I’m experiencing a static noise when connected over USB. It is not hum, it sounds like a radio static noise. Sometimes it gets louder.
The system is dead quiet when no USB cord is connected to DAC (with all other cables connected and AMP powered up).
It is also quiet when only USB cord is connected with nothing on the other side.
The same static noise appears when the other side of USB cord is connected to any computer (I tried 3 different laptops on battery and plugged in).
Noise level is constant (pretty loud) and doesn’t depend on volume or music.
Even if DAC is on mute or off (from remote) there is still the noise.
One more interesting fact, when I connect DAC to computer with no PS audio drives the system is quiet. After I install drivers I start hearing that noise. I guess without drivers OS (windows 7 64bit) doesn’t recognize USB device and doesn’t send any signals to it?