Can my Mac downmix and forward digital audio?

My Mac Mini (mid 2011) has a line-in that apparently accepts optical input. It also has a high quality sound interface (purchased separately).
My DVD player has a optical output.
My amplifier and speakers are analog and stereo only.
Can I feed the audio from my DVD-player's optical out to my Mac, downmix it on the fly to stereo (would love to keep the two front channels as well as LFE or sub effects) and pump out the resulting signal to my amp and speakers?
The reason: few DVDs have stereo audio tracks included and my DVD player doesn't seem to allow to adjust the downmixing in anyway, as well as sporting inferior audio components to that of my Macs external interface.

Hello,
Not sure, but...
Open Audio Midi Setup in Applications>Utilities, see the input & output options & KHz setting there.

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