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Nigel66NP12 Author

Level 1

8 points

Toslink

Running Big Sur OS on my iMac (Retina 5K, 27-inch, 2020) will play sound through internal speakers and headset. It will not play through a Toslink plugged into headphone socket ? Ideas?

iMac 27″, macOS 10.13

Posted on Mar 23, 2021 7:48 AM

Top-ranking reply

den.thed

Level 10

83,230 points

Posted on Mar 23, 2021 8:12 AM

The latest iMac’s with a single headphone jack, no longer support optical digital output.

You will need to get and use a USB to optical digital adapter or a USB DAC that supports optical digital output.

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Toslink

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