Sound Off Legends Richard Clark and David Navone With 60" Sub
Actually, before designing it, we looked at a comparison between a large number of conventional subwoofers, or a single giant one. After we did the math, the obvious choice was the one giant woofer. It’s output displacement is comparable to 160+ ten inch woofers. It can move a lot of air!
The cone moves 6 inches peak to peak under full-tilt output.
The actual cone diameter is 54 inches, with the 3 inch wide surround on the outside of that. The radiating surface area is 2,290 square inches. That yields a one way displacement of 6,871 cubic inches. That is equivalent to the displacement of 161 ten inch woofers that move 1.5 inches peak to peak.
The motor is capable of producing 6,000+ pounds of linear force, which is necessary when considering the very large surface area and displacement volume required to produce high SPL levels.
The woofer was designed with the capability to produce SPL levels of 188 dB, which are entirely possible, given an appropriately built vehicle. It is simply a matter of displacement and containment.
^ They haven’t played it at max volume. From the article, 180dB looks to be more of a theoretical estimate. I’m guessing they havent tried the max SPL on account of the sheer power the speaker produces - it would most likely damage any box/container that the speaker is placed in.
They did mention that it hit a 162dB volume at a contest before the speaker motor snapped. The current model is an updated model which fixes that issue.
The very first set up of the RD Audio Room - Compression Chamber finally closed and covered with nearly 1 ton of marble. http://www.royaldevice.com/36a.jpg
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if this goes on sale then only one warning will be left beware of rock bands 
But thats absolutely without any distortion.
