@davekayc I'm fighting a bass null at the sitting position so I wondered about, having the mains spread further apart but toed in at a steeper angle to limit low frequency waves going straight at the wall and being reflected back. Basically having the very toed on speakers sending low frequency waves at the rear wall at a steep angle vs nearly head on to negate the null.
Unless I move at least 38% of the way into the room (better at 50%) I sit in a mid bass null. I always thought the speakers were bass shy but the sub I've been messing with has the same issue so its clearly the room and not speakers. If I mive 3ft to the right of the couch/sitting position which puts me in front of the hallway entrance the sub is delivering THUNDER. Move back to the sitting position and its a little warmer at best.
Right. Same here. Same everywhere. Exact same situation in my room.
The solution is, first move the main pair and seating position around listening for smooth but not necessarily deep bass. Just try and avoid the worst spot, basically. The bass we will fix later. Then at this point get very precise in tweaking placement for imaging. It is essential at this step to get the speakers exactly equidistant and toed in perfectly symmetrically. Finally, add four subs, one on each wall, wherever they can go but preferably no two the same distance from a corner.
What you will find, any single sub or speaker does exactly what you heard- lumpy uneven bass. Moving around only moves the lumps around. Adding more however creates lots of lumps that all together average out to really smooth. The wavelengths are so long and we hear bass so much differently that it hardly matters where they are, but it does matter a lot how many there are. So use more and the problem solves itself.