I currently have the Cambridge Audio P500 and A4 amps. I was considering purchasing some Dynaudio 42's - they get good reviews and I believe good for heavier, rocky music, which suits me. First of all, I realise that the Dynaudio's don't handle bi-wiring/amping, so I'll be driving them solely from my P500 power amp and using the A4 just as a pre/control amp. The P500 is rated at: 85 watts per channel into 6 ohms, 65 watts into 8 ohms. The Dynaudio's have an impedance of 4 ohms. Will there be problems with this combination?