Hmmm..., Peete and all others,
I wonder what the DSP-1 really does inside the R-5. I would expect it to "clean up" the signal or "put things in the right order". I see it as a kind of a re-clocking unit, but from my words you can tell that I'm a dummy with these technical details. Nevertheless, the DSP-1 is something special and should do something special to the sound.
There might probably be a certain relationship to the DSP-3, although I know both were programmed for the specific units they are working in. Nevertheless, concerning "signal cleaning" I expect them to do something very similar. Btw.: the R-5/DSP-1 isn't capable of asynchronous USB mode (the DI/DSP-3 has probably something to do with asynchronous USB operation in the DI - or is it solely the firmware/driver inside the DI), right?
So isn't there a significant upgrade in SQ to be expected over the NFB-2/3 to R-5, simply due to the DSP-1? Plus probably a generally different sound signature due to the different converters and certain consecutive differences in their implementation?
Eunegis