Hi,
I have always had this problem with a little ground loop hiss, which I think I've traced down to the small current from the Power supply, used to keep the motherboard turned on. If I plug my amplifiers in without their ground plug (not a good idea, I know), I can get rid of almost all of it. I may go to a 6 d/a channel USB audio interface to get rid of it, but I wonder if anybody knows other things I can do; I wonder if it's just the design of this motherboard, or perhaps of this power supply. If I knew for sure that some other motherboard would not have this problem at all, I might upgrade to it. After a lot of testing, I am sure that there's a spurious signal included on the analog signals coming out of my computer's built-in sound card or PCIE card, that is trying to get to ground and causing the problem. Using a higher quality (2-channel) PCIE sound card reduced it a good bit, but not entirely. I need 6 channels currently (doing DSP in Linux), so I went back to using the on-board analog outputs, and the noise is there, louder, again. Any ideas or education for me?
Thanks,
John
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