I've had issues with my DO100. When making REW measurements for EQ I was getting sudden dropouts around 5kHz. So, I was able to replace the dac. Unfortunately, the replacement has the same issues.
With my replacement dac - same R channel cutoff issues - I was able to circumvent the cutoff (turn the dac off and back on for each measurement) and update the EQ. I don't know what to make of the R channel issue. It seems to be type of protective cutoff - though only on the R channel. When doing a second REW measurement without turning the dac off and back on, I get a sudden audible snap in the sound 2/3 of the way through the measurement, resulting in a pronounced frequency drop around 5kHz. Both dacs do this identically. Also, when sending full range pink noise to the R channel via REW, I get about a second of sound and then nothing. Only when I turn off and back on the dac can I repeat that second of sound. The L channel does not have this problem. It plays the pink noise just fine.
What is happening? Should I return and dac and get a different dac altogether? Is this problem really NOT a problem - just a problem (with work-arounds) when measuring frequency output? Do other dacs have the same issue? Is it because I'm measuring one monitor at a time, with no sound coming from the L channel, and therefore the dac shuts down (doesn't turn off, but stops functioning)? It's all so very strange.
My measurements and resulting EQ are solid and sound good - just as long as I restart the dac for every R channel REW measurement. BTW - it's not the monitors; I switched the monitors and had the same R channel problem.
And if I decide to replace my DO100 with something else, what do you suggest (need balanced connections)?