i believe hsu designs the outlaw sub (haven't heard the outlaw, but the hsu is really good). also check out martin logan dynamo.
sleeper small subs stereo application
Contemplating Hsu stf 1 for 2 channel enviroment...no HT deep bass needed...is this the frontrunner in the 300 usd category? My main amp doesn't have pre outs...any other contenders? I understand audio nirvana is not available at this price point...my Triad sats go down to 80hz...small room...just looking clean, well articulated bass for lower octave