Hi Mike, How are you? I've been on speakerplans for the longest when are your plans coming out,I've been seeing this plans with the two measurements and still waiting for the rest I'd like to build this sub but only to 80-100Hz. Bill Fitzmaurice has a Snail II cabinet with a JBL 140E and can reach I believe to 400-500Hz it is also a folded horn. I think your horn is easier to build than the Snail II from the way it looks, no offense Bill.