Ok. So, to be more precise, the PM16 is a stereo integrated amplifier, not a basic power amplifier. The PM16 has its own preamp and power amp sections and its own volume control.

If I understand you correctly, then, the amount you can turn up the SR6004 will be limited by the volume of the center speaker, so that volume setting will also limit the signal from the SR6004's pre-outs for the front left and right speakers. And since the PM16 isn't a pure power amp, you have to increase its volume control enough to get sufficient power output to match the center-channel speaker's volume level.

That all makes sense.
-Alan


Alan Lofft,
Axiom Resident Expert (Retired)