After upgrading SSD and traveling with my Macbook Pro and traveling while low temperatures outside (I don't know if this is relevant).

When I connect headphones the sound on the left one is significantly quieter.

Is it connector problem or not ? Should I try to put something to the hole, and bent a little bit connectors ?


I found out it was volume setting problem, that could be changed in "Audio MIDI setup"

Plug in the headphones (if there is problem with headphones - if problem exists when using internal speakers, don't plug headphones)

Find in Spotlight "Audio MIDI setup" app:

Results from Spotlight

And open app :

Audio MIDI setup app, wrong settings

Make sure that channel 1 and 2 have THE SAME volume set up. Set every channel to value "1" as here :

Audio MIDI setup app, appropriate settings

I have no idea how this disproportion in volume happened. But I would like to know. (I haven't tinker with volume before - except simple volume up/down via headphone control or keyboard's function keys)

This answer is based on the "The Hefster's" answer from :


The Heftster's answer from Apple Discussion page (I post screenshot because https://discussions.apple.com doesn't support linking to stand alone posts)

  • This is awesome. I had something similar happen and it took quite some time to figure out why one channel was attenuated. – bmike Apr 1 '14 at 17:31
  • If anybody would be able to "extract" problem, it would be nice to post it to bugreport.apple.com – Paul Brewczynski Apr 19 '14 at 2:37
  • For what it is worth: setting the two channels to the same value sounds a little off to me. Your 18.5dB difference is pretty big, but after listening to a few tracks I settled on a 3dB increase on channel 2. (all proper disclaimers about your milage may vary etc. &c. ) – dwightk May 21 '14 at 16:23
  • 4
    You are a saint!!! I thought I was going crazy / losing hearing. – Wes Johnson Dec 1 '14 at 22:35
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    Notice that you can achieve the same effect by changing Settings->Sound: Balance. Also, to quickly exclude hearing impairment as a cause, wearing headphones upside down with right/left switched is a simple test. Finally, encountering the same problem on two different Macs (with balance always at neutral already), let me trace the problem to just headphone plug/cable--unless MacOS does something weird cross-machine... – marco Oct 31 '17 at 13:19

Weird solution but it worked for me. I noticed one of the 'holes' of my right EarPod played sound a lot softer than the others did. In my rather desperate attempt at getting it to work properly again, I tried blowing and sucking in to it. It did the job, hopefully it will for you as well.

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