I re-reinstalled a Denon that I originally installed in 2008 for someone (third home, for this one) in a family room that has wooden beadboard walls & ceiling and ceramic tile floor, but it also has a big sofa and rug. It's also an irregularly-shaped room and because he didn't want to go nuts with it, I used the existing cheesy Sony HTIB speakers and sub, but added a pair of Jamo in-wall speakers and omitted the center because of the wall framing on the wall with the TV. The fronts sounded pretty good on their own, but the overall sound wasn't very good until I ran Audyssey. This is probably the most dramatic improvement I have heard with cheap speakers and the version of Audyssey with this AVR is, by comparison, ancient.