you absolutely can. the key is properly deadening your door and sealing it up, almost making it act like an enclosure, It obviously wont extend as low as a subwoofer but you can get a serious amount of output. Theres alsothe option of using an 8" midwoofer and trimming the sheet metal on the door. You are however going to need to feed a solid set of mids a good amount of power.
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