Sound Dampening/Dynamat Where to get?

[phatR]

Not that I play my music extremely loud so the neighbours can hear me coming but I seem to get this rattling in my doors when music is playing so I was thinking of just getting some Dynamat or some other brand of sound deading/dampening. Does anyone know where i can get some at a decent price

[sliq]

you can find dynamat at your local Ryda.

i got the door kit for about $100 a few weeks ago.

they may be for sale, pending another sale

[philz]

Most audio stores will have it ~$250 gets you a bulkpack, which contains 9 sheets 18"x32".

Enough to probably do alot of the car.

Ryda is pretty cheap, though being based in WA- Alberts should have it.

[NMX516]

The Dynamat Xtreme door pack is just enough for the inner and outer skins on a 5, and makes a nice difference to the audio. Last time I bought a pack it was ~$120. Most decent car audio suppliers will have it.

[bensale]

Sorry to hijack...

Anyone have any clever (free) solutions to this problem. I tried using some cardboard but it didn't really work (made a small difference) I'm going to try some foam like stuff but if anyone has an idea I'm all ears.

[wun911]

I like cardboard at least your trying the lightweight options first.

WTF is dynomat made out of?? What is it that makes it so dam heavy?

[sliq]

Sorry to hijack...

Anyone have any clever (free) solutions to this problem. I tried using some cardboard but it didn't really work (made a small difference) I'm going to try some foam like stuff but if anyone has an idea I'm all ears.

umm.. my brother tried doing the cardboard trick in his civic, make the sound even worse i think okibi had some quick fix, using some bed mattress material.

[philz]

I like cardboard at least your trying the lightweight options first.

WTF is dynomat made out of?? What is it that makes it so dam heavy?

WhyTF is cardboard even use in the first place...

Firstly let's take a step back and think about what we are trying to achieve here.

Sound dampening/deadening main aim is to ADD weight to the thin sheet of metal on the car door. To cut out resonance.

Making it LIGHT does not achieve this.

Imagine you live in flat and your wall are made out of cardboard vs 30cm thick concrete, obviously the cardboard walls would mean that you would hear your neighbour's domestic violence. But if you had thick walls, they could shoot a whole porn scene at 2am in the morning and you would be sound asleep.

So now back to the car doors and speakers.

So your car speakers are okay, you need to turn them up quite loud, and there isn't enough thumping bass.
The reason? Is due to the thin sheet metal. This thin metal makes you hear all of that nasty road noise and being quite flexible, when you are pumping the bass it resonates the car door loosing all of that precious bass that should be thumping right at your chest.

so the solution to stop the flexing of the car door, is to ADD weight to the car door to stop the resonating. Which in turn will IMPROVE your car speaker performance and cut out road noise.


And no don't use Foam as a Diffuser behind the speaker... no it won't work.

[Regie]

has anyone got any pics of there they have installed the dynamat on the skin of the doors?

i want to do this to mine soon and get rid of those vibrations from the speakers

[philz]

Not of an mx5 but the principle is the same with all cars.

Courtesy of FHRX studios:


The inner AND outer is door is covered.

The inner (the one which holds the speaker) is to stop vibrations, the outer skin is covered to solidify the "speaker enclosure".

Also you want to maximize bass. Cover the extra holes in the door with 3-6mm mdf, then cover with dynamat. I believe there is one above the speaker and on the side, to fully "enclose" it.

If you spend $300+ on speakers and don't do the following, you will not be using the speakers to your full advantage. Your mid range and highs will be there, but the bass will be lacking.
Installation is the key, not the actual products you use.

Also if you believe dynamat is "too heavy" then there is a method... by cutting it up into smaller squares .. say 2"x2", and placing it in a "checkerboard pattern", iirc it achieves nearly the same results.

[Jeo]

Bah, see what happens when you take too long to write a giant post, someone beats you to it.
Anyway, what I originally wrote...


Sure do Taken from my build thread

The tools + product


Door skin off, dust guard off, degrease everything, remove all that black sticky stuff


Nice clean door


the finished product

The product on the right is another brand of sound deadening I had left over from another car. You certainly can survive with whats in the Dynamat door kit, I just used the old stuff for some of the fiddly bits as it becomes much more maneuverable with much less heat.

Basic idea...
1. Take door skin, door handle and splash guard off.
2. Degrease the hell out of it to remove all the black sticky stuff.
3. Start with one edge of a sheet. I always found its easier to start from the top edge and work down but I have had others who swear its easier from a side edge working across, what ever works for you.
4. Use a heat gun/hairdryer to heat up the product and slowly work your way down/across/whatever. This essentially melts it a little so that you can get it into tighter spaces better (over wires, following dips in the door, etc).
5. Step 4 again with the next sheet.

Once you get to the handle/locking mechanism...
Obviously the handle end has to be on top of the sound deadening, while the other end has to be inside the door and therefore inside the sound deadening. This means at some point you're going to have to get it to cross over. Best way I've found is to lay the sheet closest to the front of the door an work your way back. Then once you get to the cross over point, you want as small a gap as possible but without getting the rods stuck. Cut a small piece off another sheet and stick it back to back against the new sheets you're about to use next. Make sure the small piece covers the bit that would otherwise stick to the rods.

Really not that difficult of a job. First time I did it a friend and I knocked over two cars in a couple of hours. First door will take much longer than the second, as you do get better at it. I did my NA on my own in less than an hour.