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Box Shape Effect Sub?

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=67036
Printed Date: June 11, 2024 at 7:07 AM


Topic: Box Shape Effect Sub?

Posted By: schnupper
Subject: Box Shape Effect Sub?
Date Posted: November 26, 2005 at 12:48 AM

Does the shape of the box effect a sub? Like if it has a slanted rear or if its a square or a rectangle?

Sounds dumb but i was just wondering



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Headunit-KDC-MP928
Front Speakers-OEM
Rear Speakers-OEM
Subwoofer-Kicker L5 12inch
Subwoofer AMP-Kicker KX600.1



Replies:

Posted By: menace2sobriety
Date Posted: November 26, 2005 at 2:10 AM

no those shapes do not effect the sound at all.   if thats what you mean.



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Posted By: opy1095
Date Posted: November 26, 2005 at 9:18 PM
hes right shape do not matter only the air volume has to be correct for it to sound good and perform the way its supposed 2



Posted By: drvnbysound
Date Posted: November 27, 2005 at 2:07 AM
I took a speaker enclosure design class about 3 years ago and learned...

Technically, yes there are differences, however the human ear will never be able to "hear" a difference. You run into things like free standing waves and interior box resonances.

We calculated all of the boxes using the Golden Ratio...I believe most home theatre speaker enclosures are built on the "Golden Ratio" as well( Definition: Golden Ratio ).

This is an example of how its done:
Vb (Volume of box desired): 1.5 cu. ft.
Vb ^ (1/3) : 1.14471 ft.

Multiply Vb^(1/3) by the following ratio numbers:
0.61803     |     1     |     1.61803

Gives: (dimensions in feet)
.707465     | 1.14471 |     1.85218

Multiply each of these numbers by 12 to get the dimensions in inches:
8.48958"    | 13.7365" |     22.2262"

Assuming everyone reading this knows that the conversion factor to convert from cu. ft. to cu. inches is 1728.
Multiplying each of these numbers together gives the total cubic inches of the enclosure: 2591.96 cu. in.
Dividing this by 1728 results in 1.49998 cu. ft. which was the initial desired volume of the box.

Now that the "Golden Ratio" was used this will ensure no standing waves, etc will be induced by the box dimensions. The problem with doing this is many times it is unsuitable for the trunk of a car because of size constraints.



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Posted By: schnupper
Date Posted: November 27, 2005 at 2:23 PM

SWEET INFO

THANK YOU VERY MUCH!!!!!1

That helps alot



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Headunit-KDC-MP928
Front Speakers-OEM
Rear Speakers-OEM
Subwoofer-Kicker L5 12inch
Subwoofer AMP-Kicker KX600.1


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