This amp has everything you need to upgrade from a factory system. To Neils From Gaithersburg, Maryland: of course 150watts to your sub is probably not enough power to match your speakers. This amp was meant to be hooked to a sub/subs at 2ohms, to get the full 300 watts out of it. Heck, you can even buy some Infinity Kappa speakers (2ohm impedance) to sqeeze out even more juice. My friend had this amp before he rebuilt his system. For the money, you can't do any better.