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G70 outA+outB loud hum noise


elkabyle
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Just got a G70. This is how I use it:

 

Line6 Relay G70 - output A goes to kemper -> Frfr Speaker.
Line6 Relay G70 - output B goes to Fender tube amp.

 

Everything was fine on day one, but since yesterday I'm hearing a loud hum. If I remove one instrument cable from say output B, the hum is gone.

Could it be ground loop related? I'm quite a noob when it comes to these things.

Did anyone experience any issue when using the 2 outputs A and B?

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The more I research about the issue, the more I think the issue is coming from a ground loop when using outputs A and B. It's a shame the relay G70 does not have a ground lift on output B. It has one in output C, but I need to use unbalanced cables in my setup.

Question for line6, can I use output C with an XLR-TS cable without damaging the receiver? Something like that, to plug the outputC to my second amp and lift the ground to address the ground loop:

 

post-70937-0-91022000-1458156659_thumb.jpg

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  • 3 weeks later...

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