You're right about taking the false corner to the ceiling. In this way both the K-horn and the TacT sub will have three reflective sides. The K-horn will have the two false walls and the floor, while the sub will have the two false walls and the ceiling. The false walls will be made of two layers of 3/4 inch high density melomine particle board glued together to eliminate any resonance. Each side of the false walls will be 3 and a half feet long. With this arrangement I'll be feeling organ music, not hearing it. Thank goodness for the Isowall treatment. Rives, I guess I'll need your bass correction devise to make sure the bass remains flat.