Opening a wall to the next room helps with standing waves and sometimes enhances the rooms appearance in the process.
We have three large openings in our listening room and the sound system is set at a diagonal to the parallel walls and the ceiling is cathedral so there's little to no direct reflective surfaces as everything is at angles to each other; fluid dynamics. The point, turn your system to angles and opening up walls is also a possible consideration.
Hey Dad, how 'bout we cut a hole in the wall to make the bass better?
Hey son, how 'bout we just open the door?