I read an article once about a company that invented a "rotary subwoofer" (link below, if you want to see it) that actually uses your entire attic as a baffle.

I read an article once about a company that invented a "rotary subwoofer" (link below, if you want to see it) that actually uses your entire attic as a baffle. It seems that because they don't use a cone, they can actually get down to something like 1-3Hz...though I'd think you'd feel that more than you'd hear it. http://www.rotarywoofer.com/ http://www.rotarywoofer.com/