Hi, just wanted to share some of the DIY on killing weird noises from the door panel. Hopefully it helps you on ur sound proofing project later on.

This is the solution to kill of the loose joint nuts on the door panel, where in my case, there's a buzzing sound when i crank up my head unit volume.

I did mine yesterday and it did kill some of the noise cause by these joint nuts.
Step 1: Remove the door panel from chasis and spot the joint nuts
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Step 2: Remove the joint nuts from the holder
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Step 3: Prepare yourself with scissor and the electrical tape.
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Step 4: Cut the tape into small pieces where u gonna tape it on the holder of each joint nuts. Before that, do a half cut on the tape that you have cut out. That is to all the plastic joint nut to fit back to the holder.
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Step 5: Tape it on the holder with the cut facing at the entry of the plastic joint nut.
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Final Step: Push back the joint nuts into the holder and u will notice that it get tighter.

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Do it on 4 doors and when turn up the volume, those buzzing sound are gone. I'm not refering to the rattling sound on chasis, is rattle sound, you have to perform a proper sound proof already.

Thanks and just to share the DIY i've done for my old altis. Hopefully this solution works on your old car as well.
Regards,
Foo

wonderful idea mate. I think the double sided tape that is thicker and has more foam / padding would do better job as well where is contact between plastic or body.

i tried soundproofing my car door with the roofing tar joints. it comes in a roll, sold at all hardware shops. it helped a lot. =]

hey mate, actually i tried on the foam double sided...it too thick till i cant fit in the joint nuts...    

hahah...lets see anyone would have try that...