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In my opinion, I dont think it's because of 3.5 jack, it's from a pc, ground loop isolator fixes that issue.

@Lambda its amp not dac. i wrote that im using aiyima a03, anyway, those ground noise isolators did the job, i dont have anymore buzzing/hissing/etc, and sound is not quality compromised.

aiyima a03, that didnt helped, i ordered some ground loop isolator to see if it helps.

Hey, i just discovered this forum, So i bought aiyima 2.1 amplifier, when connecting it to the phone, everything is ok, but when i do connect it to pc (rca to 3.5 mm) there is an annoying buzzing/humming, (in the front and rear) i tried with different cables with different power supplies (one...