View Full Version : Help Me Tune A Box For 3 12's

12-08-2004, 07:30 PM
Hey Everyone,
I have 3 kicker cvr's and It's gonna be in a Big Bronco so i have plenty of space but i wanna build it around my spare tire and angled toward the back window (from what i hear that'll make it a lil louder). SO how would i tune to to 30hz. I really have no idea what that means but from what i read 30hz is good for deep bass and to get some SPL.

How big and long should the ports be?

Here a idea of how i wanna try to build it:
http://img84.exs.cx/img84/3140/speks9qm.th.png (http://img84.exs.cx/my.php?loc=img84&image=speks9qm.png)


12-08-2004, 07:36 PM
ahh hell, its tough, just pay jmac 10$ to make some plans for you

see jmac... im gettin you somebusiness ;) you can sen me those plans for free now :)

12-08-2004, 07:52 PM
Ohh and let me ask a Retarded question.....I was reading somewhere where a dude was talking about how he tuned his box to like 50somthin hz and sombody else was like, but dude, what about the girls, and he said don't worry i have another box tuned to 20somthin hz. SOOO what i'm gettin' at is why is a lower hz better for the chicks? the vibarations ;) or somthing?

12-08-2004, 08:14 PM
umm.. the higher it is like in the 40's the more the spl anything around 43-50 would be for competition only.. 20 is for like pure sq.. and is waaay too low. i doubt u would even hear most of the music.

12-08-2004, 08:40 PM
I i guess i'll try and stay in the 30's

12-08-2004, 08:56 PM
mmm vibrations

12-08-2004, 10:53 PM
do you have any approximate dimensions?

12-08-2004, 11:03 PM
when i had my old ported box with 2 15's it was about 22"deep 22"high and 44" wide

12-08-2004, 11:21 PM
This Big:
It might even be bigger than what i remember but i do know that i don't want it no bigger than that

12-08-2004, 11:43 PM
those ports just look like wholes without the tube. according to bass box pro, the EPB (efficiency) of your sub is 22, so it would do well in a sealed box. if you think you can **** it up and have a sealed box, here are some dimensions that would have each chamber tuned at exactly 30 Hz:

L * W * H

21.75 * 48 * 18

seperated into three equal sections.

12-08-2004, 11:50 PM
sorry, program accidentally assumed heavy dampening was used. the actual dimensions are as follows:

18 * 48 *18

12-08-2004, 11:54 PM
3 ft per sub sounds pretty big for cvr's...

12-08-2004, 11:58 PM
the VAS for the 12 CVR on BBP6 lists 3.278 ft^3. perhaps theyre wrong. i dont know much about the sub.

12-09-2004, 12:08 AM
just checked the kicker wevsite and they also claim 3.28 ft.^3

12-09-2004, 12:09 AM
i had 2 12"cvr's in 1.25 sealed a piece. and they hit pretty hard.. but since i've started building my own boxes, i'd take ported any day. my boxes are tuned between 30-33. nice and low but still loud.

12-09-2004, 12:14 AM
Naw those ports are PVC pipe, bout 6" long.
But anyways your saying that it would be better to have a sealed box. I'm not really set on having a ported box but i always thought with a ported box it would get louder and deeper. I had the 12's in a sealed box before and they sounded like they could do much better, like deeper bass and stuff. But they were in a regular cap truck though.
But thanks for the feedback,

12-09-2004, 12:24 AM
Don't go more than 2.0cuf per chamber. I have the same 12's in a 2.75cuf @ 29hz and it dont play some notes. Don't go above 2.0cuf per side.

12-09-2004, 12:27 AM
Is it ported or sealed?
edit: nevermind, i see your signature