I have used the Crown CTS2000 amp for subwoofer. This is an evolution of the same K2 type technology (Class I). While these amps are very good for the money on the used market, they just did not control the subwoofers as strongly as a very high current Class AB amp. My Emotiva XPR-1 monoblock is the strongest subwoofer amp I have ever used. The XPA-1 monoblock is probably the next best thing. If you have lots of money, the Bryston monoblocks would probably be very good. Or Parasound JC1.
