If you are one of those people always trying to get a little more gut thumpinig bass out of your audio system, you might consider the Model 17 from Eminent Technology. This beast does not even have an enclosure. It just uses your house.
Want to hear what 5Hz sounds like? A new woofer technology unlike any other and a new product category for home audio. This is the first home audio woofer delivering true response to DC. The Thigpen rotary woofer is the worlds first true infrasonic home audio or home theater woofer.
I particularly like this little note on installation:
Note, the model 17 must be professionally installed in an attic or basement which becomes an infinite baffle. The price [$12,900] includes the driver, enclosure, baffling, filters, motor, motor speed controller, motor mounting bracket and installation instructions. The amplifier should be capable of operating near its rated power at between 1 and 3 Hz.
Now I just have to hope that David doesn’t scrape together his pennies and install one when I’m not looking. 
