We all know subwoofers make bass. Big subwoofers, like the $799 Epik Empire, can sport massive 15-inch woofers and a Class D 600-watt power amplifier, all packaged in a 22x18x24-cabinet. The Empire's 120-pound weight might be a not-so-subtle indication that it's solidly built.
But Eminent Technology's TRW-17 Rotary Woofer ($12,900) doesn't have a cone-type woofer or a box or cabinet. No, the TRW-17 looks like a high-tech fan. And when you turn it on, the fan's blade spins just like a fan, but it's a bona-fide subwoofer. It produces deeper and more powerful bass than any conventional subwoofer I've ever heard. Everybody who hears the TRW-17 is shocked by its power to produce a truly visceral experience.
The TRW-17's fluttering blades generate bass frequencies down to 1 hertz (standard $1,000 subs poop out in the 30Hz range, and ultra high-end subs rarely make it below 18Hz.). The Eminent Technology Web site provides more information about how the blades produce bass.
The TRW-17 subwoofer is powerful enough to make an entire room throb with bass energy. TRW-17 installations are complex and can easily run to $25,000. For home audio, the TRW-17 is typically mounted in an attic, basement, or side room so the spinning blades are always out of reach of small children and pets.
The TRW-17 mounted in a typical installation.
(Credit: Eminent Technology) 
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