Previous 1 2 3 4 5 Next 73 Replies Latest reply: Aug 31, 2015 2:37 PM by intentionMan Go to original post
  • whizz200 Level 1 (0 points)

    Same problem here in Sydney. Sound reverts to right channel when plugged/unplugged into Cinema Display.


    I have the current MacBook Pro 15" Retina and am plugging the 27' Cinema Display via the Thunderbolt connector.


    I've tried powering off/on my Cinema Display, and the problem still exists, every time its unplugged and re-plugged.  Downright annoying.


    Doesn't seem like there's a fix here.

  • lowrykun Level 1 (0 points)

    I have the same problem described. 2011 MacBook Pro with 2011 LED Cinema Display shifts the balance on the sound to the right. I think to myself... Boy this suddenly sounds really bad... and then I realize it's in mono on the right only.

  • JBMedeiros Level 1 (5 points)

    Same problem here.


    MBP 15" 2010 + Led Cinema Display 27".


    Every time I restart or undock/dock the MBP the sound balance goes only to right channel.

  • thehappysymptom Level 1 (0 points)

    I haven't tried the "power everything off, and unplug the cinema display" solution that pmurdie found, but here's a quick apple script I made that opens your sound prefs, changes the balance, and closes the prefs.  You could even make it a launch-at-login item:

  • philip160 Level 1 (0 points)

    I have exactly the same. Mid 2010 MBP, 27" Cinema Display. Sound reverts to right speaker.

  • Level 1 (0 points)

    Awesome, but the file isn't available any longer. Can we make this script run whenever you press Cmd+F2, so it checks that the channel output is balanced?


    I often listen to iTunes on my iMac when on my work MacBook, so having the channels balanced when I can't see what's happening on my iMac would be awesome. (I control iTunes with the iOS Remote app in case anybody's wondering)

  • thehappysymptom Level 1 (0 points)

    Try this link:

    Click the blue "download" button. I'm sure you can do that in apple script, but I'm not sure how.  I've added it as my Login Items, and selected "Hide" so now whenever my computer logs in it does it in the background.

  • Level 1 (0 points)

    Clicking the blue button downloads an EXE. And clicking the other download button returns with this message: '' is unavailable. This file is no longer available because it's identical to file banned because of claim.


    Kinda sketch...

  • thehappysymptom Level 1 (0 points)



    Sorry about that.  The blue button is actually for "Priority Download", which does download some stupid EXE.


    Here are the steps (with screenshots):


    1) Go to:


    2)Screen Shot 2013-02-05 at 4.30.53 PM.png

    click on the gray downloaded button highlighted.


    3) Screen Shot 2013-02-05 at 4.31.04 PM.png



    4) Then double click the app.


    OR, if you'd like- here is the applescript I used:


    tell application "System Preferences"


              reveal anchor "output" of pane id ""

    end tell

    tell application "System Events"

              tell slider 1 of group 1 of tab group 1 of window 1 of process "System Preferences"

                        set value to 0.5

              end tell

    end tell

    tell application "System Preferences"


    end tell

  • ArrowAway Level 1 (0 points)

    I am experiencing the audio channel issue as well - 2011 Apple Cinema display (27" w/display port) and a 2011 MacBook Air (1.7GHz i5) running Mac OS X 10.8.2.

  • Mark Lautenschlager Level 1 (0 points)

    I have a mid-2012 15" MacBook Pro. I have the "balance going right" problem but I do not have a Cinema Display. Not to throw a wrench in this, but the Cinema Display might be a red herring.


    I THINK, although I haven't been able to prove it reliably, that the problem occurs when I plug in my ear buds. When I open System Preferences and move the slider back to the center it will remain there, but eventually SOMETHING is sliding it back to the right.


    Very annoying. Very frustrating to hear nothing from Apple. When a number of people are all having the same issue, it's not mass hallucination--they should at least respond to say they've noticed the complaint and will TRY to reproduce it.

  • LEMusic Level 1 (0 points)

    I have a mid-2012 15'' MacBook Pro Retina display with double Thunderbolt ports. I just realized that the ''balance right problem'' only happens when I connect the monitor to the first Thunderbolt port (next to the power plug).


    When I connect the monitor to the second Thunderbolt port (next to USB port) the balance of the sound remains dead center. So this solve my problem, but the problem with the first TB port remains. It can be a solution if you have the same MacBook model that I have and it is a partial solution while Apple solve the problem.

  • whizz200 Level 1 (0 points)

    That's interesting LEMusic - I have the same MB 15" Pro and you're right, the second Thunderbolt port seems to behave correctly.  Excellent deduction!  I'm guessing thats maybe why Apple haven't issused a software patch - its probably hardware related.  Anyway, for me this works, so thanks.

  • thehappysymptom Level 1 (0 points)

    If it is in fact hardware related (on either the computer or monitors side) then it spans 4+ years of mac hardware, and two different models of Cinema Display (thunderbolt and non thunderbolt).

  • Plazmatyk Level 1 (0 points)

    I'm having the same issue with sound reverting to the left channel. I'm on a mid-2011 11" MacBook Air running 10.7.5. Here's the kicker: I don't have a Cinema Display, I'm using a generic monitor connected via VGA-to-Mini DisplayPort.


    This is just bizarre.