I had a similar system and room as what you listed. 1st of all, you need to check speaker placement so that "ALL" speakers are angled towards the "sweet spot". Then you need to setup your speaker config and then adjust the output levels on your Lexicon. Now, in order to do this you will need a "Sound Level Meter" (this can be purchased at Radio Shack). I would have the center channel up at least 3-5 db's higher than the mains. Question: Why don't or aren't you using side speakers? Your Lexicon is setup for a 7.2 (7-speaker, 2-sub) system, if used, this would definitely add to your soundstage, especially with DTS encoded music disc's. Lastly, if you don't have a sub (with your equipment, the Sunfire True Sub would be a reccomendation), this would be very beneficail in getting the soundstage you require. Hope this helps.
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