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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.
iMac (Early 2009) - Technical Specifications - Apple
https://support.apple.com/kb/SP507?locale=en_US
Audio line in/optical digital audio input (minijack) Built-in microphone; Support for Apple Stereo Headset with microphone; Software. Mac OS X v10.5 Leopard (includes iTunes, Time Machine, Quick Look, Spaces, Spotlight, Dashboard, Mail, iChat, Safari, Address Book, QuickTime, iCal, DVD Player, Photo Booth, Front Row, Xcode Developer Tools ...
iMac (20-inch, Mid 2009) - Technical Specifications - Apple
https://support.apple.com/kb/SP616?locale=en_US
Audio. Built-in stereo speakers; Internal 24-watt digital amplifier; Headphone/optical digital audio output (minijack) Audio line in/optical digital audio input (minijack) Built-in microphone; Support for Apple Stereo Headset with microphone; Environmental Status Report. Arsenic-free display glass; BFR-free; PVC-free (internal cables)
iMac (27-inch, Mid 2010) - Technical Specifications - Apple
https://support.apple.com/kb/SP695?locale=en_US
Audio. Built-in stereo speakers; Two internal 17-watt high-efficiency amplifiers; Headphone/optical digital audio output (minijack) Audio line in/optical digital audio input (minijack) Built-in microphone; Support for Apple iPhone …
iMac (21.5-inch, Mid 2011) - Technical Specifications - Apple
https://support.apple.com/kb/sp623?locale=en_US
Audio. Built-in stereo speakers; Two internal 17-watt high-efficiency amplifiers; Headphone/optical digital audio output (minijack) Audio line in/optical digital audio input (minijack) Built-in microphone; Support for Apple iPhone headset with microphone; Connections and Expansion . One Thunderbolt port
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