Hilde45,
Here has been my experience:
(1) Biggest change was pulling two dedicated circuits, one for the amplifier and one for a Panamax M5300-PM power conditioner (which signal components are plugged into)
(2) Upgraded power receptacles, finally settled on Furutech GTX-D(G) which is gold plated (vs the GTX-D(R) which is rhodium plated…..the rhodium is more revealing but a touch harsher
(3) Plug the amp directly into the Furutech receptacle, and not into the power conditioner. Much more dynamic and “immediate” than through the conditioner
(4) I also use Pangea’s Cardas copper higher end cables, there are much better cables to be had….I’ll be replacing some of mine as I can afford (after replacing my streamer)