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View Full Version : Sound deadening <parabol>



s_tim_ulate
26-02-2005, 03:51 PM
we (my friend and i) put a bit of sound proofing in, but didnt really worry about it originally (due to lack of funds) anyhow now, i think that it may be causing excess damage to the car and speakers due to lack of sound deadening.. any guides you have or brands which you can reconmend?

Cheers

parabol

Comes down to how much you want to spend, a little bit will see a great benefit usually.

I have stinger roadkill expert atm, definetly recommend it. Also G-Spot and Serenity max are all in the same ballpark.

Flashtac is too thin and requires two layers usually, but if you don't want to spend heaps this is also an option.
As to application, I have done both sides of my doors, but many opt just for the inner layer. It is also wise to seal up the service holes as much as possible using mdf and gaffa tape etc then sound deadening over this. This provides a better cavity for your speakers, and whilst it is almost impossible to seal up a door completely, if you can seal up 95% it does wonders, and also stops reflections/cancellation within your doors.
On that note, for a few $ you can stick acoustic tiles behind your midbass drivers, to stop waves reflecting off the back of the door onto the speaker itself. These are just foam tiles (that you see in recording studios)

Deadening itself aims to reduce the resonant frequency of the panel. Once you have gotten rid of this there are still many other rattles in the door itself. Use electrical tape around lock rods to add weight to these and jam foam/rags in b/w whatever you can find that is rattling. (I did this in between the stock speaker covers in my tf.)

Finally after all this is done you will notice the door trim itself resonates, as this has many curves in it, traditional deadener is hard to apply. So try a paint based deadener to get into all the cracks.

Deadener is available from most good car audio shops. Also autobarn and Jaycar (although not heavy duty) and you should aim to spend around $100 - $150 on two front doors.
3rd gens arent too bad for boot rattles as they already have compounds separating the bootlid from the frame. Deadener may be necessary for subs running more than ~300w rms.

Deadener is different to sound proofing, sound proofing, eg the stuff under your carpet and on your firewall, attempts to stops sound waves passing through it. While deadener adds weight to panels. (Nevertheless after deadening, your car will be much quieter.) But adding soundproofing will reduce road noise, which is also beneficial for good sound quality.

If you need advice on applying it and sealing up your doors etc let me know.
here's some pics of my tf doors.

Peace

Tim

eek
26-02-2005, 04:26 PM
Shoulda heard my boot when I turned up the sub. Sounded like it was going to pop open lol I'm too scungy for sound deadening

Steve_N
04-03-2005, 06:51 PM
Stupid question - will sound deadener add extra weight to the car, and if so how much??

Cheers.

Big Paul
04-03-2005, 07:11 PM
Stupid question - will sound deadener add extra weight to the car, and if so how much??

Cheers.

Yes, it will, and it depends on how thick u go :D

megatron
01-06-2005, 09:22 AM
hi tim have u got any more pics of the install
if so can u emil them to me sales@mrcdr.com.au

high res pls

i am starting mine 2nite

also how much roadkill expert did u use just the door kit or more??

also the liquid stuff cost S@#T loads how much of that did u use is 1 can enough??

s_tim_ulate
01-06-2005, 09:55 AM
I got more pics at home I think but might not be able to get them to you till tomoz... Will see how i go.

Liquid stuff is exxy. 55-65 a litre but this is enough to thoroughly do two trims.... They set like a rock... (I left some on my paint brush and it was solid...)

And still had a fair bit left over, which may go onto the parcel shelf.

Make sure you cover all the plastic and in behind the airvents etc, any spot you leave untouched u will hear creaking on the trim

I used a whole two door kit and also a little bit more to cover the mdf panels. If you put mdf panels in like i did, u may need a bit more, but you can afford to skimp a bit on the inside of the outer panel, u can scatter it out (in a chequered style) a bit just make sure u deaden behind the driver fully, and try and target the bigger panels. (dont need to worry as much near joins etc as these are braced which stops resonance

best liquid stuff is the specialist car audio stuff... Stinger etc.

I used Sound off... Worked a treat, very heavy.

Peace

Tim

megatron
01-06-2005, 10:12 AM
where did u get that liquid stuff so cheap

i looked and it cost $100 for 1.1L of stinger liquid roadkill



i got 2 door kits so it should do the doors an dhave some left over for the boot

yes i have MDF like yours for my spks

magnat
01-06-2005, 10:15 AM
I use Sound off, paint on Sound deadoner.. About $45 a jar..
Enough to do one boot lid or Two doors..
Ugly as sin to look at so definately requires carpetting if doing the boot lid but Really effective where others cannot reach..

s_tim_ulate
01-06-2005, 10:20 AM
In VIC u can get it from central car radio on nepean hwy... Not sure of retailers in QLD...

Cool with the mdf make sure its mounted flush if ur going against the plastic Will require u too flatten the plastic stuff. (deaden the plastic too with the liquid stuff... or with stinger from behind)

Colgate
01-06-2005, 04:29 PM
i done my doors with Dynamat ... think it was $78 for the 2 doors ... still have to do the boot yet