I have a 2015 jeep grand Cherokee with the Alpine 506 watt 9 speaker system. It's pretty sub part sojnding. The front doors are 6x9's, rear doors are 6.5's1 in tweets in the A pillars, and a 3.5 center. It has 8in sub and 2 2.5 int rrar pillars (not worried about them). The factory amp has a 30...