Okay, I finally got them connected in the rear, but the sound is very low. I bypassed the rear amp so it's running off the HU, did i connect wires wrong or is the HU just not powerful enough? its a Pioneer DEH-P5200 w/ Kappa 693.3i's in the back. Non bose. Thanks

Edit: If an amp is needed can anyone recommend a cheap, amp, and what would be good to power this setup.