I have been thinking of eliminating some rattles from my doors I noticed on my 2008 G35 sedan. DO you have a link to the open cell foam you are recommending? Any help is appreciated especially any DIYs on door panels, I have just started my searching on Driver, but looks like you have a lot of references so far DonPisto..... much thanks!!

 

The website is currently not working, but it's www.secondskinaudio.com. The open cell foam is called Rattle Pad. I think it's $20 or $30 for 9 sq. ft. From what I remember that should be enough for both doors and still have some leftover, but this was with my '01 Accord sedan.

As for recommendations, not sure if I already mentioned this but I would put at minimum two layers of deadener on the inside part of the door panel followed by a layer of closed cell foam, which is called Over Kill. If you would like, you can put something called the speaker tweaker kit directly behind the speaker (on top of the deadener and cut out the overkill in the area or just dont put any there) and it is supposed to improve bass.

Moving to the outer portion of the door I would do at minimum 1 layer of deadener and over that a layer of Rattle Pad, which will go between the outer layer and the door panel. What I did was get some velcro strips and attached it to the deadener on the outer door and the rattle pad so it stays in place.

Other than that, what you can do is get a test tone and play it (not too loud because you don't want to destroy your equipment) and see what frequencies cause the rattling or vibrating. Here is a link for the test tones: http://realmofexcursion.com/downloads.htm

Get the sine sweeps and use those. If no rattling or vibrating occurs, move to the next. Once you find some rattling with one of the sweeps you can put it on repeat and try to locate where the rattling is occuring and targeting that area.

I would recommend doing up to 600 Hz as that is midrange frequencies. Around 800 or so is more towards tweeters, though not quite, but horns will play around there. Your midbass will be generally from 60 Hz to 300 Hz, so that will be the primary area. Careful with the lower frequencies (35 Hz and down since those can damage the sub if a) you have a ported box and it's tuning frequency is above the test tone being played or b) playing it too loud since it can cause the back plate to tap which can in turn damage the coil on the sub. I usually played test tones a few notches below what I normally would for a CD quality song that I would play at it's loudest level. Certainly you don't have to go loud as I found some songs to rattle even at moderate and minimal levels.

I'll try and see if I can catch onto any songs that I notice would probably cause rattling. Two at the top of my head are: Common - Be and John Legend - Save Room (not quite as much but I notice it in my car).

On a side note, a really neat song on the site I provided is "Bass I Love You" by Basstronics. Careful though, it's got a 14 Hz note (I think, maybe a little higher) that can easily damage a sub with a ported enclosure if the amp's SSF is not on or if it's being played at a volume where it can damage the sub. That 14 Hz note is extremely low, and can't be heard, but it can be felt (depending on your subs capabilities).

If you have any other question or need clarification I'd be glad to explain more, and try to refrain from writing a novel, lol.