Some weeks ago I bought a sheet of Dynamat Extreme (4sq feet) to check out if it really helped about the rattling. I knew 4sq feet was pretty much small, i couldn't even fill half of my trunk lid, but I just wanted to know if it really does a difference. (Im short on my budget haha) I thought it did, because at this time I was using my sealed box, but when I put back my ported box, rattling was horrible. When I say horrible, I mean that I set my sound as little as 5-6 (there is little to no bass inside my car, even if the rear seat is opened) and my trunk lid actually rattle... I know ported box causes air displacement because of the port, which causes more rattling, but at 5-6 volume there is almost no air displacement from the port, it shouldn't be rattling at all since the volume is so low. There are few things that I know for now : -I know my sheet was not correctly installed. I've read that you are supposed to stick dynamat to as much surface as possible, which means inside the trunk lid holes too, so it will strenghen the body and make it less likely to vibrate. (Like I said, I was short on dynamat anyway) -Protege's body is cheap as ****, so it will likely vibrate more. (It's a protege sedan, not a protege5 btw) - When I open my trunk, there are little to no vibration anymore, even at max volume. (pretty logic since there are actually no more pressure inside the trunk) but the rear deck (where the rear speakers are) is just a thick cheap piece of metal, it will vibrate no matter what, even if my trunk is opened, so I definitly need to strenghen that one So that's the info I have, now my question : What is the real meaning of sound deadeners, to strenghen the body, or to reflect the sound? (or the two) If it just reflect the sound, does that mean that I have to put sound deadener everywhere as possible on my trunk? or just the parts that are more likely to vibrate. Since there were no difference with the sheet of dynamat i've put, is there any chance that if I invest on more to cover all my trunk lid (and that damn rear deck panel) it will rattle no more? Will I need to cover the whole trunk? Should I junk my car? (j/k ) I'm pretty short on my budget so covereing the whole trunk is gonna be hard for me. But I don't want to invest on the lid and rear deck for nothing. What are your opinion on sound deadeners, is dynamat the best? I know there are some alternative that are cheaper since I do not have a lot to invest (i'm not talking about seal n peel, I know it's bad and it will smell horrible for months) Btw, I have a Fi SSD 12" and kicker 750.1, it's pretty strong but it's not like I would have a 3000wrms system that would shake the whole car so I know it's possible to stop the rattling And only the trunk is rattling (with some parts of the body like the rear bumper and a piece of metal under my floor, but by rear bumper is just not screwed and I'm gonna remove that useless piece of metal anyway) so I won't really need to do the doors. Thank you, and sorry for that long post, I wanted to give as much info as possible
