building an enclosure

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=17337
Printed Date: July 18, 2025 at 7:14 AM

Topic: building an enclosure

Posted By: Focusedonsound
Subject: building an enclosure
Date Posted: August 08, 2003 at 7:33 AM

Ok I hope someone can help me or even perhaps give me the formula to figure out the optimal enclosure along with making it so it will fit in to my car. 2000 Mustang GT Convertible.

Here is what I have

2 Kicker 12in C XPL 2ohm subs

Here are the specs

Kicker recomends a 1.0-1.5 enclosure I would like to be as dead on as possible as to the size of the enclosure. Also What is the formula to find the Volume inside the box.

XPL 2-Ohm Subwoofer Parameters
Model	X15c-2	X12c-2	X10c-2
Nominal Impedance	2	2	2
SPL dB 1W/1M	90.2	87.5	86.4
Displacement, cc	2876.257	1738.503	1149.225
Displacement, CuIn	175.52	106.09	70.13
Hole cutout, in dia	14 1/16	11 1/8	9 3/8
Mounting Depth, in	7	5 1/2	5
Revc	1.82	1.91	1.77
VC Inductance, mH	0.25	0.307	0.288
Sd, SqM	0.0845	0.0511	0.034
BL	8.9424	7.9424	6.5196
Vas, Liters	448.3737	190.3143	107.5755
Vas, CuFt	15.83	6.72	3.8
Mms, gms	156.5733	112.865	76.3787
Fs	19.127	20.911	22.496
Qms	10.853	10.019	9.881
Qes	0.428	0.449	0.45
Qts	0.412	0.43	0.43
Pmax, watts	600	500	350
Xmax, mm	10.35	10.35	10.35

Replies:

Posted By: DYohn
Date Posted: August 08, 2003 at 8:20 AM

Try starting with the "woofer enclosures" link to the left.

Posted By: Focusedonsound
Date Posted: August 08, 2003 at 9:28 AM

ok i have read through the "woofer enclosures" area and am still a bit cloudy on a lot of the areas ...

I read what all of the info means on the Theil Small however I don't understand how to translate that to what size enclosure i should have

Also what if my enclosure is not a box? what if I do something with fiberglass and is rounded ect... then how do i figure out volume. or better yet ... how would i build an enclosure using fiberglass to the proper size?

Posted By: DYohn
Date Posted: August 08, 2003 at 11:21 AM

Check out this page, and then HERE is an interesting project to check out, HERE is also another place for some research.

Calculating the actual volume of a non-standard shaped enclosure requires some knowledge of geometry, but basically you look at the shape and find the squares, rectangles, triangles. cylindars and spheres contained within it, calculate the individual volumes and add them up. There is no easy formula for a non-standard shape, unfortunately.

Posted By: aggie altima
Date Posted: August 08, 2003 at 7:23 PM

what has been suggested before, for finding the internal volume of a non-standard shape enclosure, is filling the enclosure with styrofoam peanuts, and then putting those peanuts in a cardboard box which has a determined volume.