Thanks for bringing that up. I did try it, but it doesn't work from my computer. Tried 2 different USB->SPDIF converters, as well the SPDIF out of my computer. They are supposed to get bit-perfect output, but the filters won't work.
I did try using a really old Arcam CD player (whose digital output sounds terrible compared to my current USB converter). It did work on that. However, since the custom filters are reset when when the DAC is turned off, I wasn't able to critically listen to the custom filters' effects.
I did try using a really old Arcam CD player (whose digital output sounds terrible compared to my current USB converter). It did work on that. However, since the custom filters are reset when when the DAC is turned off, I wasn't able to critically listen to the custom filters' effects.