Originally Posted by TLY
Hey Headphoneaddict, I read through your review and you briefly compared the DAC of the uDAC to the Super Pro DAC707. You said you recomended the uDAC's USB over the Super Pro's USB but if I were to use the Optical of the Super Pro, would that really make that much of a difference in sound quality?
The Super Pro via optical is pretty good, and similar to the Headroom Micro DAC or iBasso D10 optical quality. There was a very slight grain to the Super Pro sound with a cheap PSU that was completely gone with my Sigma 11 PSU or 12v battery, and at that point the sound was almost indistinguishable from the Micro DAC. Via USB the Super Pro was not grainy with stock PSU, but rather was slightly blunted and veiled sounding. The uDAC-2 RCA output however is better than the uDAC, and sounds as good as my Pico DAC-only via USB or Micro DAC via optical.
If you must use USB then the uDAC-2 or Pico DAC-only would be a good choice, as well as the DACport if you don't mind feeding the headphone out into an amp as a preamp. The iBasso D4 USB DAC is also better than the Super Pro USB DAC, and on about the same level as the optical from Super Pro, Micro DAC or D10.