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I would like to output all system audio as mono in OSX.

Following this answer, I tried checking the "Play stereo audio as mono" option under the System Preferences > Accessibility tab, but it has no effect.

I have a 13-inch late 2008 Aluminum Macbook that I have upgraded to El Capitan 10.11.2. This Macbook model would have come bundled with Leopard, but apparently the mono audio feature was added in Snow Leopard.

So I suspect the problem might be that my old audio device doesn't support mono output, but post-Leopard OSX has an accessibility option because it is designed for newer machines that do support mono audio.

Can anyone confirm if this is true? If so, is there any other way to produce mono audio output on this old Macbook?

Community
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willpett
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2 Answers2

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Try to go to the Universal Access or "Accessibility" system preferences. In the audio section you will have an option to play stereo audio as mono. You need to check this box, and your audio will be played as mono.

Tim Stuart
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Was having this same problem and got it to work by checking the box on, then restarting my computer and reconnecting to the bluetooth speaker I was using.

Hopefully you've figured this out in the last 3 years but maybe it'll help somebody in the future.

Adam
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