subwoofer box question.

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=50170
Printed Date: July 19, 2025 at 7:27 PM

Topic: subwoofer box question.

Posted By: Bert2011
Subject: subwoofer box question.
Date Posted: February 15, 2005 at 3:24 PM

I just got my new setup.. im really happy about it ....
i got two 12in Infinity Kappa 120.3SE subs SUB Link

and Infinity Reference REF610A amp AMP LINK

i want to make my own sealed box.....

i did some research ... dosnt look so hard :)

on the inf site it shows that the one sub works in 1.00Ft3
posted_image

i did some calculations
and a box for one subs comes out to
Depth = 7.2 inches
Height = 19.44 inches
Width = 12 inches
and the sub cut out .. the hole .. should be 10.94"??
posted_image

I want to make a box for 2 subs ....
what should i do??

just 2x the Width ??
or make 2 single boxes and just screw then together side buy side??

I know i can just go out and buy a box .. but ppl tell me making your own will make the subs sound better :)

thank you
-bert

Replies:

Posted By: KarTuneMan
Date Posted: February 15, 2005 at 6:13 PM

Look at www.proboxrocks.com these guys have THE BEST pre-fab boxes I have ever used.

The are sealed with linex bedliner stuff......air tight, and tuff as nails

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Posted By: doctorspies23
Date Posted: February 15, 2005 at 6:18 PM

you can construct the enclosure with 2x dimensions but add a divider between each driver cell and count it in with your calculations.

hope this helps

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SPIES

Posted By: stevdart
Date Posted: February 15, 2005 at 8:03 PM

One box or two? You be the judge according to the room you have to work with. If you made two complete enclosures there would be no reason to screw them together. As the doctor said, one enclosure with a separator baffle. Yes, each sub needs its air space. The mfg was kind enough to give you volume that includes the displacement of the driver, so you figure each chamber to 1 ft^3 and you're good. That cutout hole looks like 11" to me.

You must be making this box for behind the seat of a truck, as thin as it is. See if you can push the depth back 2 inches and make up the difference elsewhere. That's too close to the backside of the woofer.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Posted By: Bert2011
Date Posted: February 15, 2005 at 10:05 PM

well i own a suv.. i really dont care about the size of the box.... :) i dont want it small and thin

Posted By: stevdart
Date Posted: February 15, 2005 at 10:35 PM

did some calculations
and a box for one subs comes out to
Depth = 7.2 inches
Height = 19.44 inches
Width = 12 inches
That's what you wrote. The width is too small for the sub, the depth is not deep enough....just play around with the numbers and the room you have to work with to get a box that will fit the subs, give enough air volume, and fit the vehicle.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Posted By: doctorspies23
Date Posted: February 28, 2005 at 8:34 PM

you could construct your enclosures rectangular 15"w X 12.5"h X 15"d 1.02 cu. ft each if you want 2 seperate boxes or 31"w X 12.5"h X 15"d and come out with 1.02 cu. ft for each chamber. that's counting the displacement of the divider between chambers.. OR if you want to make a box that will be possibly make a better enclosure, you could build a wedge box to fire the woofers up and towards the back of the vehicle. use these measurements to build the most suitable enclosure. 31"w X 15"h1 X 7.5"h2 X 15"d to get 1.02 cu. ft. per woofer.

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SPIES

Posted By: Poormanq45
Date Posted: March 01, 2005 at 2:01 PM

Hmm.. This sounds like a job for the good ol' Isobarik enclosure design. posted_image .

Two subb mounted in one box with one directly behind the other with the airspace between them completely sealed. This creates a constant pressure area between the drivers. Overall, you will achieve a ~3dB increase across the entire frequency range of the subs, the low frequency extension should be lowered by ~1/4~1/3 octave, and you'll get the sound quality of a sealed enclosure.

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Posted By: doctorspies23
Date Posted: March 01, 2005 at 8:17 PM

the isobaric design would be more suitable if you were looking to place these subs in a enclosure that is half of what the specs for your woofers call for. however you will have to be specific with your measurements of your enclosure. though it sounds like a great idea, you will only be getting the same amount of sound out of the pair in this type of enclosure as you would for one sub in an enclosure built by the speaker specs.

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SPIES

Posted By: ss-installer
Date Posted: March 03, 2005 at 5:59 PM

just go 12x12x12+sub volume, that will give you 1 ft3 per chamber.

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Posted By: Texas_4485
Date Posted: March 05, 2005 at 6:23 PM

Are you opposed to running a ported box?

Are the speakers going to be run Parrallel, Series or Seperate channels?

If the deminsions that you are giving are the outside with 3/4 MDF then it is two small.

I could help you with the measure ment if you give some measurements of the location you are mounting this box in. The measur ment that I am most interested in is the width.

Texas_4485