So you have a great hi end stereo preamp, but

There's plenty of products known to improve sound merely being plugged into an outlet. So we know for a fact things plugged in can affect the sound quality of other things that are plugged in. You seem to think this is a one-way street. That things connected to the grid cannot harm sound quality.

Nonsense.

Why can’t the OP use a HT processor that has analog pass through so the analog signal bypasses it’s DAC, straight to the amps?

Oh, he can. For sure. Probably does. So what? Its still ruining the sound merely having the thing in the same room. People probably think I’m kidding, or exaggerating. I am not. I tried all this stuff, and with much better processors than any avr! HT is a wasteland. Guaranteed to bring down any system, any price, even just being in the room and turned on. Not even necessary to connect it to anything. Its that bad.

The great writer Harlan Ellison, speaking of Joan Collins, said, "Her mind is a vast barren plain, across which winds play, endlessly." That’s HT.

After reading his last post I think you should have said, "Okay, enjoy yourselves."

This might be a good time to submerge for a while.

He has a avr. He's actually using it. Nuff said.