I'm looking to upgrade the door speakers, the tweeters, add an amp (no sub). I'd like to reuse the existing speaker wire if possible and just T in after the TAU. It looks like there is some sort of passive crossover built-in. Is there a way to figure out what wattage ratio split that passes to the tweeters vs the speakers? Could I run a 2 channel amp to it? I'm not super familiar with componet systems. XR's thread has me interested but he's unfortunately not finished and doesn't look like there's an estimated completion date.