I don't think the quality of the electricity is as important as the quantity. The PSU in your amp promptly rectifies it and regulates it so the electricity coming out of the wall it pretty much adequate in quality. 60Hz and approximately 120V. A little noise that gets cleaned up almost totally by the PSU.
The quantity is more important. You need a ready supply of quick current for your amp to deal with spikes or quick demands. This is required to make your amp quick and responsive, especially in the bass area.
I think people often focus too much on quality and too little on quantity. A generic 10awg cable will get you 99% of the way there by ensuring there is a ready supply of current. Cleaning up the quality of the electricity may get you 1% since some tiny percentage of the "noise" in your electrical line may get through the PSU. But this is very tiny.
Power strips and conditioners that limit current can do more harm than good.
Jerry