Dougunn
pfm Member
Going a bit crazy here, any help gratefully received . . .
I have a miniDSP DDRC22D Digital box that provides Dirac processing in my system. It is connected between a Raspberry PI with Allo Digione Signature and a Benchmark DAC2 by coaxial cables (from Mark Grant). The RPI and its Allo board are powered by dedicated linear powersupply. The DDRC22D is powered by a simple wall wart PSU all connected to a Tacima mains block (with surge protection and noise suppression).
Unfortunately whenever I operate most electrical switches in my flat (lights, heating, cooker etc) the audio will cut out momentarily. The worst example of this is starting a fluorescent lamp which interrupts the audio significantly. If I take the DDRC22D out of the system everything works fine. I have been in touch with mini DSP who initially suggested switching out the IO board which I did (out of warranty) to no avail. They have now suggested that the problem is likely a grounding issue. Presumably RFI from nearby switches being picked up and momentarily screwing up the datastream?
I am however a bit lost as to how to remedy this - although I suspect there still might be a hardware fault in the DDRC22D as, when I first obtained it (over a year ago), it it worked fine.
The chassis on my Benchmark DAC is connected to earth but the DDRC22D and RPI are not. As an experiment I connected the ground of the unused RCA connector on the RPI to earth (so that the cable shields from the RPI to the DAC (via the DDRC22D) and the chassis of the DDRC22D itself were all grounded) and the system stopped working!
I'm now stumped, but must confess I am a little unclear on grounding in this context.
Any electrical experts out there who can give me a steer or suggestion as I really like what DIRAC does but the constant dropping out is not tolerable.
Doug
I have a miniDSP DDRC22D Digital box that provides Dirac processing in my system. It is connected between a Raspberry PI with Allo Digione Signature and a Benchmark DAC2 by coaxial cables (from Mark Grant). The RPI and its Allo board are powered by dedicated linear powersupply. The DDRC22D is powered by a simple wall wart PSU all connected to a Tacima mains block (with surge protection and noise suppression).
Unfortunately whenever I operate most electrical switches in my flat (lights, heating, cooker etc) the audio will cut out momentarily. The worst example of this is starting a fluorescent lamp which interrupts the audio significantly. If I take the DDRC22D out of the system everything works fine. I have been in touch with mini DSP who initially suggested switching out the IO board which I did (out of warranty) to no avail. They have now suggested that the problem is likely a grounding issue. Presumably RFI from nearby switches being picked up and momentarily screwing up the datastream?
I am however a bit lost as to how to remedy this - although I suspect there still might be a hardware fault in the DDRC22D as, when I first obtained it (over a year ago), it it worked fine.
The chassis on my Benchmark DAC is connected to earth but the DDRC22D and RPI are not. As an experiment I connected the ground of the unused RCA connector on the RPI to earth (so that the cable shields from the RPI to the DAC (via the DDRC22D) and the chassis of the DDRC22D itself were all grounded) and the system stopped working!
I'm now stumped, but must confess I am a little unclear on grounding in this context.
Any electrical experts out there who can give me a steer or suggestion as I really like what DIRAC does but the constant dropping out is not tolerable.
Doug