Thanks for your review. I have M22s an use to have them a foot or so away from the back wall. In that location (in my room) the bass was pretty anemic. When I wall mounted them recently, and consequently located them much closer to the back wall -- the rear ports are about 3" from the back wall -- the bass is now much fuller. I hardly ever listen to them without the EP500 in the mix, so it's not a big issue for me. Mid-bass did receive a nice oomph, though.