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Old 07-05-2019, 05:22 PM   #1
Hyper
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Default Sound deadening over stock deadening?

I am in the process of changing the carpet in my forester

is it worth putting sound deadening material over the stock sound deadening? I have plenty of sheets left, so I figured while I have the carpet out I could deaden the floor..... removing stock deadening is a pita that's why I thought I'd just put aftermarket layers on them
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Last edited by Hyper; 07-05-2019 at 05:38 PM.
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Old 07-06-2019, 04:22 PM   #2
corlon
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i would do as much as i can without it looking fun with the carpet in there. i've done 3 layers of material in some vehicles.
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Old 07-13-2019, 01:21 AM   #3
indy23
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If you can spend up to 800$ and try and do the whole interior roof, doors...etc..it really makes a big difference if you use the dynamat ultra.
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Old 07-13-2019, 07:13 AM   #4
bdubblu
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Dynamat isnít ďreallyĒ a sound deadener as most sound deadening nerds would argue, however it does do a couple of things. It eliminates rattles and vibratory noise. Thatís huge in econocars where there is very little sound deadening material already. Dynamat as much of the floor as you can get to easily. I installed in my doors and covered over the open holes. It does block some road noise there, albeit a little.
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Old 07-13-2019, 02:28 PM   #5
gunz4me
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Quote:
Originally Posted by bdubblu View Post
Dynamat isnít ďreallyĒ a sound deadener as most sound deadening nerds would argue, however it does do a couple of things. It eliminates rattles and vibratory noise. Thatís huge in econocars where there is very little sound deadening material already. Dynamat as much of the floor as you can get to easily. I installed in my doors and covered over the open holes. It does block some road noise there, albeit a little.
So true! All traditional sound deadening does is cause the panel to resonate at a different frequency, hence the reason why the marketing of most sound deadening utilizes the knock test on the panel before and after application.

To truly block noise, things start getting really heavy. It generally involves strategic placement of sound deadening material to alter the underlying panels resonating frequency, utilizing a decoupling layer of closed cell foam on top of the deadener, then adding 1 pound per square foot mass loaded vinyl on top of the closed cell foam. Good luck installing your carpet over that monstrosity that just added 1 to 1.5" of thickness to your floor.
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Old 07-13-2019, 04:58 PM   #6
Hyper
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Originally Posted by gunz4me View Post
knock test on the panel before and after application

what's that?
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Old 07-13-2019, 06:05 PM   #7
gunz4me
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Quote:
Originally Posted by Hyper View Post
what's that?
Knock on the panel before and say "hear this pinging?"

Apply deadener, knock on the panel again and say "look, much more quiet!"

All they did was change the resonant frequency of the panel. So unless you drive over gravel roads or through places where crowds of people knock on your car, you really aren't blocking much noise out.

Now, does sound deadener make a difference in a factory car with little to no sound deadening? Absolutely.

Does it block out road noise as advertised? Not by a long shot! Also, with the proper product, you don't need 100% coverage of all the sheet metal. Like everything else in life, there is a law of diminishing returns when applying deadener.
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Old 07-17-2019, 08:05 PM   #8
wts3
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Dynamat worked wonders for NOISE in my STI - road and otherwise. HUGE difference. I did roof, floors, sides, and trunk. Well worth it.
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Old 07-19-2019, 08:36 AM   #9
Raver208
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Subaru Banner Sound deadening necessary?

Good morning! I'm in the process of shopping for upgraded speakers for my 2013 Impreza Limited.
Pioneer TS-A652F - Front door speakers
Pioneer TS-A1370F - Rear door speakers
Kenwood Excelon KFC-X2C - Front dash speakers

Will sound deadening in any of the install areas be necessary or especially helpful? I am not swapping out the headunit or adding a sub-woofer or anything like that. THANKS!
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Old 07-19-2019, 11:04 AM   #10
bdubblu
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Quote:
Originally Posted by Raver208 View Post
Good morning! I'm in the process of shopping for upgraded speakers for my 2013 Impreza Limited.

Pioneer TS-A652F - Front door speakers

Pioneer TS-A1370F - Rear door speakers

Kenwood Excelon KFC-X2C - Front dash speakers



Will sound deadening in any of the install areas be necessary or especially helpful? I am not swapping out the headunit or adding a sub-woofer or anything like that. THANKS!


Yes. The doors have no deadening at all. I used dynamat on the doors. I put a couple strips against the outer body panel to absorb and vibration there. As well as I covered the inner panel as much as possible including covering the open holes. It was absolutely noticeable that less road noise came through the door. The doors also close with a low thump like my Benz does.

In most cases people would suggest that dynamat is not a true sound deadener. But it does grab vibrations well, and when you cover open holes, it seems to take some level of noise away.

Might as well do everything you can to improve the characteristics right? Especially when itís an affordable thing like dynamat.
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Old 07-25-2019, 06:05 PM   #11
Ernest
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Get ensolite and dynamat. It works.
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