Amp straight into the wall

@bikeboy52   As with most things audio, it depends. 

IF panel, ground, wiring to the wall and the wall outlets, etc. have all been addressed properly AND your amplifiers are a quality design and build THEN, yes wall direct is typically best/better.

@david_ten Yes  circuit is a clean 20 amp home run number 12 romex straight to a hospital grade gound fault receptacle ,amp is Prima Luna Evo 400. Thx , thats a much simpler explanation than I was expecting​@ghdprentice  thx.

@ghdprentice P.S read you praise of the AQ cable that you use on your amps the other day ,really wish I could afford one of those, Ive always felt like Im leaving some SQ in there somewhere and feel that would be a good place to start looking,

Straight to the wall just sounds better for amps! Don't know why ! Just do!

Totally agree, I auditioned perhaps 10 different PC some years ago, every single one constricted transients to some extent. This with 845 SET amp. I use 10awg on 20 amp on my dedicated only for amps line.