In my office setup, I have a RPi which connects to my DAC (S.M.S.L. Sanskrit 10th V2) via USB, a TV which connects to my DAC via TOSLINK, and a connection to my PC over S/PDIF. The DAC connects to a WAD HD83 headphone amp and I’ll soon have a pair of desktop speakers.
The problem I had was ground loop from the PC to the headphone amp caused by the ground of the S/PDIF. I rummaged around online for a S/PDIF isolating transformer and couldn’t find one.
Lundahl make a transformer for digital audio, the LL1572 which would have done the job, but they seem to be in short supply.
Where else could I find a digital transformer? Ethernet uses transformer coupling and I just happened to have a surplus to requirements PoE injector lying around. Prised the lid off and lo and behold there’s a transformer inside:
@rrwwss52 I bought the ifi SPDIF iPurifier2 and then ifi Lan Silencer.
I have built my own streamers over the years and trailed them against a retail $2.5k streamer (roon ready) streamer until I home built a ‘stop spending $£’ model as you as mine is better, model that $3.5k model. I know streamers can make a difference (after speakers, Amp, DAC?? Stopped me changing my DAC!!!)
Anyway, I had the chance to pick-up a converted streamer ($4.4k MRRP) that included CD buffered play back and ripper + art worked displayed, HDD storage music server and amazing build quality. Oh and a streamer.
However, I was gutted as the SQ was a step back worse than my ‘stop spending $£’ model’ I looked at its internals and thought 1. May need a better power supply? 2. Where is the re-clocker/clocks? 3. Where is galvanic isolation? 4. Output stage looks!?!?!? 5. The computer board and the sound board are on the same board ….NOooooo Etc.
So, I bought the ifi SPDIF iPurifier2 – expecting not a lot of difference and that I would send it back! However straight out the box the ‘Sound’ had changed. So dived into a playlist for a few hours and the ifi SPDIF iPurifier2 sounded better than my ‘stop spending $£’ model home build streamer’.
A keeper in this use case. I suspect the kit and the case are key.