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Answering questions individually:
1. Subwoofer: The lock box in the floor of the trunk is a good "out-of-the-way" place to hide a sub where it won't get damaged or be visible to the rest of the outside world. Have no fear of putting it back there, the acoustical cavity of the wagon trunk will help with the low end (which is good since the lock box is shallow enough that you're not going to get much low end resonance from it). Hopefully one of your friends has an "Audio-Toolbox" or some other RTA (real time analyzer) that you can test your spectrum response before you mount the speaker permenantly. During my last venue instalation, we moved the subs around for 2 hours before finalizing their position.
2. Vibrations in doors and sheet metal:
Secure all your fittings, snug down the screws and don't hesitate to dab them with RTV to keep them from working loose. (avoid using heavy grade locktite unless you never want to remove them again) There are alternatives to Dynamat that are cheaper and more cost effective. Check the archives, somebody found a really good house insulation (plastic) that was working well for them. Find a lightweight plastic foam board that is somewhat pliable for the spots where you have to reduce vibrations in the door panels (between the interior panel and the door frame).
-coffee shop is closing down. Gotta run.
God bless,
Fitz Fitzgerald.
--
'87 Blue 240 Wagon, 251k miles.
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