Hi MarcosCH - This is super helpful and exactly what I have been looking for, where the output and internal processing bitrate and sampling frequency matches that of the inputs (miniDSP upsamples everything).
Three questions before I take the plunge:
1. Have you found out a simultaneous digital coax (not optical toslink) input/output solution that works with RPi4?
2. If not, then how did you make the SB X-Fi HD USB work with RPi4, as you mentioned earlier that you had to do some additional work?
3. Have you looked into or can you suggest how to make something like raptorlightning-i2s HAT work?
Thanks in advance!
dehati
Hi dehati,
Glad that it is helpful for you. To your questions:
1. No, I haven't searched nor I know of any USB card with coax in and out. My need was to use this with my tv as a source and my tv has toslink output. But if needed and you can't find any, you can always use two USB cards, one to capture and a different card, or a USB dac, to output.
2. The sb x-fi HD has toslink in and out. It is a great card that I still use as ADC to stream the signal from my turntable, but I remember to set it up properly was not that easy for me. Think that at that time those were my first attempts with camilladsp, maybe it is not that difficult after all. Unfortunately I didn't take notes, but I can tell you it is indeed possible
3. I don't know that specific hat. I never tried i2s hats because I consider they are relative expensive and of limited use compared with some very cheap and competent USB cards that you can also use outside the rasp pi world. I suggest you to ask in the camilladsp tutorial in this same forum.
4. Extra info: Eventually I used a pi 4b 2gb instead of the zero 2w and I find the set up much more stable. I used to leave it on literally for weeks with no need to reboot ever.
Hope it helps, good luck!