I am planning on 340s LCR. I am considering going 340s all around. I am pretty sure that I'm going with a SVS 20-39 PCi. The room is about 19x15x9 and open to one side. The surrounds are forced to be mounted on the rear wall. The seating position is about 2 feet from the back wall. Should I go with the 340s or something smaller? Should I not go with ascend for the surrounds and go with a quadpolar instead?