cubic feet 8 jl w3 sub fiber glass enlc
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=123908
Printed Date: April 28, 2024 at 9:23 PM
Topic: cubic feet 8 jl w3 sub fiber glass enlc
Posted By: antwone230
Subject: cubic feet 8 jl w3 sub fiber glass enlc
Date Posted: October 13, 2010 at 1:30 AM
I am making a custom fiber glass enclosure for my 8 inch JL audio W3 and I am not sure on how much air space this sub needs to be on the inside? I am putting the enclosure in the back right rear of the trunk.
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BOOM, All day every day
Replies:
Posted By: antwone230
Date Posted: October 13, 2010 at 10:03 AM
Alright in a sealed enclosure the volume would be 0.3. Do I have to add the Driver Displacement: which is 0.03 . Do I combine both numbers for my total enclosure internal area?
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BOOM, All day every day
Posted By: mrm1776
Date Posted: October 13, 2010 at 12:53 PM
It should be the volume AFTER you've removed the displacement of the woofer. So 0.33 is what you should aim for. This is just going off of the numbers you gave me. ------------- MECP Basic Installation Tech
Certification ID: CEA195600
Pioneer AVIC-X920BT
Polk Audio DXi 6500 - front
Rockford Fosgate Power T1693 - rear
Alpine MRP-F300
Alpine MRP-M500
Alpine SWR-1242D
Posted By: icearrow6
Date Posted: October 13, 2010 at 5:19 PM
Also don't forget to take into account the displacement of the woofer itself.
So:
.3 (your goal) = Total Volume - Bracing - woofer volume.
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Posted By: antwone230
Date Posted: October 14, 2010 at 1:30 AM
so you mean if the box is 3 cubic feet and then when i put the sub in that subtracts from the 3 cubic feet so i have to compensate for the lost volume?
I am really confused on this box volume and how big i need for it to be.
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BOOM, All day every day
Posted By: Alpine Guy
Date Posted: October 14, 2010 at 8:00 AM
You need a .33 cu.ft box to compensate for the driver displacement.
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2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: mrm1776
Date Posted: October 14, 2010 at 10:23 AM
Alpine Guy wrote:
You need a .33 cu.ft box to compensate for the driver displacement.
Or slightly bigger depending on how much bracing you do. 0.33 is a pretty small box though so you shouldn't have to do a ton of internal bracing. ------------- MECP Basic Installation Tech
Certification ID: CEA195600
Pioneer AVIC-X920BT
Polk Audio DXi 6500 - front
Rockford Fosgate Power T1693 - rear
Alpine MRP-F300
Alpine MRP-M500
Alpine SWR-1242D
Posted By: icearrow6
Date Posted: October 14, 2010 at 12:19 PM
Yes:
(woofer displacement) + (internal bracing) + (target net volume) = TOTAL VOLUME your box needs to have.
Example:
.3 Qft (woofer) + .5Qft (bracing) + 3 Qft (desired airspace) = 3.8Qtf (total air space needed)
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Posted By: antwone230
Date Posted: October 14, 2010 at 3:24 PM
to make .30 ft............... 12in x 10in x 8in (Width x height x Depth)
305mm x 254 x 203mm
Is this correct guys?
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BOOM, All day every day
Posted By: Alpine Guy
Date Posted: October 14, 2010 at 4:41 PM
antwone230 wrote:
to make .30 ft............... 12in x 10in x 8in (Width x height x Depth)
305mm x 254 x 203mm
Is this correct guys?
That would be .33 if those measurements are outside measurements, and the enclosure wall thickness is 3/4" ------------- 2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: i am an idiot
Date Posted: October 14, 2010 at 7:29 PM
How much bracing should he use?
Posted By: antwone230
Date Posted: October 14, 2010 at 8:53 PM
i am making a fiberglass box for this for a chevy aveo, should i make it slighty bigger, I know these speakers boom for their size.
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BOOM, All day every day
Posted By: antwone230
Date Posted: October 15, 2010 at 1:50 PM
I want to make fiber glass enclosure in rear trunk for 8 inch sub would it be any better if i mounted the sub up in my rear dash for bass.. Or will this be loud enough in the rear trunk?
I have a chevy aveo, small car.
Thanks for all the help guys!
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BOOM, All day every day
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