What vehicle do you drive?

Cad said:

They used test tones and went through frequencies, found the rattles caused by certain frequencies, and then put felt pads/expanding foam in the areas that rattled.

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Been forever since I've poked car audio, but yea, get a test album that plays a single frequency per track and work your way through it killing the rattles as you go. Of course, assuming it's rattles caused by car movement instead of the stereo that you're testing with, that might not be as effective unless you have a stereo that can really move shit around. Could always drop a big external speaker in temporarily if you really wanted to deal with it, although might be worth noting that some rattles might be caused by higher frequencies than a normal sub's crossover.

Control said:

Been forever since I've poked car audio, but yea, get a test album that plays a single frequency per track and work your way through it killing the rattles as you go. Of course, assuming it's rattles caused by car movement instead of the stereo that you're testing with, that might not be as effective unless you have a stereo that can really move shit around. Could always drop a big external speaker in temporarily if you really wanted to deal with it, although might be worth noting that some rattles might be caused by higher frequencies than a normal sub's crossover.

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As far as I can tell, it’s the car moving, not playing music.

Burren said:

As far as I can tell, it’s the car moving, not playing music.

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I mean, it'll still help tighten your car up at the cost of some effort, much of which might be wasted. You won't really know until you can put it in the position that caused the vibration, but trying to fix them in your garage with a speaker in the seat sounds a lot easier than while driving the car. Not perfect, but might do the trick in an afternoon or two of tinkering, which sounds like it might be worth it considering how much it bothers you. If you want to narrow it down first, you can probably get a frequency analyzer app to record/check your specific rattles, not sure if that would save more trouble that it would take though. Although as an effort to effect ratio goes, if you can kill all the rattles that a powerful sub can cause at 20hz, you probably end up with a lot less rattles overall.