Blew a speaker in my bassman 50's 2x15 cabinet yesterday. Measured the internal volume and intend to do some speaker shopping. The internal volume is about 3.75 cu ft. Much too small for the 2x15 that it was. I want to do a single 15 lfc and at least a smaller mid bass driver. I dont want to do to much deconstruction or reconstruction and need to use an off the shelf passive crossover. I hope to either find a suitable sealed back mid driver or convert the vacant 15" opening to a small sealed area for the mid driver but that would eat up about a full cubic foot. My budget is $200 so i am considering the eminence alpha line. I figure the crossover to be $50 so the remainder will have to be split between the drivers. Please suggest the following: Driver combo Tuning freq Lfc port diameter and length Thanks for your input.