If you don't re-use the stock plastic housing to mount the speakers, you can make a MDF panel to mount the speaker in, and that adds more than enough room to mount it in...oh yeah, we are talking about the doors right???
MDF = medium density fiberboard... basically wood fibers glued under heat and pressure. Most people recommend it because MDF is very well damped acoustically thus making it an ideal material for speaker enclosures
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