stevee1966 said:
Addition to my last post :-
My Hegel H160 is 150w @ 8 ohms
The Marantz is 125w (so not massively lower)
The B&W CM10's claim they need anything between 30 - 300w to drive them.
Beware AV receiver power ratings. They rarely indicate the amplifier's ability to grip the bass of speakers. My former 60wpc integrated amplifier had far better grip of the bass than my current 110wpc rated AV receiver (when playing 2-channel music in Pure Direct mode).
I've heard your Hegel. It grips the bass very well indeed. I think you would be disappointed with an AV receiver driving floorstanders like that unless it's a decent model from Arcam or Anthem. If you were looking at the usual suspects of Denon, Marantz, Pioneer & Yamaha, I'd be looking at their top models in the range at least. Floorstanders often have pretty high sensitivity, so technically don't need as powerful an amp to drive them as smaller speakers, (they produce a higher volume for the same amount of power) but in reality an AV receiver's power supply limits its ability to control the bass, so it can be bloated and slow and dominate the mix. Yes you can set a crossover and use a subwoofer for low frequencies, but that kind of negates the point of having floorstanders in the first place.
Sorry to mention this but bloaty slow bass is a bit of a hobby horse of mine. I remember hearing a demo comparing two Hegel amplifiers. The more powerful of the two had noticeably LESS bass presence, but what was there was well controlled and quick to react. Many people have the misconception that more power = more bass: but it's often the opposite. The bass may have more kick and speed to it, but there will also be less distortion and less bloom.
One possible way round it would be to add a decent power amp at some point. But knowing your Hegel, I'd definitely strongly recommend having a thorough demo before taking the leap, and pay good attention to how the bass sounds within the mix of tunes that you know well with your Hegel. Actually I'd recommend taking your Hegel to a demo and doing back-to-back comparisons.