why don't you just buy some dampening material and fill in the gaps around the driver to isolate the rear wave from the front wave also use some adhesive foam strip to make sure the driver is sealed to dash. then see how it sounds. you might be happy with the way the speakers you already have sound. keep in mind the dash is pretty open at the bottom so there will be cancellation as it is not an ideal enclosure.
you also tend to say something like cost don't matter its quality and then ask for the best of something which you've already know is subjective. stop acting like a troll.
you also tend to say something like cost don't matter its quality and then ask for the best of something which you've already know is subjective. stop acting like a troll.