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"Combined optical digital audio input/aud… - Apple Community
https://discussions.apple.com/thread/1060536
You will not get 5.1 sound out from any Mac other than a Mac Pro straight from the box. It is the only one out of the box that has a SPD/IF (more commonly Toslink) connector to allow 5.1 sound. 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.
Mac mini (Early 2009) - Technical Specifications
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.
Mac mini (Mac OS X Server, Late 2009) - Technical ...
https://support.apple.com/kb/SP578
Audio. Combined optical digital audio input/audio line in (minijack) Combined optical digital audio output/headphone out (minijack) Built-in speaker; Storage. Dual 500GB 5400-rpm Serial ATA hard disk drives 4; Electrical and operating requirements. Line voltage: 100-120V AC (applies to U.S., Japan, and South America only) Frequency: 50Hz to 60Hz, single phase
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.
Digital/Analog audio output on Intel Mac Mini? - Mac-Forums
https://www.mac-forums.com/threads/digital-analog-audio-output-on-intel-mac-mini.31480/
The Intel Mini can output audio in two ways: 1. Analog, via a 3.5mm minijack connector (stereo) 2. Digital, via an optical digital audio connector If you use analog, there's no way you can get real surround-sound output. Digital output might offer some hope, but you will need some kind of adapter.
Audio Output (Line Out/Optical) on Mac Mini 2018 ...
https://forums.macrumors.com/threads/audio-output-line-out-optical-on-mac-mini-2018.2154745/
You can connect analog speakers or audio-out to the headphone jack (as it's always been able to support). You CAN'T connect a digital cable to it -- the optical-out feature is no longer present....
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