@stereofanboy yea I was totally wrong about the surface area. I would advocate for an 18" if you have the space for the large enclosure and a decent sized listening room
How to calculate cone area
Cone area = pi x (r x r)
/QUOTE]
Except, I don't think that formula is right. pi r squared is the area of the circle that the mouth of the speaker makes. Cone area is the actual surface area of the cone itself, which has to involve the depth - for a Q&D approximation, you can get away with using the formula, but for anything more accurate, one more dimension needs to com into play.
Rich