I think I’m becoming a believer in dipoles. My setup isn’t even close to ideal yet and it’s already making me really happy. I’ve moved the crossover all the way up to 3500 Hz and it sounds amazing even though the mid is pretty beamy up there. The effect is to move the soundstage back. It sounds very natural, smooth and atmospheric, even at low volume. I stayed up too late last night because I could turn it down low enough not to bother anyone and it was sounding so sweet.
As you suggest, I do plan on getting some absorption behind the drivers once I get the baffle standing on it’s own so I can get rid of the old TV cabinet it’s leaning on. I’ve also ordered a ceiling TV bracket so the TV won’t have to be held up. It’s generally recommended to get open baffles 3 feet away from the back wall but I don’t have the space. I’m going to be pushing up against the wall as close I can get away with while maintaining the beautiful sound, so absorption will be critical. Fortunately I work at ASC so we have all kinds of absorbers on tap. BTW, ASC got started specifically on request to build an absorber to go behind a Magnepan that had to be close to the back wall.
I had an idea to use the TV as an extension of the baffle. I might experiment with that, but I have a feeling it won’t be good to make the baffle that much bigger. I fear that will just delay the dipole side cancellation, taking the edge of the baffle too close to the ceiling so it won’t kill the ceiling bounce as effectively. I left the bottom of the baffle open too to help kill some immediate floor bounce.