Bluetooth mono only

Discussion in 'Mac Pro' started by loadedmind, Feb 21, 2017.

  1. loadedmind macrumors newbie

    loadedmind

    Joined:
    Oct 8, 2009
    Location:
    Planet Earth
    #1
    This one is a bit strange. First, hardware specs:
    Mac Pro Mid 2010 12-core w/ 16GB RAM running 10.11.6
    Bluetooth headset (https://www.amazon.com/gp/product/B017H4LSN4/ref=oh_aui_search_detailpage?ie=UTF8&psc=1)

    While playing YouTube videos, only mono output, not stereo. However, if I open Sound Preferences, sound magically changes from Mono to Stereo, without modifying any settings. :rolleyes: Anyone have a suggestion? It only started doing this a few weeks ago.
     
  2. Jesla macrumors 6502

    Jesla

    Joined:
    Jan 7, 2013
    Location:
    Tennessee USA
    #2
    Pram Reset

    Here's how to reset your PRAM:
    1. Shut down your machine. Yes, all the way down, not sleep or logging out.
    2. Press the power button and then press command-option-p-r. ...
    3. Hold those keys down until your Mac reboots again and you here the startup chime.
    4. Let go of the keys and let your Mac reboot normally.
     
  3. loadedmind thread starter macrumors newbie

    loadedmind

    Joined:
    Oct 8, 2009
    Location:
    Planet Earth
    #3
    I did this twice last Thursday. I'll do it again just for good measure and report back results. Also repaired permissions a few times last week too. Thanks for your reply.
     
  4. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #4
    Bluetooth has many protocols that it can use to connect with a device. Headsets typically connect with two protocols:
    • HSP (headset profile) which has low latency, one speaker (mono), and one mic. This is meant for 2-way communication.
    • A2DP which gives up the mic for two speakers (stereo) and higher quality. This is meant for stereo audio output.
    Probably your headset has connected with both profiles, but the HSP as default. I haven't had this happen on my Mac, but I have experienced the problem in my car. The fix was blowing away all bluetooth settings/pairings/etc and pairing again as new.

    If you want to completely reset all bluetooth settings, hold down SHIFT-OPTION while clicking on the bluetooth icon in the menu bar. You'll see a debug menu which has some reset and remove options. But ignore that for now and click on the headset. Now it should have some remove/reset options.

    Try that first before going to the debug menu. The debug menu blows away all bluetooth devices, so you would have to pair all of your bluetooth devices again.
     
  5. loadedmind thread starter macrumors newbie

    loadedmind

    Joined:
    Oct 8, 2009
    Location:
    Planet Earth
    #5
    Jesla> Thanks for your reply and info. I reset the PRAM and no joy.

    ActionableMango> I first tried your suggestion to reset the Bluetooth device, then re-paired it and no joy. I then reset all Bluetooth and rebooted. Still no joy. What's so very strange is that if I bring up System Preferences->Sound, the sound goes stereo. If I leave that window open, it stays that way. The minute I close it down, it goes back to Mono after 1 or 2 seconds.
     

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