Hi SpockTheater,

It's the laws of physics come into play in subwoofer design. If you want really deep bass and huge output, you have to use either a big enclosure and large driver OR you can get very low frequencies from a much smaller enclosure but you must use a huge amplifier (1,000 watts or more) and a long-excursion driver with an enormous magnet. That's what Sunfire does to get 17-Hz frequencies from its 9-inch cube. It's $1,500 and will have limits on maximum output.

Regards,

Alan Lofft,
Axiom Resident Expert (Retired)