones printed on one of the audio tracks on the film. Four of the subwoofers were positioned in front of the audience under (or behind) the film screen and two more were placed together at the rear of the audience on a platform. Powerful noise energy in the range of 17&nbsp;Hz to 120&nbsp;Hz was generated at the level of 110–120 decibels of [[Sound pressure|sound pressure level]], abbreviated dB(SPL). The new low frequency entertainment method helped the film become a box office success. More Sensurround systems were assembled and installed. By 1976 there were almost 300 Sensurround systems leapfrogging through select theaters. Other films to use the effect include the WW II naval battle epic [[Midway (film)|''Midway'']] in 1976 and [[Rollercoaster (1977 film)|''Rollercoaster'']] in 1977.<ref>{{cite web |url=http://www.in70mm.com/newsletter/2004/69/sensurround/about.htm |title=About Sensurround |work=The 70mm Newsletter |publisher=In70mm.com |date=January 26, 2010 |accessdate=April 24, 2010}}</ref>
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For owners of 33&nbsp;rpm LPs and 45&nbsp;singles, loud ''and'' deep bass was limited by the ability of the [[phonograph record]] stylus to track the groove.<ref name="aes.org"/> Some hi-fi aficionados solved the problem by using [[Reel-to-reel audio tape recording|reel-to-reel tape players]] which were capable of delivering accurate, naturally deep bass from acoustic sources, or synthetic bass not found in nature. With the popular introduction of the compact cassette and the CD, it became possible to add more low frequency content to recordings, and satisfy a larger number of consumers.<ref>{{cite web|url=http://www.record-producer.com/learn.cfm?a=44 |work=Record-Producer.com |publisher=Masterclass Professional Learning |date=April 12, 2007 |title=Mastering for vinyl vs. mastering for CD |archiveurl=http://web.archive.org/web/20070821055003/http://www.record-producer.com/learn.cfm?a=44 |archivedate=August 21, 2007 |accessdate=April 24, 2010}}</ref> Home subwoofers grew in popularity, as they were easy to add to existing multimedia speaker setups and they were easy to position or hide.<ref>{{cite web |url=http://www.osd.rutgers.edu/gs/06papers/Subwoof.pdf |publisher=[[Rutgers University]] |first=Matthew |last=Rodriguez |author2=Erika Ross-O'Brien |author3=Kelli Martino |author4=Vanessa Lannaman |author5=Robert Nahas |author6=Joseph Civitello |author7=Christopher Roselle |author8=Rodrigo Colon |title=Experiences Designing and Building A Subwoofer Amplifier |year=2006 |accessdate=April 24, 2010}}</ref>
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===Loudspeaker and enclosure design===
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[[File:Speaker-cross-section.svg|thumb|400px|Cross-section of a subwoofer drive unit.]]
[[File:Graham Holliman Velocity-Coupled Infra Bass speaker design.jpg|thumb|right|400px|A unique enclosure specially designed to produce [[infrasound|infrasonic]] (below ~20 Hz) energy with high efficiency. The driver fires over a [[Helmholtz resonance|Helmholtz resonator]] then exits through long ports.]]
Subwoofers use speaker [[Loudspeaker|drivers]] ([[woofer]]s) typically between 8" and 21" in diameter. Some uncommon subwoofers use larger drivers, and single prototype subwoofers as large as 60" have been fabricated.<ref>{{cite web |url=http://www.techeblog.com/index.php/tech-gadget/incredible-60-inch-subwoofer |title=Incredible 60-inch Subwoofer |date=March 3, 2006 |publisher=Techeblog.com |accessdate=April 24, 2010}}</ref> On the smaller end of the spectrum, subwoofer drivers as small as 4" may be used, depending on the design of the [[loudspeaker enclosure]], the desired sound pressure level, the lowest frequency targeted and the level of permitted distortion. The most common subwoofer driver sizes used for sound reinforcement are 10", 12", 15" and 18" models. The largest available sound reinforcement subwoofers, 21" drivers, are less commonly seen.


The efficiency of a speaker driver is given by:
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:<math>\eta_0 = \left(\frac{4 \pi^2 F_s^3 V_{as}}{c^3 Q_{es}}\right)\times100\ %</math>
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Where the variables are [[Thiele/Small]] parameters. Deep low frequency extension is a common goal for a subwoofer and small box volumes are also considered desirable. [[J H Hoffman|Hoffman]]'s Iron Laws therefore mandate low efficiency under those constraints, and indeed most subwoofers require considerable power, much more than other individual drivers.
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So for the example of a sealed speaker box, the box volume to achieve a given Q<sub>ts</sub> is proportional to Vas:
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:<math>V_b = \frac{V_{as}}{\alpha}</math> Where: <math>\alpha = \frac{Q_{tc}^2}{Q_{ts}^2}-1</math>
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Therefore a decrease in box volume and the same F<sub>3</sub> will decrease the efficiency of the sub woofer. Similarly the F<sub>3</sub> of a speaker is proportional to Fs:
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:<math>F_c = \frac{(Q_{tc}F_s)}{Q_{ts}}</math>
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As the efficiency is proportional to Fs<sup>3</sup>, small improvements in low frequency extension with the same driver and box volume will result in very significant reductions in efficiency. For these reasons, subwoofers are typically very inefficient at converting electrical energy into sound energy. This combination of factors accounts for the higher power output of subwoofer amplifiers, and the requirement for greater power handling for subwoofer drivers. Enclosure variations (e.g., [[bass reflex]] designs) are sometimes used for subwoofers to increase the efficiency of the driver/enclosure system, helping to reduce the amplifier power requirement.
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[[File:Subwoofer.jpg|thumb|right|250px|Subwoofer mounted in a sealed [[Loudspeaker enclosure|enclosure]]]]
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Subwoofers have been designed using a number of enclosure approaches: [[bass reflex]], [[acoustic suspension]], [[Loudspeaker enclosure#Infinite baffle|infinite baffle]], [[Horn loudspeaker|horn loaded]], [[Loudspeaker enclosure#Tapped horn|tapped horn]], [[Loudspeaker enclosure#Transmission line|transmission line]] and [[Loudspeaker enclosure#Compound or band-pass|bandpass]]. Each enclosure type has advantages and disadvantages in efficiency increase, bass extension, cabinet size, distortion, and cost. Subwoofers are typically constructed by mounting one or more woofers in a cabinet of medium-density fibreboard (MDF), oriented strand board (OSB), plywood, fiberglass, aluminum or other stiff materials. Because of the high air pressure they produce in the cabinet, subwoofer enclosures often require internal bracing to distribute the resulting forces.
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The smallest subwoofers are typically those designed for desktop multimedia systems. The largest common subwoofer enclosures are those used for concert sound reinforcement systems or dance club sound systems. An example of a large concert subwoofer enclosure is the 1980s-era ElectroVoice MT-4 "Bass Cube" system, which used four 18" drivers. An example of a subwoofer that uses a bass horn is the Bassmaxx B-Two, which loads an 18" driver onto an {{convert|11|ft|adj=on}} long folded horn. Folded horn-type subwoofers can typically produce a deeper range with greater efficiency than the same driver in an enclosure that lacks a horn. Some experimental fixed-installation subwoofer horns have been constructed using brick and concrete to produce a very long horn that allows a very deep sub-bass extension.<ref name=Gordon2008/>
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Subwoofer output level can be increased by increasing cone surface area or by increasing cone excursion. Since large drivers require undesirably large cabinets, most subwoofer drivers have large excursions. Unfortunately, high excursion, at high power levels, tends to produce more distortion from inherent mechanical and magnetic effects in electro-dynamic drivers (the most common sort). The conflict between assorted goals can never be fully resolved; subwoofer designs are necessarily compromises. Hoffman's Iron Law (the efficiency of a woofer system is directly proportional to its cabinet volume and to the cube of its cutoff frequency) applies to subwoofers just as to all loudspeakers.<ref>{{cite web |url=http://ldsg.snippets.org/appdx-a.php#HOFFMAN |work=DIY Loudspeaker Designer's Selection Guide (the LDSG) |last=Stout |first=Bob |chapter=Appendix A – Loudspeaker Design |title=Hoffman's Iron Law |date=March 25, 2007 |accessdate=April 24, 2010}}</ref>
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===Frequency range and frequency response===
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The frequency response specification of a speaker describes the range of frequencies or musical tones a speaker can reproduce, measured in [[hertz]] (Hz).<ref>{{cite web |url=http://forum.ecoustics.com/bbs/messages/34579/131062.html |last=Dicomo |first=Paul |title=Understanding Speaker Frequency Response: The Secret Behind The Industry's Most-Cited Spec |publisher=Ecoustics.com |date=April 9, 2005 |accessdate=April 24, 2010}}</ref>  The typical frequency range for a subwoofer is between 20–200&nbsp;Hz.<ref name="CrutchfieldGlossary"/> Professional concert sound system subwoofers typically operate below 100&nbsp;Hz,<ref name=Young2008>{{cite web |url=http://www.prosoundweb.com/article/in_depth_the_aux_fed_subwoofer_technique_explained/ |title=In-Depth: The Aux-Fed Subwoofer Technique Explained |last=Young |first=Tom |date=December 1, 2008 |work=Study Hall |publisher=ProSoundWeb |pages=1–2 |accessdate=March 3, 2010}}</ref> and [[THX]]-approved systems operate below 80&nbsp;Hz.<ref name=DellaSala/>  Subwoofers vary in terms of the range of pitches that they can reproduce, depending on a number of factors such as the size of the cabinet and the construction and design of the enclosure and driver(s). Specifications of frequency response depend wholly for relevance on an accompanying amplitude value—measurements taken with a wider amplitude tolerance will give any loudspeaker a wider frequency response. For example, the JBL 4688 TCB Subwoofer System, a now-discontinued system which was designed for movie theaters, had a frequency response of 23–350&nbsp;Hz when measured within a 10-decibel boundary (0&nbsp;dB to -10&nbsp;dB) and a narrower frequency response of 28–120&nbsp;Hz when measured within a six-decibel boundary (±3&nbsp;dB).<ref>{{cite web |url=http://www.jblpro.com/pub/obsolete/4688.pdf |publisher=JBL Professional Audio |title=4688 TCB Subwoofer System |accessdate=April 24, 2010}}</ref>
 
 
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Subwoofers also vary in regard to the sound pressure levels achievable and the distortion levels they can produce over their range. The Abyss subwoofer, for example can reproduce pitches from 18&nbsp;Hz (which is about the pitch of the lowest rumbling notes on a huge pipe organ with {{convert|32|ft|adj=on}} bass pipes) to 120&nbsp;Hz (±3 dB). Nevertheless, even though the Abyss subwoofer can go down to 18&nbsp;Hz, its lowest frequency and maximum SPL with a limit of 10% distortion is 35.5&nbsp;Hz and 79.8&nbsp;dB at 2 meters.<ref>{{cite journal |url=http://www.soundandvisionmag.com/content/martinlogan-feature-powered-speaker-and-abyss-subwoofer-0 |page=3 |work=Sound and Vision |title=MartinLogan Feature powered speaker and Abyss subwoofer: Test report |last=Butterworth |first=Brent |date=June 2009 |accessdate=April 24, 2010}}</ref> This means that a person choosing a subwoofer needs to consider more than just the lowest pitch that the sub can reproduce.
 
 
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===Amplification===
 
'Active subwoofers' include their own dedicated amplifiers within the cabinet. Some also include user-adjustable [[#Equalization|equalization]] that allows boosted or reduced output at particular frequencies; these vary from a simple "boost" switch, to fully parametric equalizers meant for detailed speaker and room correction. Some such systems are even supplied with a calibrated microphone to measure the subwoofer's in-room response, so the automatic equalizer can correct the combination of subwoofer, subwoofer location, and room response to minimize effects of room modes and improve low frequency performance.
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'Passive subwoofers' have a subwoofer driver and enclosure, but they do not include an amplifier. They sometimes incorporate internal passive crossovers, with the filter frequency determined at the factory. These are generally used with third-party power amplifiers, taking their inputs from active crossovers earlier in the signal chain. While few high-end home-theater systems use passive subwoofers, this format is still popular in the professional sound industry.<ref>{{cite web |url=http://www.jblpro.com/pub/manuals/pssdm_2.pdf |title=JBL Sound System Design Manual, part two |year=1999 |publisher=JBL Professional Audio |accessdate=April 24, 2010}}</ref>
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===Equalization===
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Equalization can be used to adjust the in-room response of a subwoofer system. Designers of active subwoofers sometimes include a degree of corrective equalization to compensate for known performance issues (e.g., a steeper than desired low end [[roll-off]] rate). In addition, many amplifiers include an adjustable low-pass filter, which prevents undesired higher frequencies from reaching the subwoofer driver. For example, if a listener's main speakers are usable down to 80&nbsp;Hz, then the subwoofer filter can be set so the subwoofer only works below 80.<ref name=DellaSala/> Typical filters involve some overlap in frequency ranges; a steep filter is not generally desired for subwoofers. The crossover section may also include a high-pass "[[infrasound|infrasonic]]" filter which prevents the subwoofer driver from attempting to reproduce frequencies below its safe capabilities.
 
 
</ul>
Some systems use parametric equalization in an attempt to correct for room frequency response irregularities.<ref>{{cite web |url=http://www.ultraaudio.com/equipment/bang_olufsen_beolab_5.htm |last=Messenger |first=Paul |work=Ultra Audio |publisher=Schneider Publishing |title=Bang & Olufsen Beolab 5 Loudspeakers |date=July 15, 2004 |accessdate=April 24, 2010}}</ref> Equalization is often unable to achieve flat frequency response at all listening locations in part because of the resonance (i.e., [[standing wave]]) patterns at low frequencies in nearly all rooms. Careful positioning of the subwoofer within the room can also help flatten the frequency response.<ref>{{cite web |url=http://www.etfacoustic.com/basics.html |title=Audio Measurement Basics |year=2000 |first=Doug |last=Plumb |publisher=Acousti Soft Inc. |accessdate=April 24, 2010}}</ref> Multiple subwoofers can manage a flatter general response since they can often be arranged to excite room modes more evenly than a single subwoofer, allowing equalization to be more effective.<ref>{{cite web |url=http://www.harman.com/EN-US/OurCompany/Technologyleadership/Documents/White%20Papers/multsubs.pdf |first=Todd |last=Welti |publisher=Harman International Industries, Inc  |title=Subwoofers: Optimum Number and Locations |date=October 30, 2002 |accessdate=April 24, 2010}}</ref>
 
===Phase control===
Changing the relative phase of the subwoofer with respect to the woofers in other speakers may or may not help to minimize unwanted destructive acoustic interference in the frequency region covered by both subwoofer and main speakers. It may not help at all frequencies, and may create further problems with frequency response, but is even so generally provided as an adjustment for subwoofer amplifiers.<ref>{{cite web |url=http://sound.westhost.com/pcmm.htm |first=Rod |last=Elliott |publisher=Elliott Sound Products |title=Phase Correction – Myth or Magic |date=March 2, 2004 |accessdate=April 24, 2010}}</ref> Phase control circuits may be a simple polarity reversal switch or a more complex continuously variable circuits.
 
Continuously variable phase control circuits are common in subwoofer amplifiers, and may be found in crossovers and as do-it-yourself electronics projects.<ref>{{cite web |url=http://sound.westhost.com/project103.htm |first=Rod |last=Elliott |publisher=Elliott Sound Products |title=Subwoofer Phase Controller |date=January 18, 2004 |accessdate=April 24, 2010}}</ref><ref>{{cite journal |url=http://www.soundonsound.com/sos/jul02/articles/subwoofers.asp |work=Sound On Sound |title=Choosing & Installing a Subwoofer |date=July 2002 |last=Nicholls |first=Mallory |publisher=SOS Publications Group |accessdate=April 24, 2010}}</ref><ref>{{cite book
|last = Slone
|first = G. Randy
|title = The Audiophile's Project Sourcebook: 80 High-Performance Audio Electronics Projects
|publisher = McGraw-Hill Professional
|year = 2001
|page = 361
|isbn = 0-07-137929-0}}</ref><ref>{{cite book
|last = White
|first = Joel
|title = Home Theater Solutions
|publisher = Thomson Course Technology
|year = 2002
|page = 232
|isbn = 1-929685-67-X}}</ref><ref>{{cite journal |url=http://www.soundonsound.com/sos/apr07/articles/subwoofers.htm |work=Sound On Sound |title=All You Wanted to Know About Subwoofers |date=April 2007 |last=Robjohns |first=Hugh |publisher=SOS Publications Group |accessdate=April 24, 2010}}</ref> Phase controls allow the listener to change the arrival time of the subwoofer sound waves relative to the same frequencies from the main speakers (i.e., at and around the crossover point to the subwoofer). A similar effect can be achieved with the delay control on many home theater receivers. The subwoofer phase control found on many subwoofer amplifiers is actually a polarity inversion switch.<ref>{{cite web |url=http://www.audioholics.com/tweaks/get-good-bass/the-marriage-between-the-subwoofer-and-tower-speakers |publisher=Audioholics |first=Gene |last=DellaSala |title=The Marriage Between the Subwoofer and Tower Speakers |date=August 29, 2004 |accessdate=April 24, 2010}}</ref> It allows users to reverse the polarity of the subwoofer relative to the audio signal it is being given. This type of control allows the subwoofer to either be in phase with the source signal, or 180 degrees out of phase.
 
The subwoofer phase can still be changed by moving the subwoofer closer to or further from the listening position, however this may not be always practical.
 
===Servo subwoofers===
Some active subwoofers use a servo feedback mechanism based on cone movement which modifies the signal sent to the voice coil. The servo feedback signal is derived from a comparison of the input signal to the amplifier versus the actual motion of the cone. The usual source of the feedback signal is a few turns of voice coil attached to the cone or a microchip-based [[accelerometer]] placed on the cone itself.<ref>{{cite web |url=http://www.rythmikaudio.com/technology.html |publisher=Rythmik Audio |title=Technology |accessdate=April 24, 2010}}</ref><ref>{{cite web |url=http://cyrille.pinton.free.fr/electroac/lectures_utiles/asservissement/acceleration/SubServoAccelDoucet.pdf |publisher=Analog Devices |last=Doucet |first=Douglas |author2=Rob Fasani |author3=Peter Hasenkamp |author4=Matthew Senesky |title=Using an Accelerometer to Make an Active Subwoofer |accessdate=April 24, 2010}}</ref> An advantage of a well-implemented servo subwoofer design is reduced distortion making smaller enclosure sizes possible.<ref>{{cite web |url=http://www.hometheaterhifi.com/volume_11_2/diy-14-rythmik-directservo-subwoofer-4-2004.html |publisher=Home Theater Hi-Fi |last=Calabria |first=Ralph |title=Rythmik Direct Servo Powered Subwoofer Kit |date=April 2004 |accessdate=April 24, 2010}}</ref> The primary disadvantages are cost and complexity.<ref>{{cite web |url=http://www.ultimateavmag.com/speakersystems/1204velodyne/ |last=Deutsch |first=Robert |publisher=Ultimate AV |title=Velodyne Digital Drive DD-12 subwoofer |date=December 2004 |accessdate=April 24, 2010}}</ref>
 
Servo controlled subwoofers are not the same as [[Servodrive]] subwoofers whose primary mechanism of sound reproduction avoids the normal voice coil and magnet combination in favor of a high-speed belt-driven servomotor. The Servodrive design increases output power, reduces harmonic distortion and virtually eliminates the loss of loudspeaker output that results from an increase in voice coil impedance due to overheating of the voice coil (called ''power compression''.) This feature allows high power operation for extended periods of time.<ref>{{cite web |url=http://www.aes.org/e-lib/browse.cfm?elib=11721 |work=AES E-Library |title=A High Efficiency Servo-Motor Driven Subwoofer |last=Danley |first=Thomas J. |author2=Charles A. Rey |author3=Roy R. Whymark |date=October 1983 |publisher=[[Audio Engineering Society]] |accessdate=April 24, 2010}}</ref><ref>{{cite web |url=http://www.servodrive.com/basstech7.html |archiveurl=http://web.archive.org/web/20080625032125/http://www.servodrive.com/basstech7.html |archivedate=June 25, 2008 |publisher=Servodrive, Inc.; Sound Physics Labs |title=BassTech 7 |accessdate=April 24, 2010}}</ref><ref>{{cite web |url=http://www.aes.org/e-lib/browse.cfm?elib=5023 |work=AES E-Library |title=The Elimination of Power Compression in Servo Drive Loudspeakers |last=Danley |first=Thomas J. |author2=Charles A. Rey |author3=Roy R. Whymark |date=November 1986 |publisher=[[Audio Engineering Society]] |accessdate=April 24, 2010}}</ref> Intersonics was nominated for a [[TEC Award]] for its Servo Drive Loudspeaker (SDL) design in 1986 and for the Bass Tech 7 model in 1990.<ref>{{cite web |url=http://tecfoundation.com/tec/1986.html |title=1986 TEC Awards |publisher=TEC Foundation |accessdate=April 24, 2010}}</ref><ref>{{cite web |url=http://tecfoundation.com/tec/1990.html |title=1990 TEC Awards |publisher=TEC Foundation |accessdate=April 24, 2010}}</ref>
 
==Applications==
===Home audio===
The use of a subwoofer augments the bass capability of the main speakers, and allows them to be smaller without sacrificing low frequency capability. A subwoofer does not necessarily provide superior bass performance in comparison to large conventional loudspeakers on ordinary music recordings due to the typical lack of very low frequency content on such sources. However, there are recordings with substantial low frequency content that most conventional loudspeakers are ill-equipped to handle without the help of a subwoofer, especially at high playback levels, such as music for [[pipe organ]]s with 32' bass pipes (16&nbsp;Hz), very large bass drums on symphony orchestra recordings and electronic music with extremely low [[synth bass]] parts, such as [[bass test]]s or [[bass song]]s.
 
Low frequencies are not easily [[Sound localization|localized]] in small rooms, hence many stereo and multichannel audio systems feature only one subwoofer channel and a single subwoofer can be placed off-center without affecting the perceived sound stage, since the sound produced is difficult to localize. The intention in a system with a subwoofer is often to use small main speakers (of which there are two for stereo and five or more for surround sound or movie tracks) and to hide the subwoofer elsewhere (e.g. behind furniture or under a table), or to augment an existing speaker to save it from having to handle woofer-destroying low frequencies at high levels.
 
Some users add a subwoofer because high levels of low bass are desired, even beyond what is in the original recording, as in the case of [[house music]] enthusiasts. Thus, subwoofers may be part of a package that includes satellite speakers, may be purchased separately, or may be built into the same cabinet as a conventional speaker system. For instance, some floor standing tower speakers include a subwoofer driver in the lower portion of the same cabinet. Physical separation of subwoofer and "satellite" speakers not only allows placement in an inconspicuous location, but since [[sub-bass]] frequencies are particularly sensitive to room location (due to room resonances and reverberation 'modes'), the best position for the subwoofer is not likely to be where the "satellite" speakers are located.
[[File:Bose Acoustimass 5 Series 1.jpg|left|thumb|The 1987 Bose Acoustimass 5 stereo bass driver contained one six-inch (152 mm) driver per channel and provided crossover filtering for its two cube speaker arrays<ref>{{cite web |url=http://products.bose.com/pdf/customer_service/owners/am5_guide.pdf |publisher=Bose |title=Acoustimass 5 user manual |year=1987 |accessdate=April 24, 2010}}</ref>]]
For greatest efficiency and best coupling to the room's air volume, subwoofers can be placed in a corner of the room, far from large room openings, and closer to the listener. This is possible since low bass frequencies have a long [[wavelength]]; hence there is little difference between the information reaching a listener's left and right ears, and so they cannot be readily localized. All low frequency information is sent to the subwoofer. However, unless the sound tracks have been carefully mixed for a single subwoofer channel, it's possible to have some cancellation of low frequencies if bass information in one channel is out of phase with another.
 
The physically separate subwoofer/satellite arrangement has been popularized by multimedia speaker systems such as [[Bose Acoustimass Home Entertainment Systems]], [[Polk Audio]] RM2008 Series and [[Klipsch Audio Technologies]] ProMedia.<ref>{{cite web |url=http://www.polkaudio.com/homeaudio/rm2008/ |publisher=Polk Audio |title=RM Series |accessdate=April 24, 2010}}</ref><ref>{{cite web |url=http://www.klipsch.com/products/details/promedia-ultra-5-1.aspx |publisher=Klipsch |title=ProMedia Ultra 5.1 |accessdate=April 24, 2010}}</ref> Low-cost "[[home theater in a box]]" systems advertise their integration and simplicity.
 
Particularly among low cost "[[Home Theater in a Box]]" systems and with "boom boxes", however, inclusion of a subwoofer may be little more than a marketing device. It is unlikely that a small woofer in an inexpensively-built compact plastic cabinet will have better bass performance than well-designed conventional (and typically larger) speakers in a plywood or MDF cabinet. Mere use of the term "subwoofer" is no guarantee of good or extended bass performance. Many multimedia "subwoofers" might better be termed "bass drivers" as they are too small to produce deep bass.{{fact|date=October 2013}}
 
Further, poorly designed systems often leave everything below about 120&nbsp;Hz (or even higher) to the subwoofer, meaning that the subwoofer handles frequencies which the ear can use for sound source localization, thus introducing an undesirable subwoofer "localization effect". This is usually due to poor crossover designs or choices (too high crossover point or insufficient crossover slope) used in many computer and home theater systems; localization also comes from port noise and from typically large amounts of harmonic distortion in the subwoofer design.{{fact|date=October 2013}} Home subwoofers sold individually usually include [[Audio crossover|crossover]] circuitry to assist integration into an existing system.
 
===Car audio===
[[File:Multiple subwoofers in a car hatchback.jpg|thumb|180px|right| Multiple subwoofers in a car hatchback]]
Automobiles are not well suited for the "hidden" subwoofer approach due to space limitations in the passenger compartments. It is not possible, in most circumstances, to fit such large drivers and enclosures into doors or dashboards, so subwoofers are installed in the trunk or back seat space. Some [[car audio]] enthusiasts compete to produce very high [[Sound#Sound pressure|sound pressure]] levels in the confines of their vehicle's cabin; sometimes dangerously high. The "SPL wars" have drawn much attention to subwoofers in general, but subjective competitions in sound quality ("SQ") have not gained equivalent popularity. Top SPL cars are not able to play normal music, or perhaps even to drive normally as they are designed solely for competition. Many non-competition subwoofers are also capable of generating high levels in cars due to the small volume of a typical car interior. High sound levels can cause hearing loss and [[tinnitus]] if one is exposed to them for an extended period of time.<ref name="pmid10698728">{{cite journal |author=Passchier-Vermeer W, Passchier WF |title=Noise exposure and public health |journal=Environ. Health Perspect. |volume=108 Suppl 1 |issue= Suppl 1|pages=123–131 |year=2000 |pmid=10698728 |doi=10.2307/3454637 |pmc=1637786 |jstor=3454637}}</ref>
 
[[File:Loudspeaker enclosure.jpg|200px|thumb|right|A homemade [[car audio]] subwoofer [[speaker box]] with a 15 inch [[Boss Audio]] subwoofer and an empty space for a second driver]]
In the 2000s, several car audio manufacturers have produced subwoofers using non-circular shapes from manufacturers including Boston Acoustic, Kicker, Sony, Bazooka, and X-Tant. These shapes typically carry some sort of distortion penalties.<ref>{{cite web |url=http://www.autoqna.com/auto-audio/2192-auto-audio-6.html |publisher=AutoQnA |title=Are square subs better or worse than round subs? |accessdate=April 24, 2010}}</ref><ref>{{cite web |url=http://www.polkaudio.com/downloads/12vhndbk.pdf |publisher=Polk Audio |title=Tips, Tweaks and Common Sense About Car Audio |accessdate=April 24, 2010}}</ref><ref>{{cite web |url=http://www.diyaudio.com/forums/showthread.php?threadid=80386 |publisher=diyAudio.com |title=A tricky question from a novice |accessdate=April 24, 2010}} A discussion about non-circular speakers</ref> In situations of limited mounting space they provide a greater cone area and assuming all other variables are constant, greater maximum output. An important factor in the "square sub vs round sub" argument is the effects of the enclosure used. In a sealed enclosure, the maximum displacement is determined by
 
<math>V_\mathrm{d} = x_\mathrm{max} \times S_\mathrm{d}</math>
 
where
* V<sub>d</sub> stands for volume of displacement (in m<sup>3</sup>)
* x<sub>max</sub> to the amount of linear excursion the speaker is mechanically capable of (in m)
* S<sub>d</sub> to the cone area of the sub woofer (in m<sup>2</sup>).
These are some of the [[Thiele/Small]] parameters which can either be measured or found with the driver specifications.
 
===Cinema sound===
After the introduction of Sensurround, [[movie theater]] owners began installing permanent subwoofer systems. [[Dolby Stereo#Dolby Stereo 70 mm Six Track|Dolby Stereo 70 mm Six Track]] was a six channel film sound format introduced in 1976 that used two subwoofer channels for stereo reproduction of low frequencies. In 1981, [[Altec]] introduced a dedicated cinema subwoofer model tuned to 20&nbsp;Hz: the 8182. Starting in 1983, [[THX]] certification of the cinema sound experience quantified the parameters of good audio for watching films, including requirements for subwoofer performance levels and enough isolation from outside sounds so that noise did not interfere with the listening experience.<ref>{{cite web |url=http://www.thx.com/company/index.html |publisher=THX |title=Company Overview |accessdate=April 24, 2010}}</ref> This helped provide guidelines for multiplex cinema owners who wanted to isolate each individual cinema from its neighbors, even as louder subwoofers were making isolation more difficult. Specific cinema subwoofer models appeared from [[JBL]], [[Electro-Voice]], [[Eastern Acoustic Works]], Kintek, [[Meyer Sound Laboratories]] and [[BGW Systems]] in the early 1990s. In 1992, [[Dolby Digital]]'s six-channel film sound format incorporated a single LFE channel, the "point one" in 5.1 surround sound.
 
Tom Horral, a Boston-based acoustician, blames complaints about modern movies being too loud on subwoofers. He says that before subwoofers made it possible to have loud, relatively undistorted bass, movie sound levels were limited by the distortion in less capable systems at low frequency and high levels.<ref>{{cite news |url=http://query.nytimes.com/gst/fullpage.html?res=9A04E1DB1E38F932A05756C0A96E958260&sec=&spon=&pagewanted=all |work=New York Times |first=James |last=Barron |title=Shhhhh! The Audience Is Listening.; When Seeing a Movie Is a Pain in the Ear |date=May 31, 1998 |accessdate=April 24, 2010}}</ref>
 
===Sound reinforcement===
[[File:EAW KF850s + SB1000s (Blacklight Party).jpg|thumb|right|200px|Each stack of speakers in this sound reinforcement setup consists of two EAW SB1000 direct radiating subwoofers (each contains two 18" drivers) and two EAW KF850 full range cabinets for the mid and high frequencies.]]
Professional audio subwoofers must be capable of very high output levels. This is reflected in the design attention given in recent years to the subwoofer applications for sound reinforcement, [[public address systems]], dance club systems and concert systems. Consumer applications (as in home use) are considerably less demanding due to much smaller listening space and lower playback levels. Subwoofers are now almost universal in professional sound applications such as live concert sound, churches, nightclubs, and theme parks. [[Movie theatre]]s certified to the [[THX]] standard for playback always include high capability subwoofers. Some professional applications require subwoofers designed for very high sound levels, using multiple 12", 15", 18" or 21" drivers. Drivers as small as 10" are occasionally used, generally in horn loaded enclosures.
 
The number of subwoofer enclosures used in a concert depends on a number of factors, including the size of the venue, whether it is indoors or outdoors, the amount of low-frequency content in the band's sound, the desired volume of the concert, and the design and construction of the enclosures (e.g., direct-radiating versus horn-loaded. A small bar may use a single direct-radiating 15-inch sub cabinet. A large dance club may have a row of four or five twin 18-inch subwoofer cabinets, or more). In the largest stadium venues, there may be a very large number of subwoofer enclosures. For example, the 2009–2010 [[U2 360° Tour]] uses 24 Clair Brothers BT-218 subwoofers (a double 18" box) around the perimeter of the central circular stage, and 72 proprietary Clair Brothers cardioid S4 subwoofers placed underneath the ring-shaped "B" stage which encircles the central main stage.<ref>{{cite web |publisher=Clair Global |url=http://clairglobal.com/u2/ |title=Backstage Pass: U2 360° |accessdate=January 12, 2010}}</ref><ref>{{cite web |last=Becka |first=Kevin |date=December 1, 2009 |url=http://mixonline.com/live/tourprofiles/u2-tour-profile-1209/index1.html |title=U2 360 Tour Profile: Seeking Intimacy on a Grand Scale |page=2 |work=Mix |publisher=Penton Media |accessdate=January 12, 2010}}</ref>
 
The main speakers may be 'flown' from the ceiling of a venue on chain hoists, and 'flying points' (i.e., attachment points) are built into many professional loudspeaker enclosures. Subwoofers can be flown or stacked on the ground near the stage. There can be more than 50 double-18-inch cabinets in a typical concert system. Just as consumer subwoofer enclosures can be made of [[Medium-density fibreboard]] (MDF), [[Oriented strand board]] (OSB), [[plywood]], plastic or other dense material, professional subwoofer enclosures can be built from the same materials.<ref>{{cite web |url=http://www.speakercity.com/Merchant2/merchant.mvc?Screen=CTGY&Store_Code=SC&Category_Code=Article |publisher=Speaker City |first=Bob |last=Wayland |work=American Woodworker |title=Spectacular Speakers |accessdate=April 24, 2010}}</ref><ref>{{cite web |url=http://www.altecpro.com/pdfs/vintage/SpeakerAndMics/systems/9880-8A%20LF%20Speaker%20System.pdf |publisher=Altec-Lansing |title=9880-8A 18" Subwoofer |accessdate=April 24, 2010}}</ref> MDF is commonly used to construct subwoofers for permanent installations as its density is relatively high and weatherproofing is not a concern. Other permanent installation subwoofers have used very thick plywood: the [[Altec]] 8182 (1981) used 7-ply 28&nbsp;mm birch-faced oak plywood.<ref>{{cite web |url=http://www.altecpro.com/pdfs/vintage/SpeakerAndMics/systems/8000%20Series%20LF%20Speaker%20Systems.pdf |publisher=Altec-Lansing |title=8000 Series Loudspeaker Systems |accessdate=April 24, 2010}}</ref> Touring subwoofers are typically built from 18–20&nbsp;mm thick void-free Baltic birch ([[Betula pendula]] or [[Betula pubescens]]) plywood from Finland, Estonia or Russia; such plywood affords greater strength for frequently transported enclosures.<ref>{{cite web |url=http://www.jblpro.com/pub/manuals/enclgde.pdf |publisher=JBL Professional Audio |title=JBL Professional Enclosure Guide |accessdate=April 24, 2010}}</ref> Not naturally weatherproof, Baltic birch is coated with carpet, thick paint or spray-on [[truck bedliner]] to give the subwoofer enclosures greater durability.<ref>{{cite web |url=http://www.jtrspeakers.com/ |publisher=JTR |title=Growler with Line-X coating |accessdate=April 24, 2010}}</ref><ref>{{cite web |url=http://www.solid-nrg.com/ds1802sq.htm |publisher=Solid-NRG |title=DS-1802SQ with Line-X coating |accessdate=April 24, 2010}}</ref>
 
Touring subwoofer cabinets are typically designed with features that facilitate moving the enclosure (e.g., wheels, a "towel bar" handle and recessed handles), a protective grill for the speaker (in direct radiating-style cabinets), metal or plastic protection for the cabinets to protect the finish as the cabinets are being slid one on top of another, and hardware to facilitate stacking the cabinets (e.g., interlocking corners) and for "flying" the cabinets from stage rigging.
 
====Full-range system====
In professional concert sound system design, subwoofers can be incorporated seamlessly with the main speakers into a stereo or mono full-range system by using an active [[Audio crossover|crossover]]. Such a system receives its signal from the main mono or stereo [[mixing console]] mix bus and amplifies all frequencies together in the desired balance. If the main sound system is stereo, the subwoofers can also be in stereo. Otherwise, a mono subwoofer channel can be derived within the crossover from a stereo mix, depending on the crossover make and model.
 
====Aux-fed subwoofers====
Instead of being incorporated into a full-range system, concert subwoofers can be supplied with their own signal from a separate mix bus on the mixing console; often one of the auxiliary sends ("aux" or "auxes") is used. This configuration is called "aux-fed subwoofers", and has been observed to significantly reduce low frequency "muddiness" that can build up in a concert sound system which has on stage a number of microphones each picking up low frequencies and each having different phase relationships of those low frequencies.<ref name=Young2008/> The aux-fed subs method greatly reduces the number of sources feeding the subwoofers to include only those instruments that have desired low frequency information; sources such as [[bass drum|kick drum]], [[bass guitar]], [[Sampler (musical instrument)|samplers]] and [[Keyboard instrument|keys]]. This simplifies the signal sent to the subwoofers and makes for greater clarity and low punch.<ref>{{cite web |url=http://peavey.com/support/technotes/concepts/AUX_SUBs.pdf |publisher=Peavey |first=Don |last=Boomer |title=Aux Fed Subs |accessdate=April 24, 2010}}</ref> Aux-fed subs can even be stereo, if desired, using two auxiliary mix buses.
 
====Directional bass====
[[File:Cardioid Subwoofers.png|thumb|Cardioid dispersion pattern of two end-fire subwoofers placed one in front of the other. The enclosure nearest the listener is delayed by a few milliseconds.<ref>Cardioid subwoofer image: The second subwoofer has been delayed a precise amount corresponding to the time it takes sound to traverse the distance between speaker grilles. Image captured from [[Electro-Voice]]'s RACE loudspeaker pattern prediction software. Frequency shown is 60&nbsp;Hz.</ref>]]
In order to keep low frequency energy focused on the audience area and not on the stage, and to keep low frequencies from bothering people outside of the event space, a variety of techniques have been developed in concert sound to turn the naturally omnidirectional radiation of subwoofers into a more directional pattern. These techniques include setting up subwoofers in a vertical array; using combinations of delay and polarity inversion; and setting up a delay-shaded system.
 
=====Vertical array=====
Stacking or [[Rigging (theatre)|rigging]] the subwoofers in a vertical array focuses the low frequencies forward to a greater or lesser extent depending on the physical length of the array. Longer arrays have a more directional effect at lower frequencies. The directionality is more pronounced in the vertical dimension, yielding a radiation pattern that is wide but not tall. This helps reduce the amount of low frequency sound bouncing off the ceiling indoors and assists in mitigating external noise complaints outdoors.
 
=====Rear delay array=====
[[File:Cardioid Subwoofer Array.png|thumb|upright|CSA: Six subwoofers arranged for less bass energy on stage. Signal going to the reversed enclosures is delayed a few milliseconds.]]
Another cardioid subwoofer array pattern can be used horizontally, one which takes few channels of processing and no change in required physical space. This method is often called "cardioid subwoofer array" or "CSA"<ref name=CSA>{{cite web|url=http://www.nordic.dk/_en-GB-II/Content/Data/PDF%20og%20andre%20filer/PDF/Download%20center/Lydafdelingen/d&bTI-330.pdf |title=Cardioid Subwoofer Array – CSA |date=January 2004 |work=Technical Information |number=330 |publisher=D&B Audiotechnik |accessdate=28 April 2010|location=Backnang, Germany }}</ref> even though the pattern of ''all'' directional subwoofer methods is cardioid. The CSA method reverses the enclosure orientation and inverts the polarity of one out of every three subwoofers across the front of the stage, and delays those enclosures for maximum cancellation of the target frequency on stage. Polarity inversion can be implemented electronically, by reversing the wiring polarity, or by physically positioning the enclosure to face rearward. This method reduces forward output relative to a tight-packed, flat-fronted array of subwoofers, but can solve problems of unwanted low frequency energy coming into microphones on stage. Compared to the end-fire array, this method has less on-axis energy but more even pattern control throughout the audience, and more predictable cancellation rearward. The effect spans a range of slightly more than one octave.<ref name=CSA/>
 
A second method of rear delay array combines end-fire topology with polarity reversal, using two subwoofers positioned front to back, the drivers spaced one-quarter wavelength apart, the rear enclosure inverted in polarity and delayed by a few milliseconds for maximum cancellation on stage of the target frequency.<ref>{{cite web|url=http://www.tigeraudioinc.com/endfire2.jpg |title=2 Deep End Fire: Alternative Method |last=Brill |first=Harry, Jr. |publisher=Tiger Audio |accessdate=April 28, 2010}}</ref> This method has the least output power directed toward the audience, compared to other directional methods.
{{clear}}
 
=====End-fire array=====
[[File:End-fire Subwoofer Array.png|thumb|upright|End-fire array using three rows of subwoofers. Each row is delayed a few milliseconds more than the previous row.]]
The end-fire subwoofer method, also called "forward steered arrays",<ref name=ForwardSteered>{{cite web|url=http://www.jblpro.com/catalog/support/getfile.aspx?docid=272&doctype=3 |title=Forward Steered Arrays in Precision Directivity Speaker Systems |date=August 28, 2001 |work=Technical Notes |volume=1 |number=28 |publisher=JBL Professional Audio |accessdate=April 28, 2010|location=Northridge, California }}</ref> places subwoofer drivers co-axially in one or more rows, using destructive interference to reduce emissions to the sides and rear. This can be done with separate subwoofer enclosures positioned front to back with a spacing between them of one-quarter wavelength of the target frequency, the frequency that is least wanted on stage or most desired in the audience. Each row is delayed beyond the first row by an amount related to the speed of sound in air; typically a few milliseconds. The arrival time of sound energy from all the subwoofers is near-simultaneous from the audience's perspective, but is canceled out to a large degree behind the subwoofers because of offset sound wave arrival times. Directionality of the target frequency can achieve as much as 25 dB rear attenuation, and the forward sound is coherently summed in line with the subwoofers.<ref name=Kamlet2004>{{cite web |url=http://www.jblpro.com/pages/install/Spaced%20SB210%20FSA%20Forward%20Steered%20Bass%20Array.pdf |title=Spaced SB210 FSA Forward Steered Low-Bass Array |first=Rick |last=Kamlet |date=January 2004 |accessdate=April 24, 2010}}</ref> The positional technique of end-fire subwoofers came into widespread use in European live concert sound in 2006.<ref>{{cite web |url=http://barking.roaddog.com/2006/07 |first=Dave |last=Stevens |work=A Barking Dog. |date=July 18, 2006 |title=Pinging In From ES and Gear Notes Rotterdam, Wuppertal and Finkenstein |accessdate=April 24, 2010}}</ref>
 
The end-fire array trades a few decibels of output power for directionality, so it requires more enclosures for the same output power as a tight-packed, flat-fronted array of enclosures. Sixteen enclosures in four rows were used in 2007 at one of the stages of the [[Ultra Music Festival]], to reduce low frequency interference to neighboring stages.<ref>{{cite web|url=http://picasaweb.google.com/HBrillJr/UltraFest2007a#5046282798683396738 |title=Pic 3 of 500 |last=Brill |first=Harry, Jr. |date=March 23, 2007 |work=UltraFest2007a |publisher=Picasa |accessdate=April 28, 2010 }}</ref> Because of the physical size of the end-fire array, few concert venues are able to implement it. The output pattern suffers from comb-filtering off-axis, but can be further shaped by adjusting the frequency response of each row of subwoofers.<ref name=ForwardSteered/>
{{clear}}
 
=====Delay-shaded array=====
A long line of subwoofers placed horizontally along the front edge of the stage can be delayed such that the center subs fire several milliseconds prior to the ones flanking them, which fire several milliseconds prior to ''their'' neighbors, continuing in this fashion until the last subwoofers are reached at the outside ends of the subwoofer row ([[beamforming]]). This method helps to counteract the extreme narrowing of horizontal dispersion pattern seen with a horizontal subwoofer array. Such delay shading can be used to virtually reshape a loudspeaker array.<ref>{{cite web |url=http://www.qscaudio.com/products/dsp/SC28/intrinsic_correction_whitepaper_2007.pdf |publisher=[[QSC Audio]] |first=Mark |last=Engebretson |title=Advanced Loudspeaker Tuning Techniques. QSC Intrinsic Correction |year=2007 |accessdate=April 24, 2010}}</ref>
 
=====Directional enclosure=====
Some subwoofer enclosure designs rely on drivers facing to the sides or to the rear in order to achieve a degree of directionality.<ref>{{cite web |url=http://pro-light-news.com/html/16/e60419ne.htm |title=Nexo Geo-D subwoofer |accessdate=April 24, 2010}}</ref><ref>{{cite web |url=http://www.meyersound.com/products/concertseries/psw-6/ |publisher=[[Meyer Sound Laboratories]] |title=PSW-6: High-Power Cardioid Subwoofer |accessdate=April 24, 2010}}</ref> End-fire drivers can be positioned within a single enclosure that houses more than one driver.<ref>{{cite web |url=http://www.adraudio.com/Products/ATA218C.html |publisher=[[ADRaudio]] |title=ATA 218C HH directional subwoofer |accessdate=April 24, 2010}}</ref>
 
===Bass instrument amplification===
In rare cases, sound reinforcement subwoofer enclosures are also used for [[bass instrument amplification]] by [[electric bass]] players and [[synth bass]] players. For most bands and most small- to mid-size venues (e.g., nightclubs and bars), standard bass guitar speaker enclosures or keyboard amplifiers will provide sufficient sound pressure levels for onstage monitoring. Since a regular electric bass has a low "E" (41&nbsp;Hz) as its lowest note, most standard bass guitar cabinets are only designed with a range that goes down to about 40&nbsp;Hz. However, in some cases, performers wish to have extended sub-bass response that is not available from standard instrument speaker enclosures, so they use subwoofer cabinets. Just as some electric guitarists add huge stacks of guitar cabinets mainly for show, some bassists will add immense subwoofer cabinets with 18" woofers mainly for show, and the extension sub cabinets will be operated at a lower volume than the main bass cabinets.
 
Bass guitar players who may use subwoofer cabinets include performers who play with extended range basses that include a low "B" string (about 31&nbsp;Hz); bassists who play in styles where a very powerful sub-bass response is an important part of the sound (e.g., funk, Latin, gospel, R & B, etc.); and/or bass players who perform in stadium-size venues or large outdoor venues.  Keyboard players who use subwoofers for on-stage monitoring include [[Hammond organ|electric organ]] players who use bass [[pedal keyboard]]s (which go down to a low "C" which is about 33&nbsp;Hz) and synth bass players who play rumbling sub-bass parts that go as low as 18&nbsp;Hz. Of all of the keyboard instruments that are amplified onstage, synthesizers can produce some of the lowest pitches, because unlike a traditional electric piano or electric organ, which have as their lowest notes a low "A" and a low "C", respectively, a synth does not have a fixed lowest octave. A synth player can add lower octaves to a patch by pressing an "octave down" button, which can produce pitches that are at the limits of human hearing.
 
Several concert sound subwoofer manufacturers suggest that their subs can be used for bass instrument amplification. Meyer Sound suggests that its 650-R2 Concert Series Subwoofer, a {{convert|14|sqft|adj=on}} enclosure with two 18-inch drivers, can be used for bass instrument amplification.<ref>{{cite web |url=http://www.meyersound.com/products/legacy/650r2/index.htm |publisher=[[Meyer Sound Laboratories]] |title=650R2 Subwoofer |accessdate=April 24, 2010}}</ref> While performers who use concert sound subwoofers for onstage monitoring may like the powerful sub-bass sound that they get onstage, sound engineers may find the use of large subwoofers (e.g., two 18" drivers) for onstage instrument monitoring to be problematic, because it may interfere with the "Front of House" sub-bass sound.
 
==Bass shakers==
Since much very low bass is felt, sub-bass can be augmented using [[tactile transducers]]. Unlike a typical subwoofer driver, which produces audible vibrations, tactile transducers produce low-frequency vibrations that are designed to be felt by individuals who are touching the transducer or indirectly through a piece of furniture or a wooden floor. Tactile transducers have recently emerged as a device class, called variously "bass shakers", "butt shakers" and "throne shakers". They are attached to a seat, for instance a drummer's stool ("throne") or gamer's chair, car seat or home theater seating, and the vibrations of the driver are transmitted to the body then to the ear in a manner similar to [[bone conduction]].<ref>{{cite web |url=http://www.oreilly.com/catalog/htheaterhks/ |publisher=O'Reilly |year=2004 |first=Brett |last=McLaughlin |title=Home Theater Hacks: 100 Industrial-Strength Tips & Tools |accessdate=April 24, 2010}}</ref><ref>{{cite web |url=http://hometheater.about.com/cs/loudspeakers/a/aasubwoofera_3.htm |publisher=Home Theater |first=Robert |last=Silva |title=Subwoofers: What You Need To Know; Subwoofer Alternatives |page=3 |accessdate=April 24, 2010}}</ref> They connect to an amplifier like a normal subwoofer. They can be attached to a large flat surface (for instance a floor or platform) to create a large low frequency conduction area, although the transmission of low frequencies through the feet is not as efficient as the seat.<ref>{{cite web |url=http://www.hometheaterhifi.com/volume_9_2/buttkicker-two-6-2002.html |publisher=Home Theater Hi-Fi |date=June 2002 |first=Evan |last=Upchurch |title=ButtKicker 2 Low Frequency Shaker |accessdate=April 24, 2010}}</ref>
 
The advantage of tactile transducers used for low frequencies is that they allow a listening environment that is not filled with loud low frequency waves. This helps the concert drummer to monitor his or her kick drum performance without "polluting" the stage with powerful low frequency waves from a 15" subwoofer monitor. By not having a subwoofer monitor, a bass shaker also enables a drummer to lower the sound pressure levels that he is exposed to during a performance. For home cinema or videogame use, bass shakers help the user avoid disturbing others in nearby apartments or rooms, because even powerful sound effects such as explosion sounds in a war videogame or the simulated rumbling of an earthquake in an adventure film will not be heard by others. However, some critics argue that the felt vibrations are disconnected from the auditory experience, and they claim that that music is less satisfying with the "butt shaker" than sound effects. As well, critics have claimed that the bass shaker itself can rattle during loud sound effects, which can distract the listener.<ref name="Extremet">{{cite web|url=http://www.extremetech.com/article2/0,1697,1857002,00.asp|title=Buttkicker Gamer Review|publisher=ExtremeTech|date=8 September 2005|last=Atkinson|first=Jeremy|accessdate=12 April 2010}}</ref>
 
==World record claims==
With varying measures upon which to base claims, several subwoofers have been said to be the world's largest, loudest or lowest.
 
===Matterhorn===
The Matterhorn is a subwoofer model completed in March 2007 by Danley Sound Labs in [[Gainesville, Georgia]] after a U.S. military request for a loudspeaker that could project infrasonic waves over a distance. The Matterhorn was designed to reproduce a continuous sine wave from 15 to 20&nbsp;Hz, and generate 94&nbsp;dB at a distance of {{convert|250|m|sp=us}}, and more than 140&nbsp;dB for music playback measured at the horn mouth.<ref name=broadcast>{{cite journal |work=Broadcast Engineering |date=March 10, 2007 |url=http://broadcastengineering.com/audio/danley-matterhorn-nsca/ |title=Danley brings the Matterhorn to NSCA |accessdate=December 10, 2009}}</ref> It can generate a constant 15&nbsp;Hz sine wave tone at 140&nbsp;dB for 24 hours a day, seven days a week with extremely low harmonic distortion. The subwoofer has a flat frequency response from 15 to 80&nbsp;Hz, and is down 3&nbsp;dB at 12&nbsp;Hz.<ref>{{cite journal |work=L&Si Online |date=February 21, 2007 |url=http://www.lsionline.co.uk/news/?K2VG9F |title=Danley's Matterhorn at NSCA |accessdate=December 10, 2009}}</ref> It was built within an [[intermodal container]] {{convert|20|ft}} long and {{convert|8|x|8|ft}} square.<ref name=Matterhorn/> The container doors swing open to reveal a [[tapped horn]] driven by 40 long-throw 15-inch MTX speaker drivers each powered by its own 1000-watt amplifier.<ref name=MatterhornPDF>{{cite web |publisher=Danley Sound Labs |url=http://www.danleysoundlabs.com/pdf/old/matterhorn%20pdf.pdf |title=Matterhorn Fact Sheet |accessdate=December 10, 2009}}</ref><ref>{{cite web|url=http://www.danleysoundlabs.com/danleyport.asp?ID=33 |title=Photos from NSCA 2007 |work=Portfolio |publisher=Danley Sound Labs |accessdate=March 31, 2010}}</ref> The manufacturer claims that 53 13-ply 18&nbsp;mm {{convert|4|x|8|ft|adj=on}} sheets of plywood were used in its construction,<ref name=MatterhornPDF/> though one of the fabricators wrote that double-thickness 26-ply sheets were used for convenience.<ref>{{cite web |last=Beaver |first=Ivan |publisher=ProSoundWeb |work=LAB Lounge discussion forum |url=http://srforums.prosoundweb.com/index.php/m/281504/30055/0///72/#msg_281504 |title=Re: 13 Ply Baltic Birch. Message #281504 |date=January 12, 2008 |accessdate=December 10, 2009}}</ref>
 
A [[diesel generator]] is housed within the enclosure to supply electricity when external power is unavailable.<ref name=Matterhorn>{{cite web |publisher=Danley Sound Labs |url=http://www.danleysoundlabs.com/matterhorn.htm |title=Matterhorn |accessdate=December 10, 2009}}</ref> Of the constant tone output capability, designer Tom Danley wrote that the "target 94&nbsp;dB at 250 meters is not the essentially fictional 'burst' or 'peak SPL' nonsense in pro sound, or like the 'death burp' signal used in car sound contests."<ref name=Danley2007March>{{cite web |last=Danley |first=Tom |publisher=ProSoundWeb |work=LAB Subwoofer discussion forum |url=http://srforums.prosoundweb.com/index.php/mv/msg/20851/0/40/72/ |title=Re: Here you go then! Message #197255 |date=March 18, 2007 |accessdate=December 10, 2009}}</ref> At the annual [[National Systems Contractors Association]] (NSCA) convention in March 2007, the Matterhorn was barred from making any loud demonstrations of its power because of concerns about damaging the building of the [[Orange County Convention Center]].<ref name=broadcast/> Instead, using only a single 20 amp electrical circuit for safety, visitors were allowed to step inside the horn of the subwoofer for an "acoustic massage" as the fractionally powered Matterhorn reproduced low level 10–15&nbsp;Hz waves.
 
===Royal Device custom installation===
Another subwoofer claimed to be the world's biggest is a custom installation in Italy made by Royal Device primarily of bricks, concrete and sound-deadening material<ref name=Gordon2008>{{cite journal |last=Jones |first=Gordon |work=Electronic House |date=July 16, 2008 |url=http://www.electronichouse.com/article/the_worlds_largest_subwoofer/ |title=The World's Largest Subwoofer? |accessdate=December 11, 2009}}</ref> consisting of two subwoofers embedded in the foundation of a listening room.<ref name=RoyalDevice>{{cite web |publisher=Royal Device |url=http://www.royaldevice.com/custom.htm |title=Custom |accessdate=December 10, 2009}}</ref> The horn-loaded subwoofers each have a floor mouth that is {{convert|2.2|m2|sp=us}}, and a horn length that is {{convert|9.5|m|sp=us}}, in a cavity {{convert|1|m|sp=us}} under the floor of the listening room. Each subwoofer is driven by eight 18-inch subwoofer drivers with {{convert|100|mm|sp=us}} voice coils. The designers assert that the floor mouths of the horns are additionally loaded acoustically by a vertical wooden horn expansion and the room's ceiling to create a 10&nbsp;Hz "full power" wave at the listening position.<ref name=RoyalDevice/>
 
===Concept Design 60-inch===
A single {{convert|60|in|adj=on}} diameter subwoofer driver was designed by Richard Clark and David Navone with the help of Dr. Eugene Patronis of the [[Georgia Institute of Technology]]. The driver was intended to break sound pressure level records when mounted in a road vehicle, calculated to be able to achieve more than 180&nbsp;dBSPL. It was built in 1997, driven by DC motors connected to a rotary crankshaft somewhat like in a [[piston engine]]. The cone diameter was {{convert|54|in}} and was held in place with a {{convert|3|in|adj=on}} surround. With a {{convert|6|in|adj=on}} peak-to-peak stroke, it created a one-way air displacement of {{convert|6871|in3}}.<ref name=Techzone/> It was capable of generating 5–20&nbsp;Hz sine waves at various DC motor speeds—not as a response to audio signal—it could not play music. The driver was mounted in a [[stepvan]] owned by Tim Maynor but was too powerful for the amount of applied reinforcement and damaged the vehicle.<ref name=Techzone>{{cite web |last=Eldridge |first=Mark |publisher=The Techzone.com |date=February 24, 2006 |archiveurl=http://web.archive.org/web/20060304061733/http://www.thetechzone.com/photo/computers.php?photo=13813 |url=http://www.thetechzone.com/photo/computers.php?photo=13813 |archivedate=March 4, 2006 |title=60-inch Subwoofer |accessdate=December 11, 2009}}</ref> MTX's [[Loyd Ivey]] helped underwrite the project and the driver was then called the MTX "Thunder 1000000" (one million).<ref>{{cite web |publisher=Audio Forum |url=http://audioforum.termpro.com/topic/40/23776.html |title=Topic: 60 Inch Sub – Richard Clark – David Navone |first=Johnathan |last=Demuth |date=May 21, 2008 |accessdate=December 11, 2009}}</ref>
 
Still unfinished, the vehicle was entered in an SPL competition in 1997 at which a complaint was lodged against the computer control of the DC motor. Instead of using the controller, two leads were touched together in the hope that the motor speed was set correctly. The drive shaft broke after one positive stroke which created an interior pressure wave of 162&nbsp;dB. The Concept Design 60-inch was not shown in public after 1998.<ref>{{cite web |publisher=All About Cars |url=http://allaboutrides.blogspot.com/2007/03/worlds-biggest-subwoofer.html |title=The world's biggest subwoofer |accessdate=April 24, 2010}} Reposted version of the Techzone article.</ref>
 
===MTX Jackhammer===
The largest production subwoofer intended for use in automobiles is the MTX Jackhammer by [[MTX Audio]] which has a {{convert|22|in|adj=on}} diameter cone. The Jackhammer can take a total of 6000 watts sent to dual voice coils moving within a {{convert|900|oz|kg|adj=on}} strontium ferrite magnet. The Jackhammer weighs {{convert|369|lb}} and has an aluminum [[heat sink]].<ref name=Jackhammer>{{cite web |publisher=MTX Audio |url=http://www.mtx.com/caraudio/products/subwoofers/jackHammer.cfm |title=Jackhammer |accessdate=December 11, 2009}}</ref> The Jackhammer has been featured on the television show [[Pimp My Ride]].<ref>{{cite web |publisher=Ebaumsworld; Digg |url=http://www.ebaumsworld.com/video/watch/1015580/ |title=Biggest Subwoofer in a Car: MTV's Pimp My Ride... a little over the top |accessdate=December 11, 2009}}</ref>
 
==See also==
{{Commons}}
{{colbegin|3}}
*[[Bass management]]
*[[Bass test]]
*[[Bass song]]
*[[Mid-range speaker]]
*[[Super Tweeter]]
*[[Rotary Woofer]]
*[[Thiele/Small]]
*[[Tweeter]]
*[[Woofer]]
{{colend}}
 
==References==
{{Reflist|colwidth=30em}}
 
{{Good article}}
 
[[Category:Loudspeakers]]
[[Category:In-car entertainment]]
[[Category:Audio engineering]]
[[Category:Film and video technology]]
[[Category:Bass (sound)]]
[[Category:Loudspeaker technology]]

Latest revision as of 16:30, 2 January 2015

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Faites-le pour l'amour de l'intégrité de la science. Si j'avais pris le vendeur à sa parole, j'aurais perdu une quantité considérable d'argent sur la transaction. J'ai d'abord commencé à utiliser du corps Tingle il ya 30 ans à la moitié de la force (10%) et ensuite allé à pleine puissance (20%). Il ressemble à un blog, mais il est ouvert à des postes de quiconque, y compris les travaux d'écrou qui peuplent le paysage de W3.

Cette approche peut avoir reflété sa pratique dans le Nike Free Haven 3.0 secteur des services, mais ce n'est pas la façon dont je mène mes affaires. Il devrait peut-être lire propres commentaires de TripAdvisor sur la vérification de l'authenticité avant qu'il montre son ignorance grossière.

Nous ne pouvons pas garantir votre satisfaction à des produits ou des services qui sont disponibles via un site tiers qui relie ou est lié aux SITES scentsy parce que ces sites tiers sont détenus et exploités par des entités indépendantes. Nous ne soutenons aucun des produits ou services, et nous n'avons pris aucune mesure pour confirmer l'exactitude ou la fiabilité de toute l'information, mis à disposition par des sites tiers..

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