I'm hoping you can help me extract the maximum sq from my current build. And by sq i relize its not competition sq lol. I have a set of jbl p660c (very high reviews on diyma) that will be ran passive on a zapco st-2x at 2 ohms. The mid will be installed in the factory location with deadener and ccf of outwr skin and inner skin will be sealed with deadener to seal off the door. I will also be using the FAST three piece acoustic ring kit and making abs adapters like mark at caf did. The part I am needing help with us where would be the ideal location to mount the tweeters. It's a 99 grand am but I can do glass work if need be. The second question is should I high pass at 60hz or 80hz?