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Earphones running quiet on Macbook Pro, any suggestions?

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 craig h 25 Apr 2017
As the title really. I have a Macbook Pro, less than a year old. When I plug earphones in the output volume is now very low, to the point I struggle to hear what's on.

I have gone through the usual diagnostics, tried different / new earphones. Used these earphones in other devices with no problem. Checked all volume settings.

There is no problem with the volume going through the built in speaker in the Mac or when I connect to the Bluetooth speaker. Think this happened about 3 weeks ago and have been scratching my head as to what the cause may be?
1
In reply to craig h:

Sounds like a buggered headphone driver amp, or its power supply, assuming these headphones worked normally in the same socket previously.

No recent OS upgrades?
 Bob Kemp 26 Apr 2017
In reply to craig h:

I seem to recall resetting the PRAM (or whatever it's called now) and SMC can be a solution.

(PS - trying to work out why an innocuous post like this would get a Dislike!)

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