My situation,as it exists, may be inferior. My speakers are also along the long wall, but are stuffed toward the corner of the room, with a fireplace hard against the left side.(for added reflections, thank you) My seating location is is about eleven feet from the speakers. About eight feet back in the old room. Even had great imaging in the old room-not so good in this one, not even for the M50s. Both rooms had a fair amount of space to the right side, this room has a few feet more. In both cases the speakers are/were about eight feet apart.

In this environment, my poor M3s were unhappy puppies indeed. The M50s on the other hand really like to sing here, even louder than I care to listen!

Now if I can just find that "Moose Head For the Fireplace" acoustic enhancer...