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Question about upsampling: I have read that in some DAC's there is automatic upsampling, and some you have to manually set the rate you want it upsampled to. Do we know what is the case with the d90?

the fact that the frequency changed with a different supply is really tripping me out. But that does make a bit of sense. the damn blue light does not ever seem to stop flashing either... wish they had the same exact box but with the bluetooth on a switch. I did snag a stereo 3255 from them as...

Just got myself one of these AIYIMA TPA3255 Amps (2.1 w/ BT version) for my entertainment setup: https://www.aliexpress.com/item/33032214800.html?spm=2114.12010615.8148356.8.42846d7bt0QuNx I wired it up with a mean well 48V 7.3A supply, and I noticed a small amount of mains hum. Even with the...