I just had my rear door speakers replaced with JBL GX628's, and noticed a tremendous improvement in sound quality (low's, mid's, and highs). I'm now investigating options to improve the sound quality of the front door speakers, and trying to figure out a solution for the 8", 3", and 1" setup that currently exists. I'm thinking of using 8" subs for the doors (possibly shallow-depth), 3.5" inch midranges?, and a 1" dome tweeters. I'm guessing that the subs would have to be powered by a separate mono amp, but I'm hoping that my App Radio 4 HU could power the mid's and tweeters. Any suggestions or pics of aftermarket setups would be appreciated. Thanks!