I finally bit the bullet and ordered some 3015's to replace the Cerwins in my Traynor YCV-215 cab. The Cerwins sound great and are in good shape, but I want to be able to pound the crap out of the cab with fuzz pedals and ham fisted playing and not worry about blowing them up. They'll be put safely under the bed to rest for a while. What kind of difference can I expect in the sound? Any boost in volume? The cab is two separate compartments, each 3.1 cu. ft. They're ported with a gap between the baffle and the end of the cab. Really simple port, about 17" wide and 1.5" high.