Elizabeth makes some very valid points.
I have my Emotiva UPA-7 plugged directly into my wall socket which is not on a dedicated line and whenever anyone has watched movies with me they never complained about the sound.
For my 2 channel set up I have a McCormack DNA-1 Deluxe now plugged into a vintage Tice Power Block Power Line Conditioner and to me the music sounds a lot less grainy and lean. I have some improvement in the treble. It is less harsh overall.
I have my Emotiva UPA-7 plugged directly into my wall socket which is not on a dedicated line and whenever anyone has watched movies with me they never complained about the sound.
For my 2 channel set up I have a McCormack DNA-1 Deluxe now plugged into a vintage Tice Power Block Power Line Conditioner and to me the music sounds a lot less grainy and lean. I have some improvement in the treble. It is less harsh overall.