HD with surround sound

[samsc]

Does anyone have a tips on how to get 6 channels of sound out of a Mac Pro? Any suggested devices? Can the optical output do this?

The task is to play a HD movie with surround sound on 2 beamers, so I was thinking the Catalyst would be good choice.

there are a lot of sound output boxes from the music and audio companies.

there are many multichannel firewire boxes.

I use motu ultralites.
other people prefer other devices.

to get multichannel sound - you need to set the output channel assignment in quicktime player and/or final cut