I have owned several PJB products (9B cab, original suitcase + ext, etc). I still have a Double 4 for travel and received a Cub Pro and C2 ext cab in a recent trade. As I have posted before, the smallest PJB offerings are good if one wants the absolute smallest size, or the really nice finish details, or the eccentric look of the smaller drivers...BUT....using many tiny drivers increases the ratio of metal to paper, complexity and cost with zero sonic advantage. 4 of those 5" drivers cannot compete for volume (or projected low end) with a good 112 cab....and will weigh more. The full 240 watts from the Cub Pro into the 4 drivers (combo + ext cab) is about as loud as the 175 watts from my iAmp Micro into my Quilter 10" cab........and the PJB setup weighs almost 40 lbs, which is more than a good boutique 12" cab.