I second the B&K amps and did own a 2-channel(EX4420) and a 3-channel (REF4430) and would say they are rock solid amps. The 5-channel(200.5 or 7250) may be a better choice because of the much larger power supply. Good bass, very sweet midrange, somewhat rolled off highs(tame the B&W's some) are my take on the B&K's overall signature.
Bill
Bill