I agree with the thought above. It's just a problematic room for sure.
If it were me: 1) I'd get a soundbar for the TV setup and 2) run stereo speakers to the corner positions on either side of the modular sofa, firing back into the main room. Weird reflections likely because of the walls, but at lower listening levels, might be decent. And that way, you would not need to run cables above the doorway over by the TV to get the speakers further apart for a decent soundstage. 3) I would not use a sub but get smaller speakers that can still provide good bass to about 40hz.
If it were me: 1) I'd get a soundbar for the TV setup and 2) run stereo speakers to the corner positions on either side of the modular sofa, firing back into the main room. Weird reflections likely because of the walls, but at lower listening levels, might be decent. And that way, you would not need to run cables above the doorway over by the TV to get the speakers further apart for a decent soundstage. 3) I would not use a sub but get smaller speakers that can still provide good bass to about 40hz.