so, I've started my F20 build. which is really 18.5 inches width. 3/4 inch ply on each side brings the width to 20 inches, hence the F20. In another thread we were discussing potentially bringing the width of the F20 to either 24 or even 30 inches. this would allow a better and more efficient response at the lower end of Fc low. So I've started my build. I've decided to build an f25.5 if I can call it that. 24 inches inside horn width, with 3/4 inch ply on each side. F25.5. I decided on using 24 inches rather than 30, because that is the most efficient use of three sheets of plywood. a 30 inch unit would have left me with to much wastage. I am using the Dayton Audio RSS390HF-4 15" Reference HF Subwoofer 4 Ohm. One of the baddest @ss woofers I've seen in a long time. I bought two of these a while ago for a dual F20 build. which might turn into a dual F25.5 build. Its a pretty easy build really, just takes some time, that's all. and im not in a rush. I ran all the plywood through the table saw to get everything the same width. so no issues there.
My question is, with the wider width, could I have used Dayton Audio RSS460HO-4 18" Reference HO Subwoofer 4 ohm and been able to get a better response? 18 inch rather than a 15 inch. Theres no turning back now, but i would figure that the 18 inch driver might give a better response? and move more air?