I also have the k2 power 6 1/2 components up front. Focal, in my opinion, is the best sq speaker in car audio. I have mine running passive right now with the focal crossovers and the sound amazing. Best car audio system I've had so far. I will be changing the focals to an active system soon because I bought another amp.
Amps are all JL (xd 700/5, xd 600/1, xd 200/2). Sub is a JL 10tw3 in a custom box running off the 600/1. Factory Sony/nav headunit and I got it all running through an audison bit ten processor.