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

That is so fascinating using all different kinds of subwoofers. Is there any downsides to this? Do they have different speed or timbre?

Right now they are about 10 inches off the wall and they probably need to be moved out more.

@smodtactical  If your bass is rolled off, you're usually better off moving the speaker closer to the wall behind it. This is particularly true in the case of a sub- as it gets closer to the wall, the boundary effects start to come into play. So the bass goes up not down. But standing waves will also be more pronounced, so you should try the sub pointed in different directions, with different phase and in different locations along the wall if you can. The right spot might only be a few inches wide so if you're playing with a single sub this requires patience!

@atmasphere  Does subwoofer direction make a difference since the waves are omnidirectional below a certain frequency?

Yes! It might make a difference between a standing wave or none- at your listening position.

These are the ns 5000? Excellent choice. I really appreciate what Eric is suggesting. I have a 6’x8’ piece of carpet hanging on the sidewall of my listening room, it helps. One day I may replace it with vicoustics or another brand, but it showed me how important taming that 1st reflection point is.