decibel meter

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toyota_4runner

Copper - Posts: 60

Joined: March 31, 2004

Location: United States

Posted: May 16, 2007 at 12:05 PM / IP Logged

Hello.

I am interested in vibration dampening/sound proofing my truck and would like to quantify the data using some decibel meter (noise level before using some product, after, changing exhaust etx). If I do a detailed systematic study, of course it will be shared with the community here. Can someone suggest a decibel/noise level meter which is not too expensive? Also what is the typical db range for road noise you get in a car (so that I know which range to look for, I am not interested in knowing how loud is my stereo is, rather how quiet is my truck.)

THanks

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drvnbysound

Silver - Posts: 289

Joined: May 06, 2002

Location: United States

Posted: May 16, 2007 at 12:22 PM / IP Logged

You can get an inexpensive hand held one for testing ranges from around 135dB and below at Radio Shack for about $50 the last time I checked.

zhalverson

Copper - Posts: 180

Joined: January 21, 2005

Location: United States

Posted: May 17, 2007 at 1:24 AM / IP Logged

vibration dampening? how exactly do you make vibrations wet? it's damping. sorry just being a smart ass. decibel meter -- posted image.

toyota_4runner

Copper - Posts: 60

Joined: March 31, 2004

Location: United States

Posted: May 17, 2007 at 12:09 PM / IP Logged

Haha, sorry for the typo. I guess damping must be a more common usage, but according to the definition in the Oxford dictionary, dampen ALSO means reducing the amplitude of a sound source! But of course it is not the first meaning :)

Big Dog

Gold - Posts: 1,265

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Joined: May 02, 2002

Location: Quebec, Canada

Posted: May 17, 2007 at 12:28 PM / IP Logged

As a reference it's about 70 dB inside a car while highway driving. Of course once you buy your meter you can read your own before and after results. Noise damping is an effective way to increase your i.c.e. by 3 dB's.

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toyota_4runner

Copper - Posts: 60

Joined: March 31, 2004

Location: United States

Posted: May 17, 2007 at 12:50 PM / IP Logged

THanks this info will be really useful. Sorry for my ignorance. What does i.c.e stand for?

Big Dog

Gold - Posts: 1,265

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Location: Quebec, Canada

Posted: May 17, 2007 at 12:54 PM / IP Logged

In Car Entertainment

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the12volt

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Joined: March 07, 2002

Location: Louisiana, United States

Posted: May 17, 2007 at 12:55 PM / IP Logged

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jmelton86

Gold - Posts: 1,228

Joined: February 07, 2007

Location: South Carolina, United States

Posted: May 17, 2007 at 6:32 PM / IP Logged

It does reduce road noise, though, right?

Also, how about that expanding foam stuff? I have 2 cans laying around and thought of doing my trunk area a little. Would this be worth it?

Thanks

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Big Dog

Gold - Posts: 1,265

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Location: Quebec, Canada

Posted: May 18, 2007 at 11:27 AM / IP Logged

The purpose behind sound deadening is to find a way to absorb or transform acoustical energy.

With Dynamat or similar panels, you add mass and hence transform the acoustical energy into mechanical energy having as an end result the absorbtion also of the sound waves.

Poly foam will not add mass but it does serve a purpose just the same as a Helmholtz resonator (don't get me started). The milions of air pockets will attenuate higher frequencies but will not keep panels from vibrating or buzzing.

Prepare your future. It wasn't the lack of stones that killed the stone age.

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