[bpape]

The first thing I'd consider is moving your seating. Sitting against a wall is going to give you all sorts of problems.

As for treating the room, it's not hopeless. Yes, treatments are somewhat large but don't have to be ugly by any stretch. Creative arrays and orientation of treatments, careful selection of cloth, etc. can make them actually look like part of the decoration.

Are you going to get it perfect? Probably not. That's a tough room, very out of symmetry, etc. But, you can certainly really improve things.

As for the sub, I'd agree it likely needs to be replaced. That's a large space for that sub to try to fill. Something like an HSU VTF3 MkIII or an ACI Titanwould have a much better shot. But to a certain extent you're correct. Until you fix the seating issues and tame the decay times down low, a bigger/better sub is not going to be noticed as much nor is the impact of the bottom end of the Ascends as it's being masked by very long ringing in the low frequencies.

Bryan