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Wow, no one giving the old school "add a capacitor in series with the speaker leads" answer. You will need two capacitors. Each will go on one of the cables to/from the speakers. You can place them in the trunk where the wires go to the speakers in the doors. One capacitor per speaker and it does not matter which of the two wires you put in in line with. (Amp -> Cap -> Speaker) A 400 micro farad capacitor will remove anything below 200 hertz from the door speakers. If you want to cross it over at a lower frequency you can get 120 hertz and up with a 660 micro farad capacitor. The higher the frequency you cross it over at the less rattle; however you will also be removing some of the sound frequencies that you normally hear also. Most sub amps can be crossed over to 120 hertz and below so that may be a good place to start if you are just adding the sub and amp. Old School for the win :-)
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