Ideas to stop panel rattling on 14 year old car?

[SketchyRollin564]

so i have a 95 240sx and since ive had it i had the stock blown rear speakers and the font speakers didnt even work for some reason

anyways i finally got the car running again, got a pioneer head unit, some alpine type S for the rear, and some swap shop 4way speakers that actually arent too bad for the front

now whenever i have any bass it rattles like crazy. Not so much distortion from the speakers having too much bass, but just rattling from the interior panels being so loose or whatever it is (even tho just 6.5inch speakers dont even make that much vibration in the car)

anyways, i wanna fix this so i can listen to my music with a decent level of bass so im not hearing just the highs unless i wanna listen to rattling all day.this rattling drives me insane!

i also wanna get rid of road noise when im driving, so it doesnt drown out the lower frequencies, so i put the carpet back in the trunk, hopefully that will do a little tiny bit, and i also want to dynamat the doors, i have to look into that. I know baffles do somthing like that too, but i havnt really done much research on them

what im wondering though, is how can i stop the rattling from the door panels and that rear deck? im thynking about buying a big sheet of foam, and just sticking it to the underside of the rear deck panel and hopefully that will help with some plastic on metal contact that ive been having

as for the doors, im gonna lay foam between the "arm-rest" and that thing you hold to close the door, or stick your phone in or whatever since the part where you put the screw in is obv broken and that rattles around,

the other part of the door that rattles, i havnt found where it is, but when i push down on the door panel with my hands, the rattling stops (on that door)

any experts in this or people who fixed the same problem wanna give some pointers?

im thinking about just laying foam around and in-between every part that makes contact with another that isnt tight, but i know theres gotta be a better way to do this

[EW]

I cover the backs of the plastic panels with Dynamat Xtreme. You could also replace all the old plastic panel pops with new ones. Dynaliner foam works well to decouple the plastic panel from the metal panels as well.

[Looneybomber]

You've got options

As EW points out, you can decouple. (Foam between materials)

You can also absorb energy (Soft visoelastic materials that absorb energy)

You can also increase weight to lower the resonant frequency (that's mostly how sound deadeners work, although they do have some absorbsion properties)

What also works, but is hardest, is reinforcement. This reduces the amount of vibration. SPL vehicles will do a lot of this.

[SketchyRollin564]

well heres what i did for the back

since its metal to metal with the speakers and the rear deck, i stuck some foamy s*** in between the speaker and the deck where it mounts which helped alot, and reduced vibration rattling the rear deck and the sound traveling into the cabin instead, and it actually hit pretty decent for speakers mounted metal on metal

when i put the rear deck cover carpet thing back over it though, it absorbed pretty much all the bass lol

you still hear it thumb, it just doesnt boom, if that makes any sense

i also taped some foam around the underside of the rear deck cover to block out road noise from my echo-ey trunk.

im gonna try taking out foam on the rear deck thats close to the speaker holes/grille thing, and see if that does anything, i just hope i dont hear more rattling

as for the front... i have no idea what to do lol. I can try the foam thing, so the vibration doesnt go directly to the doors, but i have a feeling its still gonna rattle them if theres enough bass

[Looneybomber]

Ohh, I didn't know you meant between your speaker and your mounting surface.

You could try something like making a ring out of plywood to mount the speaker to and mount the plywood to the door/rear deck. That will help with the speaker vibrating, but it won't do anything to stop the vibrational energy from being transfered into the door/rear deck.

For that you'll either need to reinforce (reduce vibrations and raise resonant freq.) and/or add weight (reduce resonant frequency, absorb some vibrational energy).