I think that you will be dissapointed with the sound you will get let alone the roof vibrations that will possibly resonate to the front. The sunroof will probably pick it up and vibate when open. Maybe some capicitors inline with the speakers would do better for you. There are frequency blocking capacitors tha will only allow certain freq to go the speaker of you choice individually. I am not sure of the wattage output of your radio or if you have amps hooked up but it sounds that you do already have what you need it just needs to be tweaked a bit. Coincidently,if you meant that you are lokking for Mid-Bass not Mid-Range as I suspect,you might consider a different speaker in the lower portion of the front doors(one without a tweeter) or if you have one with one already disconnect it and get the capacitors I mentioned before. I hoped this helped. Good luck..
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