Why power cable effect overall syste sound?


Power cables effect the system sound. This is a well-known fact. My question is why.. specially in case of low power type "A" amplifiers where current is constant. In my single ended 300B the cable creates huge difference. Does it points on power supply PSRR issue? Actually in case of well designed power supply, the power cable should not introduce any improvement. We are spending hundreds of dollars for the 1 meter of cable from outlet to IEG socket where meters of cheap wires running in the walls and it does work. The answer on this question is puzzling me.
abronfer

Showing 1 response by larry_s

A few years ago or so on another forum a member who had an incredible listening room constructed (~$75K) and easily over $150K of gear swore up and down changing power cables to his powered sub inside the overall speaker enclosure made a noticeable difference in sound. People gave him the usual "no way" for the usual (correct) reasons. He finally did allow some of the other members to come over and do a blind test. Somehow when somebody else touched the power cables they lost their magical powers - he could no longer hear the difference when he didn't know which cables were being used. Funny how what you remember may not be what you actually heard in the first place even though you'd bet money on it.