Okay, I have a cab that is virtually identical in dimensions to an S-15B (2 cu. ft.). At present it is sealed but my thoughts are to cut a rear port like the Bag End and load it with a Neo 15" My goal is to have a second small cab to compliment my G-K Neo112 for gigs that require a little more oomph than the single twelve. A few months ago acouple of TB speaker gurus advised me on port size using a JBL E140 but I really want to go with a Neo if possible. Any suggestions?