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Laine Flack
Laine Flack's picture
Last seen: 5 months 2 weeks ago
Joined: Dec 6 2021 - 2:31am
Help! Ground Loop Interference

Hi All,

I really hope that someone can help me.

I have an in ceiling subwoofer that is picking up mains hum from the other power cables that run in the same loft space.

I've purchased some flexible metal conduit and run the subwoofer cable through it to see if this makes any difference, but it doesn't seem to change anything.

The flexible metal conduit is not grounded. Would grounding help?

I've ordered a ground loop filter to try and assist, but beginning to run out of options.

Would shielded speaker cable help?

Any advice or guidance would be gratefully received.

geoffkait's picture
Last seen: 51 min 54 sec ago
Joined: Apr 29 2008 - 5:10am
Always run power cables and

Always run power cables and other cables at 90 degree angles to each other, never in parallel. That should greatly reduce electromagnetic interference.

manunkind's picture
Last seen: 5 days 18 hours ago
Joined: Apr 27 2019 - 7:27am
The flexible metal conduit


Recently I rearranged my setup, and started to notice that my turntable RCA cables started to pick up strange EM interference. Like geoffkait said, I tried to distance the power cable from my turntable (Rega RP1) from the signal cables- it helped a bit, but didn't solve the problem entirely. I got that flexible metal conduit and fed the cable through it- it worsened the interference. Now Rega, for whatever reason, does not have a dedicated ground cable- so i ran a wire from the flexible conduit to the ground connector in my amplifier- and the EM noise all but vanished.

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