Alright guys. So I have a 2003 Hyundai Tiburon hatchback. Right now I'm running a hifonics 2400 amp and an hdc3-18 subwoofer in a little more than 6 cubes ported at like 35 hz. Stock 110 alternator, big battery, volts hang out around 14 when it's beating. Now let me tell you, this 18 POUNDS in...