Originally Posted by laserjock II
Have a chance to pick up a B&K Ref 7250 Series II amp for $450, currently driving my RC-70's plus RC-LCR, Polk FXiA6 surround 5.1 system with the Denon 4520 receiver.
I'm happy with the way they sound but wanted to know thoughts on any improvements an ext amp would have if any?
The B&K is a big amp, 87lbs and rated at 200W/ch at .09% THD at 1Khz 8ohms.
The 4520 is a pretty powerful receiver and you are only using 5 of its 9 amps. With only 5ch driven it should be able to easily put out 120+ w/ch (and since all channels aren't driven constantly with real content it's going to be more than that). And the RCs are fairly easy to drive.
The real question is how loud you listen? For a living room type setup where you only get moderately loud -- say no higher than 15-20 dB below reference -- you likely won't see any benefit. If you are trying to play really loud and especially in a bigger room you may be able to eke out a bit more clean headroom and dynamics.