realized after a spammer posted on this that I never updated.
I tried some more testing and realized that my results from previous tests were inconsistent. I thought I had narrowed it down to the center channel, but I found I had buzz using other audio devices as well though the same amps and in no particular pattern. So I scrapped the amps all-together and was going to buy a 5.1 computer/gaming speaker system but couldn't find anything that I liked, so I bought a 5.1 theater receiver and connected to my PC through optical. I had to run a patch to get my sound card to push 5.1 through optical, but all is working well. Using optical for sound allowed me to use the other channels on my sound card for haptic feedback channels for sim racing and such as well, so it worked out in the end.
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