allright im doing an install on a buddies ranger and he got a kenwood kac-x520 amp. and two kicker comp vr 12 subs. all these ohms numbers and stuff are giving me a headach. i just want to know if i should bridge it or waht. and if i need to run it series or parallel. subs are 400 watt and 7.81 ohms. the amp is a 2 channel 100 watt amp. goes down to 2 ohms. i don't get it all.