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Old 10-12-2005, 11:22 PM   #1
kinada423
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Default Best dampening material to fix trunk spacer rattle.

Installed my 12" fosgate in a sealed enclosure running around 280w rms to the sub. The only rattling I'm experiencing is that cardboard press piece where 6x9's would be installed next to the rear window. Anyone used dynamat or any other method of securing this piece to stop rattling?
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Old 10-13-2005, 12:14 AM   #2
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dynamat extreme is what you need
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Old 10-13-2005, 01:08 PM   #3
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the rear deck would be best dampened with foam or padding of some sort... dynamat wont eliminate rattles and such
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Old 10-13-2005, 03:42 PM   #4
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As ptirmal said, dynamat is not something to be used if you have something that rattles. You need to fix rattles properly. If two pieces are vibrating against one another, either tie the pieces down better or stuff something between them.

Stuff a piece of cloth up there? Old used t-shirt, whatever.
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Old 10-13-2005, 04:59 PM   #5
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another vote for dynamat!
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Old 10-13-2005, 09:00 PM   #6
erictk
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LOL I used a t-shirt cut into small pieces stuffed between the metal and the rear deck cover. It worked on the rattle after dynamat didn't work for me.
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Old 10-13-2005, 09:16 PM   #7
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Frost King foam insulating tape. Available at Home Depot with all of the window insulation materials.

Get the 1/4in thick stuff.

-- Dave
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Old 10-13-2005, 09:22 PM   #8
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Dynamat is used for acoustically treating interior panels of the vehicle and for quieting outside noise. It will not eliminate rattles. Foam padding or the insulating tape mentioned here will work much better.
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Old 10-13-2005, 09:55 PM   #9
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Quote:
Originally Posted by kingtut12
Dynamat is used for acoustically treating interior panels of the vehicle and for quieting outside noise. It will not eliminate rattles. Foam padding or the insulating tape mentioned here will work much better.
To clarify:
Matting materials are used to add weight to door panels bringing their resonance frequency down below audible ranges.

It just happens that you add an extra layer of stuff sound has to go through to reach your ears, resulting in less road noise/etc.

If road noise is your issue, there are far better and cheaper materials that are designed to reduce noise that you can use.

-- Dave
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Old 10-13-2005, 10:06 PM   #10
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I vote for HUSHMATE. It's plyable to -20F and you dont need to heat it up to apply. It sticks to grease, dirt, water, etc w/ no problem. You can apply it by hand! AND it's cheaper than Dynomat by A LOT!!! I have used a lot of other companies..... and now I only deal w/ HUSHMATE. NO HEAT and plyable at any temp. I have installed on H2 Hummers, small sport compacts, Euro like Audi, VW, Benz.... Awesome fix to rattles and increases DB's.
To me, I like the easiest way to install... so I am very excited about this. I have used it for only 4 months now. I am the average Joe-Smoe... I just like stuff that makes my job easier.
I do use the Dynomate roller to apply the HUSHMATE in trunks etc... just to give my fingers a rest.

Absubtle
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Old 10-13-2005, 10:22 PM   #11
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Ok, I have to add my .02... If the problem is that the rear deck material is vibrating and creating the noise itself then a Dynamat material would work (although there are cheaper brands that work just as well). However, if the noise is caused by the rear deck vibrating against the metal frame it sits over than the you need to use foam or a cloth material to put between them.
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Old 10-13-2005, 11:14 PM   #12
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Quote:
Originally Posted by blkwrx02
Ok, I have to add my .02... If the problem is that the rear deck material is vibrating and creating the noise itself then a Dynamat material would work (although there are cheaper brands that work just as well). However, if the noise is caused by the rear deck vibrating against the metal frame it sits over than the you need to use foam or a cloth material to put between them.
No, because then rather than the rear deck material vibrating against the metal underneath, i'll vibrate against the matting...

Best to put foam between it and the deck so that it can't move at all...

Why use a pound or two of matting when you can fix the problem with a small amount of foam that won't even register on a scale?

-- Dave
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Old 10-13-2005, 11:58 PM   #13
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Yeah foam tape is the best idea. But I really think that if you're throwing a stereo in your car then you should get over the idea of weight of material anyways. I think if you're really getting into audio though you won't regret sound deadening your car... even if you aren't into stereo it makes a huge difference in road noise and stuff. Try B-Quiet ultimate... I've heard good things about it, although haven't tried it myself. You can get 100 sq ft for like $200 and it will probably only take like 70 sq ft so at .35 lbs per sq ft that's like 23 lbs. Oooo the weight, it's terrible! www.b-quiet.com

Last edited by filter27e; 10-14-2005 at 12:02 AM. Reason: submit button jumped in front of my curser
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Old 10-13-2005, 11:59 PM   #14
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Great response. I think I'll go with a cheap piece of foam for now. And yes I considered Dynamat but I knew that wouldn't fix my issue and wanted to hear if anyone had a similar problem and weigh their solutions to the issue.

Allready Dynamatted the inside of my door panel's for my 5 1/4 components....75w rms will make a stock door resonate quite a bit
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Old 10-14-2005, 07:01 AM   #15
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Quote:
Originally Posted by AcquaCow
No, because then rather than the rear deck material vibrating against the metal underneath, i'll vibrate against the matting...

Best to put foam between it and the deck so that it can't move at all...

Why use a pound or two of matting when you can fix the problem with a small amount of foam that won't even register on a scale?

-- Dave
Why would it vibrate against the matting? The matting should be adhered to it the same what it adheres to the sheet metal. I've never tried it but I don't see why it wouldn't work.

The only reason it would vibrate against the matting is if it was vibrating against the metal in the first place at which point I said to use foam.
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Old 10-14-2005, 07:13 AM   #16
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Quote:
Originally Posted by blkwrx02
Why would it vibrate against the matting? The matting should be adhered to it the same what it adheres to the sheet metal. I've never tried it but I don't see why it wouldn't work.

The only reason it would vibrate against the matting is if it was vibrating against the metal in the first place at which point I said to use foam.
Well, if it's vibrating now, with a fixed sheet of metal underneath it, it's still going to vibrate if you dampen that piece of metal. The only reason it's making an audible sound is because it's vibrating against something. The vibration is most likely caused by the SPL levels in the trunk, not so much the sound being generated, so even if you put matting on it, it's still going to flap around a bit and make noise.

The only way to shut it up at that point is to either put enough matting in there that it can't move at all, or simply put some insulation under it to keep it from being able to move freely.

-- Dave
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Old 10-14-2005, 08:51 AM   #17
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Quote:
Originally Posted by AcquaCow
Well, if it's vibrating now, with a fixed sheet of metal underneath it, it's still going to vibrate if you dampen that piece of metal. The only reason it's making an audible sound is because it's vibrating against something. The vibration is most likely caused by the SPL levels in the trunk, not so much the sound being generated, so even if you put matting on it, it's still going to flap around a bit and make noise.

The only way to shut it up at that point is to either put enough matting in there that it can't move at all, or simply put some insulation under it to keep it from being able to move freely.

-- Dave
Yes but the whole point of the matting material is to make the vibrating substrate thick enough so the vibration is not audible. Thatís why I gave him 2 different scenarios.
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Old 10-17-2005, 12:30 AM   #18
kinada423
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To squash the oncoming flames and thread heist in dynamat vs blah blah I would like to define that the problem in discussion is the cardboard piece vibrating against the metal and as soon as I get my car back from getting my new clutch put in I will try some foam insulating tape as suggested. I know that the SPL is the cause of the rattling because if I apply pressure on the piece of cardboard so it is held against the metal underneath it the sound ceases.

Dynamat is great for behind the speaker use but my issue and the issue other people might notice will stem from that seperating piece of cardboard vibrating against the metal.

So to encapsulate foam = way to fix the issue.

Thank you all very much for all of your feedback and I'll let you know how it goes
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Old 10-17-2005, 01:17 AM   #19
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Some great advice here already

There are many ways you can treat different issues and some are better than others. I use mat of course, ensolite foam, expanding foam, double face glazing tape, tie wraps, silicone sealer, etc...... It is best to take a good look and think about what each problem area is doing and then devise the best way to treat it. Mat, foam, etc, alone is not enough to take care of every single issue we may have to deal with in a vehicle. They may be the primary items of choice for most things but not the do it all that some tend to think they are, no matter what brand you choose, including ours.

Hint, get a copy of a test tone CD, play individual frequencies(in the lower octaves) at lol, mid and faily high levels and you will hear exacty where the problems are and can deal with time on the spot then test some more until all issues are taken care of. This is what we do on a competition level install, all it takes is time and a little monetary investment to make a world of difference

Rick
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Old 10-17-2005, 10:35 AM   #20
mikeyg
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Default rattle fix

Damping materials are not for rattles per se. Dampening must be lack of gore-tex in the rain. I always laugh when I see "sound dampening" written. Anyhow, the suite of butylene/aluminum damping sheets are for body panels and door skin to help with resonant energy transfer. For rattles try Cascade audio VB5 gasketing foam. Best in my opinion but I'm sure there are substitutes. Good luck.
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