I have found tremendous benefit from cleaning the exterior and interior power.
I ran 3 dedicated lines. I found putting my mono amplifiers on one line, my digital on another and analog on the third. I have a Denali on the analog and PS 10 Powerplant on the digital. I have found changing the settings on the PS 10 to have a lot of influence on the sound.
I have removed all SMPS power bricks from the above lines and run them on a house line. I found the SMPS injected significant noise and caused ugly distortion.
I have an Akiko Corelli on the Denali, it dropped the noise level.
I have LPS's for as much gear as I can.
I ran 3 dedicated lines. I found putting my mono amplifiers on one line, my digital on another and analog on the third. I have a Denali on the analog and PS 10 Powerplant on the digital. I have found changing the settings on the PS 10 to have a lot of influence on the sound.
I have removed all SMPS power bricks from the above lines and run them on a house line. I found the SMPS injected significant noise and caused ugly distortion.
I have an Akiko Corelli on the Denali, it dropped the noise level.
I have LPS's for as much gear as I can.