Dolby Digital 5.1 Output Options

[nikonlarry]

I want to be able to play a DVD with 5.1 sound at a banquet. Created with Apple Final Cut Studio. I have a MacPro and can run the output out the optical cable. Just don't know what to put between the Mac and the speakers. I assume I will need say, 5 amps. I can do this at home with a 5.1 home theater receiver. But I don't think think the home receiver will work for a large room. Maybe I could take the output into a mixer with pre-amps and then to the main amps.

I can't find any information searching for this type of setup. Any help will be appreciated. thanks larry