I have a ALPINE 9811, a PIONEER DEH-P7600MP , and a Panasonic CQ-C5410U.. the ALpine have a 4v preout.. pioneer has 2v and the panasonic has a 5v... I want flash and sound quality, i swapped out my alpine 9811 for the pioneer and honestley the sound quality stepped it up a huge knotch. the...