Do you have designs for the very large 30 hz 10 pi's? If so please e-mail them to hot455ho_79@hotmail.com. If not please elaborate on drivers and spl performance at low frequency. One more quick question, how does a corner horn use the ceiling as a part of the horn design? Seems like they would only get benefit from the walls and some from the floor. Thanks again! You must be one busy dude, I see all the replys all over this forum and a couple of others!