also you say with the alpine gear that your getting it is an mrpm300 and a sws1222d. that sub is dual 2ohm, you want the sws1242d as it is dual 4 ohm which will present a 2ohm load to your amp and therefore will be given more power to the sub. i have two sws1242d's and two mrdm301(v12 version) amps in my ek hatch and they have recorded 143.9db at Bris Autosalon a couple of weekends ago.
