Weird noise with stereo XLR outputs

[trhx]

Sometimes when I connect my XLR outs to my UI24r mixer, I get noise going up to about -24 or so on one channel and a little bit of noise on the other channel. When I switch the cables only on one end, all the noise goes away. I've seen this several times over the course of a few months.

 

Obviously, the fix is easy but I'd love to understand what is happening here. I wouldn't think that the mixer cares or even knows which Helix output is going into which mixer input. The inputs on the mixer are stereo linked, so I can try to unlink just to see if that makes a difference. Any other educated theories are welcome.

 

Also, I realize that any issue could be with the mixer rather than the Helix, so I guess I should post in a UI24 group, too.

[Schmalle]

Don't know. Does the Ground Lift make a difference?

[ricstudioc]

Also take a look at phantom power settings at the mixer, it's fairly well documented that the Helix xlr's don't always play nice with phantom.  Not sure how simply swapping cables would rectify it, but hey - I'm answering a question without seeing the issue.  An "educated theory".

[waymda]

I also run my Helix direct into a UI24 via XLR.

 

The Helix is set to mic level output and the UI needs no gain added to get a healthy signal.

 

Whilst this doesn't help with diagnosis, I have not experienced what you describe in 2+ years of use. I would support looking at whether phantom power has been accidently turned on for one channel.

 

If that makes no difference try a) a seperate source on the channel, b) a seperate channel or set of channels on the UI24 to isolate the issue.