Since I bought my new audio setup a few weeks ago I've had a constant problem. Every so often (maybe 10% of the time) there is a high pitched, oscillating noise in the right ear of my headphones (beyer DT880 600 ohm), I'd say it goes between 10 KHz and 13 KHz as a rough estimate. I can't hear it when there is music or other audio playing but when there is no audio output I find it very, very annoying.
I have a Schiit Modi and Magni paired with it, the Modi is connected to a rear USB 2.0 port on my PC. I've tried juggling USB connectors about but the problem still persists. I cannot replicate the problem on command, it's completely random. I know sometimes things like this can be caused by moving the mouse around but it's not the case on this occasion.
I'm fairly sure it's some sort of interference with the USB bus on my motherboard. Is there anything I can do to stop it? It may also be a problem with my DAC/amp but from what I've researched, I don't think that's the case.