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"Combined optical digital audio input/aud… - Apple Community
https://discussions.apple.com/thread/1060536
Just because a mini-jack is digital does not mean it can support multi-channel sound beyond 2.0. I don't even think it supports 2.1 sound. a DVD (played with Apple's DVD Player or VLC) should be able to send 5.1 AC-3 digital optical audio through the optical min-jack. You're absolutely right Malcolm.
What Is the Optical Audio Port, and When Should I Use It?
https://www.howtogeek.com/241828/what-is-the-optical-audio-port-and-when-should-i-use-it/
Put a $10 optical-to-analog converter between your optical audio out and your receiver, and you’re in business: you can break the audio out of its digital cage and pipe it into any analog device you want: your wireless headphones, your old receiver, your 1990s-era whole-house audio system, or any other system that only accepts analog audio.
MacBook Pro (17-inch, Early 2008) – 21st Century Eson
https://21eson.com/product/macbook-pro-17-inch-early-2008/
Combined optical digital audio output/audio line out (minijack) Input Built-in full-size keyboard with 78 (U.S.) or 79 (ISO) keys, including 12 function keys and 4 arrow keys (inverted “T” arrangement) Backlit keyboard with ambient light sensor for automatic adjustment of keyboard illumination and screen brightness
Convert Optical Out To Analog Audio For TV's or Anything ...
https://www.youtube.com/watch?v=3htbzSAjt_s
Convert Optical Out To Analog Audio For TV's or Anything With Digital Only Outputs (DAC)So you purchased a new TV but you can't connect it to your older audi...
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