danmo Posted September 23, 2022 Share Posted September 23, 2022 Hi there When I connect one amp in the L output of my Helix stomp, and one in the R output, a loud hum appear. It is not the case when I connect each amp alone in either output. The pedal board and the two amps are mains supplied through the same multiple socket, thus the same ground. Any suggestion to resolve this problem? Thanks Dan Quote Link to comment Share on other sites More sharing options...
kduck Posted September 23, 2022 Share Posted September 23, 2022 Sounds like a ground loop to me. If you have a DI box with ground lift, try it between the helix and one of the amps. If the hum goes away, ground loop verified. 1 Quote Link to comment Share on other sites More sharing options...
danmo Posted October 3, 2022 Author Share Posted October 3, 2022 On 9/23/2022 at 7:38 PM, kduck said: Sounds like a ground loop to me. If you have a DI box with ground lift, try it between the helix and one of the amps. If the hum goes away, ground loop verified. Hi Thanks for your reply. I checked with a DI and lifter ground, and yes, the hum dissapear. So your solution works right. Is it the only way to solve that problem? Thanks again for your help Quote Link to comment Share on other sites More sharing options...
brue58ski Posted October 3, 2022 Share Posted October 3, 2022 Are you connected to your computer via USB at the same time? That can cause hum although I think it would happen even when connected alone. Quote Link to comment Share on other sites More sharing options...
kduck Posted October 3, 2022 Share Posted October 3, 2022 On 10/3/2022 at 10:02 AM, danmo said: Is it the only way to solve that problem? Not the only way, but it is the easiest and safest, IMO. 1 Quote Link to comment Share on other sites More sharing options...
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