Hi. I recently got the RW-12D (cousin) and had a lot of work to get it to sound how I wanted it. Initially, I also had it in the middle of the front wall. Never got the bass I wanted. So, I moved it to a rear corner. Now, it sounds amazing!
Some have mentioned that these subs were designed to be in a corner. Not sure how true that is, but for me, it was like night and day.
So, give it a try...move the sub to other locations and see if it sounds like you want.