I am using a KR Kronzilla SD with 22 Watts for the mid and high and a Krell FPB 600 for the woofers on my VS VR4 Gen III. In the beginning it sounded crap

, because the Krell hugely overpowered

the Kronzilla

. Now I have a balanced potmeter

between the AR pre and the Krell, which works perfectly

. I have a clean and powerful bass and wonderful high and mid, thanks to the KR

.
I have tried both amplifiers with the entire system, but the KR evidently lacked the power for the bass

and the Krell missed the musical element in the mid and high

, very focussed, but not very musical.