I have the Dayton Ultimax 15” in a 3 ft.³ sealed enclosure. I saw sealed boxes wi large llt sonotube hook to an opening that was cut for the tube This makes the box much larger because of the sonotube is so long that it adds measurable volume to the box. The two sunotube also Became a large low turned pors. Everything I am describing can seen on The Nellson pass El Pipo subwoofer. I was wondering If @shadyJ or @TLS Guy @nim.could tell me hi Lennon and 18 inch high Whitney JP June 20 and 18 Hz?