My theater room in my basement is very long and skinny. (50'X11'X7.5') I use the north half for my theater and the south half for ping pong with a 2ply black cloth divider in the middle. I was wondering what if building a wall to replace the black cloth divider would increase bass output in the theater or not. If I were to build a wall then I could put the sub by the back couch against the new wall if you think that would help. I havn't tried placing the sub behind the back couch yet but that might boost output a little. If any of you guys have any ideas on what I could do BESIDES putting in a wall let me know. otherwise I might have to make a wall. I work at a sawmill so lumber is free, but the other materials aren't. please view the attatchment that I worked so hard to make in paint! thanks

By building a wall, you would make your sub more effective by making a space that is much smaller to fill with bass. If you go that route, avoid creating a dimension that is a multiple of any other room dimension. In other words, don't build the wall at 22' (2x11) or at 15" (2x7.5'). This way you will avoid creating a condition that causes standing waves and sets up a series of bass peaks and nulls in the room.

Without building a wall, you may be able to make your sub more effective by re-locating it near the seating area which tends to give more impact.