I've been running the Beta for El Capitan for a while now, but since the OS got officially released today, I feel it's okay to ask a question.

FYI: I'm running the GM.

I have an iMac with a Bose Companion 5 connected through USB. It's recognised perfectly fine, but once in a while, it just seems to stop sending audio over USB and just starts playing on the internal speakers.

This never really happens in the middle of a song or video, it seems to happen between songs/videos, when the iMac doesn't output sound for a while. This can sometimes mean that one Youtube-video plays over the USB-speakers, while the next, which gets started 2 seconds after the previous one, plays over the internal speakers.

OSX still recognises the speakers (shows them in system settings under sound) when it stops sending audio, but it simply won't play. When it suddenly starts playing on the internal speakers, changing volume doesn't work, because the USB-speakers are still selected in system settings. I have to change to Internal Speakers before I can change the volume. If I then wait a little bit and change back to Bose USB Audio, the external speakers work without trouble, until it decides to do the above all over again.

Anyone has a fix for this problem? I have of course reported it to Apple while testing the beta, but I guess they haven't picked it up.

  • I have the same issue and can confirm the behaviour you have described. Unplugging the USB Speaker does not help. Switching to internal speakers PLUS stopping/starting sound (i.e. track played in iTunes) makes internal speakers work (so not a problem with the source), but switching back is not always possible.
    – user150574
    Oct 5, 2015 at 17:07
  • Same issue here. NuForce USB uDac2.
    – songololo
    Oct 10, 2015 at 21:33
  • How is this still a problem... Jeez...
    – Rvervuurt
    Dec 29, 2015 at 12:05


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