It all depends on how your set-up is. Many things play an important role, which can make or break your system. I mean if a certain speaker hit "x" db everytime, then manufacturers would use it to proove that their sub is better than the competition. I wouldn't doubt if they can hit 145db, given the right installation.
MTX doesnt ****!!!! Its one of the best car audio systems in the market... there are many factors why you only hit 130 with MTX, boxes, wires and other configuration affect the DB meter... so it will be so unfair if said that MTX suX
lol transfer function , electrical power, tuning you did a 130? lmao!!!!!!!! i did 130's with mtx teminaters and a 400 watt pyle amp back in the early 90's and i know for a fact that us amp kills my pyle..you run them out of phase? lol