I'm having a noise issue with my setup.
RaspberryPi->HifiBerry DAC+DSP->unbalanced->MiniDSP2x4 balanced->balanced->Icepower 200AS2(x2). I'm using the hanger bus off the 200AS2 to power the Raspberry Pi and the MiniDSP off the hanger bus. DC voltage is converted via a dual output step down DC/DC Converter -
PQF20W-Q48-D512-D. However, when powered this way, there is a lot of digital switching noise making it through to the 200AS2. If I power the MiniDSP from a separate power supply, the switching doesn't make it through... Seems odd as the two outputs from the DC/DC Converter are supposed to be isolated.
Any ideas before I end up double up on power supplies, rending the current dual output useless?
Side note: if I bypass the MiniDSP and run balanced into the 200AS2 and ground the inverting to shield, I get a high pitched noise out of the speaker (~500 + harmonics up to 3kHz - very odd).
RaspberryPi->HifiBerry DAC+DSP->unbalanced->MiniDSP2x4 balanced->balanced->Icepower 200AS2(x2). I'm using the hanger bus off the 200AS2 to power the Raspberry Pi and the MiniDSP off the hanger bus. DC voltage is converted via a dual output step down DC/DC Converter -
PQF20W-Q48-D512-D. However, when powered this way, there is a lot of digital switching noise making it through to the 200AS2. If I power the MiniDSP from a separate power supply, the switching doesn't make it through... Seems odd as the two outputs from the DC/DC Converter are supposed to be isolated.
Any ideas before I end up double up on power supplies, rending the current dual output useless?
Side note: if I bypass the MiniDSP and run balanced into the 200AS2 and ground the inverting to shield, I get a high pitched noise out of the speaker (~500 + harmonics up to 3kHz - very odd).