Need help from Guru's

I don't want to waste your time but I need help.I'm using B&W803 for front HTM for center 602's for rear and DC1 version 4 as proccessor.I'm using ATI1505 for center and rear and NAK PA7 for front.Sometimes it sound gorgeous but sometime sthe sound is sterile and lifeless in both stereo mode and AC3/DTS.Listening position is quite far(15-16')and tons of reflection from hardfloor and walls.Could you , please,advise.Considering the speakers and environment which I can't replace,what options I have for amplifiers?Thank you,for your time.
Walther, Please tell us a little more about when it sounds sterile and lifeless and when it sounds gorgeous and what exactly do you mean by those words. Any patterns with regard to HT vs. music use, type of music played, time of day, ect. Certainly tons of reflections from hard wood and walls is trouble. Room is big part of any system (30-50%??) and it's the first place I would start given the little info given.

Frankly, I have never been satisfied with any HT system for music (no, I haven't hearda all of the Agoner's surround systems), and if the room is poor, it can be truly awful. On the lighter side, IMHO, the 803s are very nice and can do a lot by themselves.

Sincerely, I remain
Hmm...I demoed the N803s, and found that they indeed need a good dozen feet to cohere. So you've got that part right.
However, I found the tweeter to splash easily, so I imagine you've got to treat your room's reflection points carefully and aggressively.
Good Luck.