m3gach33zy

I finally got my sub working a while ago so now I need some sound deadening installed . I was looking at the trunk but I'm a little confused how I should install it over the rear speakers and trunk spring? Should I just cut holes out for the speakers? Or do you not need to put any there?

I've read through several threads:
https://www.civicforums.com/forums/2...ening-diy.html

But I don't understand where you are supposed to fill the cracks with silicone? Additionally, my sub seems to leak a LOT of air around the edges where it screws in should I silicone that up too?

GolNat

iTrader: (7)

I have never used dynamat, but what I have seen you are suppose to cut a hole around the speaker. The same for trunk spring. As small a hole as possible for the spring. I would think that you fill the cracks between the squares of dynamat so that's it air tight. Your sub box should definatly not have leaks if its a sealed inclosure. I would get a gasket and re-seal the sub in the box. They make an adhesive type that you can stick around the outside of the hole. Silicone would work but wouldn't re-seal as well if you need to remove the sub from the box.

m3gach33zy

That first picture is blowing my mind. Are those just little squares of dynamat or is that a whole sheet under there? If so how the hell...?

In the second picture it looks like they are covering over the whole spot while just molding it in?

Also, the spot under the rear deck speakers seems pretty difficult to just tack up in one whole piece of dynamat, so it's okay to cut little shapes to fit where I need, or will that just decrease the effectiveness?

GolNat

iTrader: (7)

Lol, I don't know but the first picture looks really cool. I don't know how they did that, buts that how I want to do mine. They probably used the squares and stuffed them up there. Yea you can cut small shapes to fit, you just to make them as tight as possible. Dynamat makes a tape that you use to cover all the small cracks between the squares. The second pic looks like they taped the whole thing up to make it air tight and give it a finished look. It would probably be best if you could keep the pieces as big as possible.

lowlife9

you can actually use grace water and ice shield from home depot its the same stuff but half the cost of dynomat.
https://www.civicforums.com/forums/2...ping-mats.html

m3gach33zy

Thanks for the tape idea that'll probably come in handy!

gearbox

iTrader: (95)

just remember dynamat is a mass loading material and not a sound barrier (altho it does block a tiny bit of noise). its main purpose is to reduce panel resonance and it doesnt matter that you apply it everywhere. a few patches here and there will have the same effect. if you want noise reduction, then you put a sound absorbing mat over it like 3m thinsulate or cell foam.

http://sounddeadenershowdown.com/cgi-bin/index.cgi

m3gach33zy

My brother in law bought the industrial pack from amazon and ended up not needing it so he gave me a good deal

m3gach33zy

I'm not too worried about road noise. I'm more worried about trying to get the quality of the sound to go up. I can tell the sub's working, but it sounds like its no where near where it should be. You can hear my trunk lid resonate so I figured dynamat would be the best solution. From what I've read and what some people have told me is that fully installing dynamat in the trunk increased the sub quality quite a bit.

lowlife9

ok but you can also use JUTE material from home depot for absorbing sound like gearbox mentioned its in the carpet section.

m3gach33zy

Is that something I could get at cartoys or is that something I have to buy online?

m3gach33zy

I remember reading a huge thread a few weeks ago about JUTE. Might sound stupid... but does JUTE just replace your interior carpet or is that supposed to be another lining under it?

lowlife9

you put it under the carpet behind the headliner and panels basically anywhere you can.

gearbox

iTrader: (95)

well the oem carpet has a fleece type mat under it already, so it may be too thick. i redid my carpet in sections and used foam with a layer of auto store carpet glued in. much less weight and looks more or less oem. and when the driver side gets dirty, i just tear it out and glue a new piece in. but yeah at one time i had the whole trunk dynamatted and even my single 10 inch sub pounded nicely. nobody could believe it was a single 10.

GolNat

iTrader: (7)

I don't know what cartoys is? They might have it at homedepot, best buy. Here is what im talking about.

http://www.stockwell.com/pages/products_gasket_tape.php

m3gach33zy

Awesome. Would you/anyone know where you are supposed to seal the trunk with silicone? In the original link mohawk was saying he had to seal some parts, but I don't understand where he's talking about.

Cartoys is a car audio place. Thanks for the link I was wondering how I could get a gasket in there lol!

I think I'll try the JUTE stuff under the carpet and headliner after I get the trunk done .

Also, my header is pretty damn loud, and I've heard it's a good idea to tack on a sheet of dynamat under the hood to help reduce noise? Wouldn't that just melt off from the engine heat though?