Now here's something I wouldn't mind having.
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Invincible 21.1 by YG Acoustics redefines the subwoofer: it is the world’s first hyper-high-end sub-bass speaker.
www.yg-acoustics.com
Two 21" drivers, 6000 watts. Sealed design. 462 lbs. And for $100K you can own it. They're actually modular and they do sell them as single downfiring versions too. The drivers are machined from aircraft-grade billet aluminum and only weigh 14.5 oz. This thing looks like a beast, tho specs are kinda vague. "Truly full output (-0 dB), even anechoically, to below 20 Hz. Usable output extends below 15 Hz". With two 21" drivers and gobs of power I can believe it'll hit at least 20 hz without much trouble.