My personal experience. For a short time I ran all of my source equipment from dedicated lines with the amps on a seperate line thru an 'amp' filter. Unresolvable hum! I ran a line from the filter back to the dedicated line and the hum went away. I have since read of others who have also concluded that the amps and pre's/sources can sound better when they are all on the same dedicated line, everything else being equal.
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