I have DI boxes with ground lift, but not really sure that will help. The whine can be heard even when all the inputs are set to -inf dB, just by turning up the master volume past 9 o clock or so…
Damn. Guess there isn’t much to do in that case, I’ll just have to live with it. I was hoping the whine could be lessened by removing the DC outputs and the speakers from connecting into the PCB or something like that. I don’t need the DC outs nor the speakers at all, they are just clutter for me.
In any case, thanks for chiming in!
EDIT: Just occurred to me that I’ve never actually tried the rca outputs yet. Perhaps the whine is only present on the headphone out. Checking that next, once I get this thing back together again 