I've been enjoying a couple of DAC+'s (standard RCA version) for about a year now.
We're using it for our multi-room audio system in our house.
To clean up all the wire mess, I've invested in stackable pi casings and one 5V power supply.
Power supply: http://www.anidees.com/usbcharger/6-port-smart-ic
The pi's are all working fine.
However, I have awful noise on all DAC+'s, even when no music is playing (amplifier is still powered on ofcourse).
When I connect all pi's with their own power supply, all is working fine.
So I know the DAC+'s are working fine but I'm not getting an answer at Anidées.
Do you guys have any ideas what the reason could be and how this could be solved?
Noise when using new power supply