2nd the Hafler suggestion. ie:(http://cgi.ebay.com/HAFLER-9300-AMPLIFIER-AMP-1200-WATT-HOME-THEATER-MOVIE_W0QQitemZ230373733135QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item35a358330f&_trksid=p3286.c0.m14) The DH-500 will drive you up a wall with it's fan noise. Other than that; they're a potent bass amp. The TransNova 9300/9303 and 9500/9505 are all fast and testicular(with no fan) which makes them excellent woofer amps. You'll have to attentuate whatever you get to match the drive of the amps. A Synergistic Research AC Powermaster will make a world of difference with one of these, BTW.