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View Full Version : 4 cu. ft at 30Hz PLEASE!



98dime
07-25-2006, 12:40 AM
Can some1 give me plans for a box for 2 12" infinity Reference 1250W tuned to 30Hz with 4 cu. ft?? PLEASE??:D

heres some more info on the sub
http://manuals.harman.com/INF/CAR/Boxes%20and%20Parameters/1250W.pdf

xluben
07-25-2006, 12:48 AM
here's 5 of them:

http://www.caraudio.com/forum/showpost.php?p=1452841&postcount=6

just ignore the driver cutouts in the pics, you can do dual 12's in any of them.

xluben
07-25-2006, 12:48 AM
double post

98dime
07-25-2006, 12:58 AM
Dimensions i have to work with are 41" width by 19" depth by w/e height.

98dime
07-25-2006, 01:05 AM
What can i use in place of terminal cups??

wesl56
07-25-2006, 10:21 AM
What can i use in place of terminal cups??

holes w/silicone

98dime
07-25-2006, 05:22 PM
here's 5 of them:

http://www.caraudio.com/forum/showpost.php?p=1452841&postcount=6

just ignore the driver cutouts in the pics, you can do dual 12's in any of them.

what thickness of wood do those plans use 3/4" or what??

wlmrs
07-25-2006, 05:25 PM
3/4

98dime
07-26-2006, 04:43 PM
Infinity Reccomends 2 cubic feet per sub with driver and port displacements. have it narrowed down to 2 plans here can someone check and see which design would be best????????

http://img10.imageshack.us/my.php?im...25sqin26rm.png




http://img10.imageshack.us/my.php?im...25sqin24qz.png


once again info on subs im using 2

http://manuals.harman.com/INF/CAR/Bo...ters/1250W.pdf

98dime
07-26-2006, 08:57 PM
Can i use these boxes facing up without any trouble??? Sorry im a newb to the car audio world.:D

Can somone please answer my question above. It'll be greatly appreciated.
or design a box for these subs with a center port to specs?? Please newb needs help.

Lakota
07-26-2006, 09:19 PM
Can i use these boxes facing up without any trouble??? Sorry im a newb to the car audio world.:D

Can somone please answer my question above. It'll be greatly appreciated.
or design a box for these subs with a center port to specs?? Please newb needs help.
What kind of car do you have?

98dime
07-26-2006, 10:43 PM
What kind of car do you have?

1998 s-10 extended cab

xluben
07-27-2006, 12:07 AM
yeah, check out kpozr's thread on a box build for ARMY-KILLA (which ended up being scrapped, and a new box for himself).

i came up with this for him:

http://img131.imageshack.us/img131/7013/4cubes34hz625sqiniz6.png

do the 14" x 42" side facing up with the subs on that panel.

or you can play with this site:

http://www.subwoofertools.com/forum/ported-box.asp?Ew=41&Eh=14&Dia=6&Xmax=15&Vd=.08&NumW=2&Vb=4&Fb=30&Qts=&Vas=&Fs=&CE=0

but it seems to think that with that the proper xmax value (11.5 mm for your drivers) you only need a 2.75" wide port. it might be right, but i'd go with more (4"+ wide), that's why in the link i have entered 15mm xmax, so it makes the port bigger. i guess the link and the pic of the plans i threw together for kpozr are pretty much identical :) and they both will save you a lot of leg room compared to a 19" depth like you originally mentioned.

xluben
07-27-2006, 12:07 AM
i hate double posts!

98dime
07-27-2006, 12:37 AM
Ok thanx man, i really appreciate your help!

98dime
07-27-2006, 02:15 AM
yeah, check out kpozr's thread on a box build for ARMY-KILLA (which ended up being scrapped, and a new box for himself).

i came up with this for him:

http://img131.imageshack.us/img131/7013/4cubes34hz625sqiniz6.png

do the 14" x 42" side facing up with the subs on that panel.

or you can play with this site:

http://www.subwoofertools.com/forum/ported-box.asp?Ew=41&Eh=14&Dia=6&Xmax=15&Vd=.08&NumW=2&Vb=4&Fb=30&Qts=&Vas=&Fs=&CE=0

but it seems to think that with that the proper xmax value (11.5 mm for your drivers) you only need a 2.75" wide port. it might be right, but i'd go with more (4"+ wide), that's why in the link i have entered 15mm xmax, so it makes the port bigger. i guess the link and the pic of the plans i threw together for kpozr are pretty much identical :) and they both will save you a lot of leg room compared to a 19" depth like you originally mentioned.


On the link where does it get the 12.5" height from if it is supposed to be 14"?? Should i just ignore the 12.5" measurement and change it to 14"??

Board Dimensions and Quantity
Color Count Width Height
Top and Bottom 2 41 inches 19.75 inches
Red 1 36.25 inches 12.5 inches
Yellow 1 19 inches 12.5 inches
Black 1 39.5 inches 12.5 inches
Green 1 19.75 inches 12.5 inches
Teal 1 14.25 inches 12.5 inches
Violet 1 11.25 inches 12.5 inches

External Dimensions: 41 wide x 14 tall x 19.75 deep

xluben
07-27-2006, 09:03 AM
because the top and bottom piece are the full 41" x 19.75" all the side pieces will by 12.5" tall (14" minus 3/4" for the top thickness minus 3/4" for the bottom thickness). just take a look at the front baffle of the box drawn in paint and you should see what i mean.

98dime
07-27-2006, 11:06 PM
OK got it pretty much done today. Just have to cut out the holes for the subs, put the back on, finish sealing it up, and carpet it and it'll be done.

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0406.jpg

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0405.jpg - Port peice looks crooked in this pic but its just the camera angle.

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0407.jpg

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0408.jpg - the back peice

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0410.jpg

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0411.jpg

xluben
07-27-2006, 11:18 PM
good work!

98dime
07-28-2006, 02:54 PM
Here she is, all done except for carpet, im going to find some pretty soon. Did have a litttle trouble with one of the holes, cut it a little too big but its not a problem and still seals up fine.

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0421.jpg

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0416.jpg

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0415.jpg

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0417.jpg - made sure it was seald up. lol

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0414.jpg

xluben
07-28-2006, 06:37 PM
very nice!

soul05
07-29-2006, 12:24 PM
is that mdf? looks kinda funky

AcidicDreams
07-29-2006, 12:31 PM
is that mdf? looks kinda funky

that's what I was thinking.... and unles it's baltic birch or MDF it's time to scrap that whole box and start over... plus I think that box could use a brace or two...

IamDeMan
07-29-2006, 12:39 PM
Did have a litttle trouble with one of the holes, cut it a little too big but its not a problem and still seals up fine.

Router and jig FTW. ;)

98dime
07-29-2006, 11:09 PM
Yes its mdf, it wont flex its strong enough for my fat *** to sit on w/o flexing. Dont have a router, i used a jigsaw but its a pos, and i made hole one 2/16 bigger b/c i read my measurements wrong. *It's all good. Good enough for my 1st box and better than a bought sealed one. Carpeted some today still need 2 do side panels and trim it up, wasnt motivated today, it was 94 degrees with 90% humidity!

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0430.jpg

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0431.jpg

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0432.jpg

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0433.jpg

kpozr2
07-29-2006, 11:12 PM
is that goin in a ext cab s-10?

98dime
07-29-2006, 11:15 PM
is that goin in a ext cab s-10?

yup, it fits perfect, dont even hve to cut my jack bracket out, seats all the way back no clicks lost.

kpozr2
07-29-2006, 11:19 PM
isnt there a 'hump' along the back wall of the ext cab? is it just leaning forward against the seats or are you supporting it with someting to make it sit level?

98dime
07-29-2006, 11:26 PM
I made 2 blocks to space it so it will sit level, im going to cover them in the same fabric, wont even notice they r there. i didnt want to cut the box so it would fit the floor, i would prolly screw it up. lol

98dime
07-30-2006, 06:47 PM
The box is done! Just have to run all my wires for my amp and put it in. Sometime next week hopefully.


http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0444.jpg

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0445.jpg - trim to cover seams, going to be replaced with a diamond plate sheet soon hopefully. Have a way to keep it from rattling.

http://i43.photobucket.com/albums/e369/MastaE1024/DCP_0448.jpg