Editing Subwoofer (section)

==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="TVTechnology" /> 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 100&nbsp;Hz, and is down 3&nbsp;dB at 12&nbsp;Hz.<ref name=Matterhorn2007 /> It was built within an [[intermodal container]] {{convert|20|ft|sp=us}} long and {{convert|8|x|8|ft|sp=us}} square.<ref name="Matterhorn" /> The container doors swing open to reveal a [[tapped horn]] driven by 40 long-throw 15-inch (40&nbsp;cm) MTX speaker drivers each powered by its own 1000-watt amplifier.<ref name="MatterhornPDF" /><ref name=PhotosFromNSCA /> The manufacturer claims that 53 13-ply 18&nbsp;mm {{convert|4|x|8|ft|adj=on|sp=us}} 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.{{Citation needed|date=June 2023}}

A [[diesel generator]] is housed within the enclosure to supply electricity when external power is unavailable.<ref name="Matterhorn" /> 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="TVTechnology"/> 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.{{Citation needed|date=June 2023}}

===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 /> consisting of two subwoofers embedded in the foundation of a listening room.<ref name=RoyalDevice /> 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.

===Concept Design 60-inch===
A single {{convert|60|in|adj=on|sp=us}} diameter subwoofer driver was designed by Richard Clark and David Navone with the help of 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|sp=us}} and was held in place with a {{convert|3|in|adj=on|sp=us}} surround. With a {{convert|6|in|adj=on|sp=us}} peak-to-peak stroke, it created a one-way air displacement of {{convert|6871|in3|sp=us}}.<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"/> MTX's [[Loyd Ivey]] helped underwrite the project and the driver was then called the MTX "Thunder 1000000" (one million).{{Citation needed|date=June 2023}}

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 name=TWBS />

===MTX Jackhammer===
The heaviest production subwoofer intended for use in automobiles is the MTX Jackhammer by [[MTX Audio]], which features a {{convert|22|in|adj=on|sp=us}} diameter cone. The Jackhammer has been known to take upwards of 6000 watts sent to a dual voice coil moving within a {{convert|900|oz|kg|adj=on|sp=us}} strontium ferrite magnet. The Jackhammer weighs in at {{convert|369|lb|sp=us}} and has an aluminum [[heat sink]].<ref name=Jackhammer /> The Jackhammer has been featured on the [[reality TV]] show ''[[Pimp My Ride]]''.{{Citation needed|date=June 2023}}