sound wave theory
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=114553
Printed Date: May 08, 2025 at 9:05 PM
Topic: sound wave theory
Posted By: lotaimpalass
Subject: sound wave theory
Date Posted: June 18, 2009 at 8:49 PM
I am looking for some one who can help explain Snells Law to me I am ok at sound wave theory, but for some reason am having a little problem with this.
Replies:
Posted By: aznboi3644
Date Posted: June 18, 2009 at 10:01 PM
snell's law doesn't really have to do with acoustics...its the refraction of light like looking into a glass of water with a straw in it...from the side the straw is not a continuous piece.
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Posted By: lotaimpalass
Date Posted: June 19, 2009 at 7:13 AM
The formula works the same for sound waves from what I have been reading. When a wave hits an object at a certain angle other than 90 degrees that angle changes when it enters that object. And it changes depending on the acoustic impedance mismatch, frequency and the velocity between the medium of the original material and new material. If I am way off please let me know. It sounds like what you said, but wtih light waves. The light hits a object that bends it's light to make the light wave change in the "glass with a straw".
Posted By: aznboi3644
Date Posted: June 21, 2009 at 6:12 PM
are you trying to calculation the direction of energy after say a sound wave hits a wall???
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Posted By: DYohn
Date Posted: June 21, 2009 at 6:38 PM
Here: https://www.ndt-ed.org/EducationResources/CommunityCollege/Ultrasonics/Physics/refractionsnells.htm I've heard of this principle being used by scientists developing materials used to sound-proof a room. ------------- Support the12volt.com
Posted By: lotaimpalass
Date Posted: June 21, 2009 at 10:55 PM
Actualy I am a Level 3 NDT inspector at Spirit Areospace fomaly Boeing Aircraft in Wichita. I have taken and passed My level 3 Magnetic Particle test and Penetrant test. I am working on my Ultrasonic level 3 test and this is one the sites I use to study. With that being said I was looking over most of the info again on the afternoon of the 19th and it all started to click again I haven't studied it for over 10 years. Alot of the info on that site can directly be applied to this feild. I love both of them so it seems to work out well for me if I can remember it all. How did you come up with this site?
Posted By: DYohn
Date Posted: June 22, 2009 at 3:40 PM
I used to work at THX and we were doing a lot of research into sound propagation and the materials science used to treat acoustic spaces at the time. I recalled the site from those days. :) ------------- Support the12volt.com
Posted By: ianarian
Date Posted: June 22, 2009 at 10:02 PM
Do I smoke crack?(metaphorically) In a square 1-ft3 box, take a masonry brick, dice it into 1/4's, glue each 1/4 into each bottom corner of the box. Purpose: to provide a dense barrier to reflect/absorb sound waves roaming inside the box.
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Posted By: lotaimpalass
Date Posted: June 22, 2009 at 10:35 PM
I think so. Because of the density and elasticity of the brick it will not absorb much like ~3%. Now reflecting it will do that do to its properties. The two terms are fairly opposite. I don't see how those bricks are helping you, but if they make you think it does, then it does. Later Matt
Posted By: lotaimpalass
Date Posted: June 22, 2009 at 10:39 PM
DYohn] wrote:
used to work at THX and we were doing a lot of research into sound propagation and the materials science used to treat acoustic spaces at the time. I recalled the site from those days. :)
That is awsome I would think that THX would be a neat place to work.
Posted By: ianarian
Date Posted: June 23, 2009 at 10:01 AM
I've always wondered about the theory, I've only tried it once and must not of been impressed enough to remember to do it again. Its suppose to be for perfectly square boxes to imbalance the sound waves from all reflecting the same way off the sub.
thanx
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