THE WALL---Why?

Yes , Why is it amps and power products tend to not do well together ? Class A , D , AB amps have all sounded worse when pluged into a Torus bit for me . Same result with Furutech receptacles with amps .

I find a dedicated 20 amp line sounds better and considering installation cost of such is generally lower than the cost of a good conditioner it's almost a given.  As to why - I'm no EE but I would suspect a "conditioner" alters the supply so that a good quality amp just passes what it's getting.  After all an amp just modulates the juice from the wall so that it follows the (relatively) tiny input from the preamp...

It's a matter of electrons. Specifically, how many electrons can get to your amp when there is a sudden draw. (The wave description is equally valid.) Engineers call this source impedance - ideally, you want a source with zero impedance, like a dedicated power station.

If a dedicated power station is out of your budget, try a large isolation transformer which will clean up the power but not increase the source impedance. Plitron makes a good one - toroidal - good enough for medical equipment - and they sell to the public. Works for me, for all my equipment. YMMD

Should have said that toroids tend to growl when they are doing their job, so it's better to site them in a garage or utility room.

I have my  entire tubed based system including my amp, into my power plant.
The PP just seems to add a  subtle dimension of clarity or clearness to the sound.
The amp straight into the wall still sounds nice, but I prefer the PP S

I have my plasma on a rollaway. On movie nights, I position it between the speakers and plug it into the PP as well. Beautiful picture along with amazing audio.

I wouldn't listen/watch without one.