Okay that's what I was thinking. I wanted to do the same thing but it didn't seem to make much sense to treat the floor that way. My riser is basically an island in the middle of the room. It makes more sense if it's treating a corner between the floor and a wall.When I asked Bryan about how much trapping I should do for low end, his reply was basically "you can't have too much low end trapping". I also looked into using the riser for trapping, but everything I read gave me the impression that if your riser did not extend from side wall to side wall, you should not use it that way. Unfortunately, that is the case with my riser...