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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
https://support.apple.com/kb/SP505?locale=en_US
Audio. Combined optical digital audio input/audio line in (minijack) Combined optical digital audio output/headphone out (minijack) Built-in speaker; Storage. 120GB, 250GB, or 320GB 5400-rpm Serial ATA hard disk drive 4
Mac Mini microphone and audio issues - Apple Community
https://discussions.apple.com/thread/2797163
For most of them, under the "Audio" subheading, you will see a line that says, "Combined optical digital audio input/audio line in (minijack)." "Audio line in" refers to the "line level" analog audio standard, perhaps the most widely supported audio standard in existence. The jacks on almost all analog audio devices operate at line level.
Detailed System Specifications Compiled by OWC
https://eshop.macsales.com/tech_center/system-specs/MacBookPro2009.06_13/
Combined optical digital audio input/audio line in (minijack) Combined optical digital audio output/audio line out (minijack) Supports Apple Stereo Headset with microphone; Speakers | Headphones. Display / Monitor Capability. 13.3-inch (diagonal) LED-backlit glossy display with TFT technology 1280 by 800 resolution at 113 pixels per inch with ...
MacBook Pro 15" Unibody 2.53 GHz Mid 2009 - iFixit
https://www.ifixit.com/Device/MacBook_Pro_15%22_Unibody_2.53_GHz_Mid_2009
Combined optical digital audio input/audio line in (minijack) Combined optical digital audio output/audio line out (minijack) Battery and power: Built-in 73-watt-hour lithium-polymer battery; 60W or 85W MagSafe Power Adapter with cable management system; MagSafe power port;
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