you may as well hook them up and see what happens, but movies are mixed very differently than music cd's, with exaggerated bass and a unique way of adding voice tracks that can be heard (but only with the volume cranked way up).
i have a cheap but good Sony (self-powered) surround system i purchased for $600 with rear speakers, built-in subwoofers, and a built-in center channel. it sounds amazing on Lord of the Rings but not so great on Stevie Ray Vaughn. it has a remote with a number of different ways to equalize movie sound but doesn't have the right controls for 2-channel audio. you may have the opposite problem with the 805's- either not a good foundation and/or difficulty hearing dialog. perhaps a graphic equalizer would be helpful in this regard.
And then again, you may find that the sound-bar is immensely satisfying with the TV on regardless of how it plays music, which leaves you with a tough decision to make regarding those wonderful 805's.