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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.
Mac mini (Early 2009) - Technical Specifications - Apple
https://support.apple.com/kb/SP505?locale=en_US
Built-in speaker, combined optical digital audio input/audio line in, combined optical digital audio output/headphone out. Built-in AirPort Extreme Wi-Fi (802.11n) 3; built-in Bluetooth 2.1 + EDR (Enhanced Data Rate) Your Mac mini comes with 90 days of free telephone support and a one-year limited warranty.
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/
Be it analog or digital, the signal is sent as an electrical impulse over conductive wire. Every cable, from the speaker wire on your 1970s turntable to the HDMI cable on your new HDTV, contains wires, wires, and more wires inside. The one standout in home audio/video market is the optical audio cable.
Mac mini "Core 2 Duo" 2.0 Specs (Mid-2007, MB139LL/A ...
https://everymac.com/systems/apple/mac_mini/specs/mac-mini-core-2-duo-2.0-specs.html
Connectivity includes DVI (DVI-to-VGA adapter included) and Firewire "400", four USB 2.0 ports, combined "optical digital audio input/audio line in" and combined "optical digital audio output/headphone" minijacks, a 10/100/1000Base-T Gigabit Ethernet port, and built-in AirPort Extreme (802.11g) and Bluetooth 2.0+EDR.
MacBook Core 2 Duo - iFixit
https://www.ifixit.com/Device/MacBook_Core_2_Duo
Combined optical digital audio input/audio line in (minijack) Combined optical digital audio output/headphone out (minijack) Battery and power: 55-watt-hour lithium-polymer battery (with integrated charge indicator LEDs) providing up to 6 hours of battery life (2)
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