Hey there - I decided just to use the 789 as my computer dac/amp combo (until I can get a DAC). What's the best way to connect my PC to the THX 789. I've looked at a bunch of reviews and forums and I read how great it sounds, but nobody is specific on their connections. My soundcard has optical out...but I don't see optical in on the 789. Isn't it a DAC as well? How do you/would you connect your PC to the 789 without a dedicated DAC?