So, I watched Jumanji yesterday, and I was just not satisfied with how my Lfm 1 plus was doing. I strongly suspected it had a lot to do with the floor it's sitting on. Living in the SW we have saltillo tile on concrete, and I felt it was causing the deep bass to muddle a bit.
I played around with my crossover settings on the receiver, and still settled on my mains set to large and crossed over at 50 hz. I have a pair of Polk monitor 10b's, and when I set them to small or cross them over at 80, I just feel I loose to much lower mid/upper bass that they do better then the sub ( Polk specs say they don't roll off till 37 hz). Although I'm sure if I was using bookshelves, I'd feel differently
Saltillo's are not a smooth level surface, and I could never get the sub completely stable to my satisfaction on all four feet, so I put a couple of 3/4 wood furring strips the length of the sub under the spikes, and that did a good job of stablizing it. I played the malestrom scene in Pirates of the Carribean, at Worlds End, (my reference scene right now) and It helped, but it still seemed a bit undefined, so I put a bath towel under the sub. That muffled it a lot, to the point that it took away most of the impact. So, I put a much smaller kitchen towel under the driver, and that is the ticket.
Now when the cannons fire, I can hear each cannon fire individually much better than before. It seems a lot less just a blended LFE scene, and now the various explosions and crashes are pretty well defined. I'm going to try a couple of more settings, along with some other stuff as damping material under the driver, but it has made a real difference.