Topic: Humming with power amp
Hi all.
I'm happy owner of RME ADI-2 DAC
I accidently discovered humming noise audible ~0.5 mtr from speakers when the DAC is turned ON and no music plays.
The humming is static and independent from VOL level.
The DAC is connected RCA to Plinius power amplifier and works as preamp.
Humming is audible even if all sources are disconnected from DAC. I've also tried using another pair of RCA interconnects to make sure the humming is not caused by faulty cables.
-That doesn't make any difference.
The humming stops few seconds after turning OFF the DAC.
My Plinius power amp has "ground lift switch" chassis/open - but it only decreases the noise in "chassis mode" a bit.
Any idea why is that noise audible? Is that normal behaviour?
What else can I try to eliminate the noise?
It's not a loud noise but annoying since I know it's there