I'm planning to have don build me a verticle cab with a kappalite 3015 3015LF, 2 avatar spec neo 10's and an eminence sealed back 8". My plan would be to have the 15" in it's own chamber, ported accordingly. The two 10" and sealed back 8" would be in the other chamber together, ported accordingly. I would use and eminence pbx:800 crossover, running 800hz and below to the 1x15 and 2x10 paired as a 4ohm load. 800hz and up would go to the 8" for my top end. I currently use a cab with 3x10's and 1x8 with the same crossover. I figure that adding a 15" and making it all verticle would be a good step forward. Any opinions or ideas? Should I go with the 3015 or 3015LF for this rig? Dimensions, porting, experiences. I would of course have done figure out the porting and depth of the cab. Would a pair of 8" be too much top end? Having 2x8" was a consideration if they were placed side by side at the top of the cab, like a pair of big eyes on top of a snowman. Thats how it would look I guess.