Here is what I want to do, this is a styling thing also....I want to build these cabinets 13 inches taller, my question ??? ....What will be the affects if I use (2) 12 inch speakers, if I use (2) 15 inch speakers, or a single 15 inch speaker......If I port the back chamber or leave it sealed.......Thats what I would like to do, I am not ready or have the space for Jubilees, so I'm not going to do that.........Thanks for any help on this Will V