Need some education on xbox and 5.1 sound (1 Viewer)

[Scott FP]

I'm still new to all this home theater stuff so forgive me. I have a Marantz SR4000 receiver.
I ordered the HD AV pack for Xbox because I have component inputs for my Sony Wega and I have a digital optical in on my receiver. Keep in mind that I don't have the Xbox or HD pack yet.
The Marantz receiver displays the following: AC - 3 3/2.1, I'm supposing this isn't 5.1 surround sound or is it?
I have a DVD and VCR hooked up to the receiver. There isn't a choice for AUX. So could I use the satellite option and assign optical to it for the Xbox sound?
Thanks for any help. I'm just trying to eliminate any obstacles to hooking the Xbox up when I get it.

 

[Joel Mack]

3/2.1 is the same as 5.1, yes.
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