Anyone using B&W DM604s ? Does one need a BIG poweramp to drive those as main ,without sub ? I have a Kenwood KRF-V5560 and am about to purchase some 2nd hand 604s . I just wonder if my Kenwood can handle these ? The amp is listed 5 X 100 Watt ,but that's an overstatement. It's just about right for my DM570s and I'm affraid the 604 needs some more power. After all it has 1 mid and 2 low freq drivers instead of just one mid / low for the dm570. Cheers, Herman.