Sorry guys if it is already answered, can't read the whole thread (chronic eye strain), but can you suggest some similar USB to SPDIF/coax converters like the Eitr or Topping D10, hopefully for 50$ or less, but as clean as those? I really don't need any functionality, just as clean USB to SPDIF/coax conversion as possible, nothing else. Maybe the D10 is my cheapest option?
You perhaps could just try buying Douk Audio or Breeze Audio one, they are cheap. Cannot personally confirm how they perform at the moment, but will perhaps buy of those later, as Eitr surprisingly doesn't have optical out.