When I turn phantom power on to try to use my microphone, I start to hear a lot of noise as I increase the gain or the mix and output knobs. The sound goes away when I turn off phantom power. I tried recording the sound with my phone (my microphone can’t seem to capture much sound…maybe this is related). You can listen here:
Don’t listen too with headphones or too loudly because at two points a very loud/high pitched sound appears (I think my phone was too close to the speaker).
I also hear the noise when my speakers are turned off and I am using headphones when the input gain is turned all the way up and the mix is turned towards input