decibel meter
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=93969
Printed Date: May 01, 2024 at 5:49 PM
Topic: decibel meter
Posted By: toyota_4runner
Subject: decibel meter
Date Posted: May 16, 2007 at 12:05 PM
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
Replies:
Posted By: drvnbysound
Date Posted: May 16, 2007 at 12:22 PM
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.
Posted By: zhalverson
Date Posted: May 17, 2007 at 1:24 AM
vibration dampening? how exactly do you make vibrations wet? it's damping. sorry just being a smart ass. 
Posted By: toyota_4runner
Date Posted: May 17, 2007 at 12:09 PM
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 :)
Posted By: Big Dog
Date Posted: May 17, 2007 at 12:28 PM
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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Posted By: toyota_4runner
Date Posted: May 17, 2007 at 12:50 PM
THanks this info will be really useful. Sorry for my ignorance. What does i.c.e stand for?
Posted By: Big Dog
Date Posted: May 17, 2007 at 12:54 PM
In Car Entertainment
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Posted By: the12volt
Date Posted: May 17, 2007 at 12:55 PM
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Posted By: jmelton86
Date Posted: May 17, 2007 at 6:32 PM
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 ------------- 2013 Kia Rio -90a alternator
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Posted By: Big Dog
Date Posted: May 18, 2007 at 11:27 AM
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.
Posted By: zhalverson
Date Posted: May 18, 2007 at 2:20 PM
Sounds like an interesting expirement to me. I noticed a big difference by doing the floor and as much as the firewall as I could do alone. Another thing to try might be adding a closed cell foam like ensolite to your doors after you deaden them, seemed to help in my cherokee. Good luck and have fun...
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