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Quoting kkissinger@kevinkissinger.com: > For starters, if the amp has a headphone jack have your friend listen > through the headphones. Is the hum present in the headphones? Also, > have him disconnect the speakers. Is the hum still in the headphones? > If the hum is still present in the headphones, then the speaker cables > are not the source of the hum. I forgot to mention, turn off your amp before connecting or disconnecting the speakers. -- Kevin