I have a Sony CT550W soundbar mainly for the HD decoding and HDMI inputs. It does alright with most movies but not all. Would going to a 3.1 system get me enough improvement to make it worth it? I have a pair of Polk TSi400s from another system I used to use. I was looking at the Denon 1713 and a Definitive Technology CS1000 center channel speaker due to its clearance. I dont have any practical way to mount surrounds so they are out. Has anyone tried it? The AudesseyXT should downmix the surrounds through the fronts right?