My home theatre system doesn't have a stand-alone amp as such, instead my 'receiver' is a Sony mini hi-fi component system (the MHC-NX3AV) which is hooked up to my DVD player and provides me with 5.1 surround sound. On the back of my receiver is a port labelled 'Digital Out - Optical' which I assumed I could connect to my xbox via the Advanced Scart pack with an optical cable and get 5.1. But it doesn't work, I get no sound at all. I enabled dolby digital in the xbox settings menu. There are no other digital ports on my receiver. Is my system not designed to get 5.1 from my xbox, do I need a 'proper' dedicated amp? I assumed that because I could get 5.1 from my DVD player I should be able to get 5.1 from xbox too - is this right? So I basically need to know whether the cable or xbox may be faulty, or if my system just isn't able to accept 5.1. Can anybody help me, I'm fairly new to home theatre. Thanks.