I have a 2000 jeep grand cherokee limited 4.7 I'm running a autotek 330mxi amplifier pushing 3 kicker comp cvr dual 4 ohms I raised the ohms on each sub to 8 ohms when the all met they dropped to 2.3 ohms I'm running a 3 farad cap and a 0 gauge wire coming from the battery added extra wire for the ground on the battery but when it drops my volts drop to 10 with the quickness