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<blockquote data-quote="littlematt" data-source="post: 878142" data-attributes="member: 25302"><p>OK went to Cories an JA Russel, no cheater plugs. But JA R was very helpful, took my number and got an AV guy from the city branch to call me, gave me a few ideas. Still no success though. However I was wrong about one thing. The PC needs to be plugged in for the hum to occur, doesn't have to be on or even on at the wall so its definitely an earthing issue, no? Have tried a different audio cable, tried the MB audio out, tried a different power lead of the PC with shielding and magnets on it.....Nope. Tried a double adapter for the PC and Amp, nope. I thought a loop had to be a circuit, with a common earth where the hell is the current coming from? I tried my multimeter but its a super cheapy and only measures in 100s of AC volts, so got a zero there.... The speaker cables run under the house so I thought maybe they were getting a bit of current induced in them so ran a short bit of speaker cable above ground, still no joy. Dag nabit, this is pixxing me off. The soundcard is earthed properly, I blew out all the dust about the only thing I can think to do now is to swap out the antec power supply with the corsair unit in my desktop..... Tried plugging my old ipod in for the source, no hum..... Also tried turning absolutely everything else in the house off at the wall....No joy of course.</p></blockquote><p></p>

[QUOTE="littlematt, post: 878142, member: 25302"] OK went to Cories an JA Russel, no cheater plugs. But JA R was very helpful, took my number and got an AV guy from the city branch to call me, gave me a few ideas. Still no success though. However I was wrong about one thing. The PC needs to be plugged in for the hum to occur, doesn't have to be on or even on at the wall so its definitely an earthing issue, no? Have tried a different audio cable, tried the MB audio out, tried a different power lead of the PC with shielding and magnets on it.....Nope. Tried a double adapter for the PC and Amp, nope. I thought a loop had to be a circuit, with a common earth where the hell is the current coming from? I tried my multimeter but its a super cheapy and only measures in 100s of AC volts, so got a zero there.... The speaker cables run under the house so I thought maybe they were getting a bit of current induced in them so ran a short bit of speaker cable above ground, still no joy. Dag nabit, this is pixxing me off. The soundcard is earthed properly, I blew out all the dust about the only thing I can think to do now is to swap out the antec power supply with the corsair unit in my desktop..... Tried plugging my old ipod in for the source, no hum..... Also tried turning absolutely everything else in the house off at the wall....No joy of course. [/QUOTE]

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