How deaf do you want to get? Bear in mind, more bass you pump, more power your gonna need to power the door speakers to get decent sound. in my experence 15s throw lower, but 4 of them in a rig the size of an explorer? Not trying to criticize. Also make sure the RMS of your amp and subs. RMS is the true wattage output, not what it says on the unit itself, make sense?