Audio trouble with external DAC

EDWW

macrumors member
Original poster
May 1, 2008
31
0
My Late 2015 27" iMac has suddenly started acting up with my external DAC, an SMSL M8. I now get a stuttering noise as well as each channel cutting in and out and the the DAC disappears from the sound tab in system preferences and then nothing. The DAC connects to a USB port. I tried all the ports I also tried a Nuforce UDAC-2 with same results however each DAC works fine in a different computer. I don't have any problems with sound through internal speakers.

Prior to this for a number of weeks I was having a big problem with my Bluetooth mouse and keyboard staying connected which finally mysteriously resolved all by itself. Now this...

I've tried PRAM reset, SMC reset and neither made a difference.
Hardware problem?
 

EDWW

macrumors member
Original poster
May 1, 2008
31
0
ANd in Audio/MIDI setup, the frequency and sample rates are set appropriately?
It is set at 2 ch 16-bit Integer 44.1 kHz. In the past it would work at a variety of settings.
 

EDWW

macrumors member
Original poster
May 1, 2008
31
0
there have been scattered reports of people introducing unpowered hubs in between their dacs and the mac.

see, for instance

https://discussions.apple.com/thread/7906975
I appreciate your input but I've never used a hub before. I did try running from 10.13 that I have backed up on a separate drive and still have the same problem. It makes me wonder if it's hardware problem. Maybe USB? I have no idea and am afraid I'll have to bring it to the Apple Store.
 

kingjames1970

macrumors regular
Mar 18, 2008
237
438
Hampshire, UK
My Late 2015 27" iMac has suddenly started acting up with my external DAC, an SMSL M8. I now get a stuttering noise as well as each channel cutting in and out and the the DAC disappears from the sound tab in system preferences and then nothing. The DAC connects to a USB port. I tried all the ports I also tried a Nuforce UDAC-2 with same results however each DAC works fine in a different computer. I don't have any problems with sound through internal speakers.

Prior to this for a number of weeks I was having a big problem with my Bluetooth mouse and keyboard staying connected which finally mysteriously resolved all by itself. Now this...

I've tried PRAM reset, SMC reset and neither made a difference.
Hardware problem?
I used to have a similar problem with my MaBook Pro but my Scarlett worked fine attached to my iMac Pro. That is until Mojave when it started the stuttering again. I’m hoping a Mojave update will fix. Hugely irritating.