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Coaxial and optical are both digital audio transfer mediums, i.e. they carry the same number of channels just transfer the data in a different way.
Multichannel audio, it is at least 5.1, i'm not sure about 7.1 but there is still a ways to go before 7.1 becomes a standard.
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Brian Griffin: Ah, if my memory serves me, this is the physics department.
Chris Griffin: That would explain all the gravity.
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