Ok I got a Alpine Type R 6 1/2" component system, an Alpine Type R 6X9, and a Alpine 9856 HU. I installed the HU and that is all fine (except the Scosche kit does NOT work in 05 Xterra's). Now for the speakers, I am going to put the 6X9 speakers in the front but use the tweeter and crossover included in the 6 1/2". Has anyone done this before because there is a positive and negative connector for the front speakers and I have no idea which wire is positive or negative! [Uh Oh !] Thanks