Editing Subwoofer (section)

===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 />