Originally Posted by adnc
Originally Posted by tomb
Hmm ... I have not noticed this at all, neither have any of the ones I've measured shown this. It can be caused by a number of things, though. Regardless, you have something that can improve bad DAC environments quite a bit.*
* I have come to the conclusion that laptops are just not a good source for USB-powered DACs, period.
I'm seeing this on the Raspberry Pi where I mainly use pupDAC and also on my Samsung notebook.
Everything I've read about the Raspberry Pi, unfortunately, is that it is problematic in supporting USB audio. Again as I stated above, the PupDAC perhaps represents the maximum that one can go in USB-powered performance. Because of that, a laptop/notebook USB connection is probably not going to be enough for a PupDAC in some scenarios.
We converted to all laptops with docking stations where I work and frankly, I've been totally astonished at how bad the USB power is in that kind of arrangement. Unfortunately, even a docking station still uses more or less the same power adapter as the laptop. A powered USB hub will help, but the power on those is pretty cr*ppy, too.
For some reason - I guess the enormous power available in the typical desktop power supply - a desktop PC does not seem to have these issues.
P.S. It should be noted that if you follow many of the threads on the ODAC, similar issues have been noted - especially dropping on and off at the drop of a hat. NWAVGUY put a humongous ferrite bead on the USB input to compensate. I don't agree with that strategy, but still - more evidence of the issue.
Edited by tomb - 1/17/14 at 3:40pm