Answers: i know of systems with 6.5in speakers surrounded by the front running full range that could confer you great bass response. especially if you run 2 speakers at each door. but i would recommend using a simple 10" sub contained by your civic. installs easier, less of a headache to hook up. eat up the trunk space but you wouldnt have to ponder on a immensely complicated door install.
but if you want to really do it then i suggest have 2 6.5" speakers per door, run them on full range from a apt amp and install a 5.25in component set in the kickpanels. great nouns, clear bass but it wont boom as much as a sub in the trunk.
if i'm not mistaken, focal sell a 5 3/8 inch sub you could use for your application.
Good deep bass lacking subwoofers is like fishing minus fishing line. It can be done, but is a dull pain.
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Run all of your door speakers rotten of amps. And throw some 6x9's in the rear window hooked up to an amp also, and it will nouns real honest.
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