Lots of bass at walls, lack of bass in center of room/listening position

Hey just made a discovery.

Just played around with the roon dsp, i hit invert on my left channel, and all of a sudden the bass came out of nowhere, was focused, intense and powerful and evenly distributed as I lean left and right. When you turn invert off on the left it weakens and becomes much more diffuse. So maybe i have something wired incorrectly? Only thing is if i leave invert on, i sometimes get some popping and crackling so sounds on the inverted channel.

Actually this seems to collapse my sound stage and squash imaging towards the center as well

i’ve had the EXACT same issue w huge dip at 80-100hz by mandated listening position. completely solved w a smaller driver(very fast) sub. The b&w db1 is a true system changer. it will play at 80-90hz without any detection issues. i place it just inside left speaker. it has several phase choices which are very easy to hear allowing perfect match w mains. in my room 270 degrees is the correct setting for me. neither 0 or 180 worked well. try it as you will be overwhelmed at the seamless integration. 

Try turning the subs down. Like whispering at 40 hz.