Tom, if this thread is still alive and you still happen to be monitoring it, may I ask if you have made any progress with the SM-60 home version with integrated LF section? I would be very, very interested in purchasing such a speaker. If you haven't then I am still equally interested in purchasing SM-60's and appropriate subwoofer's for a home media/music room.
Tom
Call this a bump. Search for a serious Horn speaker has conducted me to your design. Would like to see you post here again! I am reiterating avnutz query here!!!