Not all power "conditioners" are created equal nor are any two home/power delivery situations identical so there is no universal answer to your question. It also depends on the amp (class A or A/B). I have a Niagara 1200 in one system and I notice no difference with the amp plugged in to the 1200 vs amp plugged directly in to the wall. Therefore, you could surmise that it "does no harm" or that it does nothing at all.
Does an Audioquest Niagra 1200 limit amplifier dynamics?
Hi, I have a Belles 150A Reference amp driving Vandersteen 2E sig speakers, which I don't play loud at all. I currently have everything else plugged into a Shunyata Hydra 6, but felt it limited the amp's dynamics, so it's plugged directly into the dedicated line outlet. Would an Audioquest Niagra 1200 do better?