I honestly think you should ditch the dash location, deaden your front doors and make a baffle for the 5.25 in your doors and flush the tweeters into the lower corner of the doors. then you could just leave the rears on the hu power and bridge that 4 channel amp to those components. double your power up front and in proper locations will make you much happier in the long run. also figure out how to get the sub your installing into a back corner.