Depends on the room layout. I'm set up on the long wall of a 27x15' room. For years I ran 6.1 then 7.1 with rear surrounds even though my couch is against the back wall. When I bought an x4000, I decided to move the rear surrounds to wides and eventually added heights when I bought an amp for my 4ohm mains. With being against the back wall, I've not felt that I've lost anything by removing the rear surrounds, they're just not needed in my room. I still get great effects and panning behind me. If I had a good bit of room behind the MLP, it'd probably be a different story. I get much more use out of the wides. The heights don't seem to do a whole lot. I love NeoX and use it for everything but music.
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