Do your speakers allow for bi-amping? I did that with my Totems (used channel A and B at the same time to drive a single speaker that allowed for bi-amping. The 7007 is a beefy receiver, and Polks aren't known as a hard to drive speaker. It'd be different if you were trying to drive a pair of electrostats or something.
A few minor tweaks, apologies if some of them sound condescending:
- When you have it on music, is it set to 'stereo'? If it's trying to play it in 5.1/7.1 or something it's going to be much quieter. There should be a 'stereo direct' option too which will basically get rid of any processing and just use the amp.
- Can you increase the db on the front speakers (IIRC Denons can go +5 or 10 from base level). That would allow for more volume outside of just the volume control.
I just find it tough to believe you can't get more out of that amp. I have a Pioneer in the same range as the 7007, and a Denon below it, and both of those can drive my speakers (should be similarly as easy to drive as the Polks) to ear-bleedy volumes.
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