Some rewiring to get the grounds sorted out fixed that.(I was using a PCIe sound card with single ended outputs) As for ground loop noise, it should be taken care of XLRs differential nature but nothing has an infinite common mode rejection. ![]() ![]() I built a home theater PC for the living room with a 5.1 amplifier built in to the same case and had at first a noise problem where i could hear CPU load in the speakers. Its worse when you try connecting stuff inside the PC. ![]() ![]() Power coming from USB will always be noisy but if you have good input filtering and regulation it should not be too big of a problem.
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