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little story-
I had a friend who was constantly chasing problems with his AV system. He built his own amps and used some really nice designs that were supposed to sound great. He brought this amp to my place and it sounded wonderful with my old CV towers. But back at his house they were just grainy sounding on the top end and inconsistent to all get out.
His powered subwoofer also kept blowing capacitors and he didn't know why. He was tracing every circuit to find where the problem was and ended up plugging a volt meter into the wall socket- now he lived in a pretty old house- the reading was 132 volts (!) and depending on the day an the time, this would vary anywheres from 122-132. So even if his meter was off, it still varied like hell. This is why he was blowing caps- once rectified, the voltage he had calculated out of the rectifier for was too low compared to what he was getting and the caps weren't rated high enough.
Definitely makes a difference if you are in a home with crap power. Modern, new houses with good grounding and panels with nice service line are much better in my experience.
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