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Input ground loop hum only when p10 cables or XLR without phantom power are connected

I own a Scarlett 2i4 (USB interface) and all of a sudden a ground loop appeared that only makes noise when p10 cables or XLR cables without phantom power (when I turn it on, it disappears) are connected. I’ve changed the cables several times and nothing seems to work. Please help!
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erik_squires
16,058 posts
 
What are "P10 cables" ??
pedropmk_'s avatar
pedropmk_ OP
5 posts
 
TRS cables. Sorry, that's what they called them here in Brasil, forgot to translate
erik_squires
16,058 posts
 
So help me out a little more please. You are going from a Scarlett to your preamp, and those are the cables that cause hum?


erik_squires
16,058 posts
 
Let me know if the ideas on that blog post don't help you. :)
pedropmk_'s avatar
pedropmk_ OP
5 posts
 
No preamp, just a Scarlett connected via USB cables into my notebook. The cables causing the problems are the one on the Scarlett inputs, that I use whem I connect my guitar or bass with TRS cables or a mic with XLR ones...I've read that post, but what intrigues me is that the interference/hum only appears when I'm recording, when there's something connected on the inputs. When there's nothing there, the output sound/playback is perfect
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