Well, what a weird weekend. Sorry guys, I think I owe you a little apology, must have been on drugs with this thread. In short, I'd started off using what seemed like a logical process to improve the system, but completely missed out on a sanity check along the way. Post my stereo only DVD test I sat down with the missus to watch "Clear and Present Danger". The opening sequence is a very atmospheric point with a coastguard ship plowing around in the Atlantic. Listening to it in stereo, it was clearly missing some ambience, despite being detailed and well presented in stereo. So, the AV amp was reconnected along with the rear and centre speakers. Sure enough, the ambience was terrific, more than making up for the stereo side of things. So, apols guys for wasting your time. You were dead right and I really must have been taking some odd narcotic without noticing during the weekend. My system is now back to full 5.1 channel and I promise not to talk such drivel in future.