Connecting an Audigy ZS to a Preamp for surround

From reading about your card in newegg, it supports EAX, which your games use, and dts surrond, which most dvds have. It'll decode most of what you need. Now what I don't know about is what format info is sent through the optical cable in. Someone was telling me that optical is encoded in dts, and the receiver has to decode it. But in that case, why ever make a receiver with an optical input that couldn't do decoding? I think it should work.

"It's too late now anyway. That song is stuck in my head and the only way to get rid of it is to blow it out. With a bullet!! - Carl