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View Full Version : Brahma+hatchbck=box ?'s



FASTIMES
04-15-2008, 08:31 PM
I recently obtained a 15" Brahma MKI. I ended up throwing it into a box I already had here at the house. Thing is I have no clue on the specs,(what it's tuned to;cu.ft?). If someone could run the math for me it would be greatly appreciated:D.
I know the chances of it being close to what it needs to be are slim..so what I'll need to do is have one of you guys help me,(paypal a few $'s) w/the plans:). lmk if any ?'s. thank you in advance.

http://i262.photobucket.com/albums/ii119/FASTIMES79/IMG_0153-1.jpg

http://i262.photobucket.com/albums/ii119/FASTIMES79/IMG_0153-2.jpg

http://i262.photobucket.com/albums/ii119/FASTIMES79/IMG_0157.jpg

galacticmonkey
04-15-2008, 09:34 PM
See signature. I can do one.

tommyk90
04-15-2008, 09:36 PM
Box doesn't look too bad actually.

I would do the calculations for that port, but I'm lazy and don't feel like doing all the math. :)

FASTIMES
04-15-2008, 09:42 PM
Box doesn't look too bad actually.

I would do the calculations for that port, but I'm lazy and don't feel like doing all the math. :)

Thanks. but you know if its not anywhere close to the rite tuning, then its basically worthless.:crap:

BrianChia
04-15-2008, 10:00 PM
I can design this for you if you need.

boltpride
04-15-2008, 10:02 PM
he said he has that box. needs to know the tuning of it...

FASTIMES
04-15-2008, 10:26 PM
he said he has that box. needs to know the tuning of it...
yes, correct I would like to know HOW much it is off, when I built it I built it to the car not the speaker if ya know what I mean=no specs.


I can design this for you if you need.

thanx,"Basically guys, what I really am asking for is simply the plans for the port in my box, because the box above is built to the max measurements, its just the port thats not built to any kind of spec."

ChedNompton
04-15-2008, 11:56 PM
I am probably way off on this, but I think its 4.9 CF tuned to 32hz. This wasn't accounting for wood thickness.
Good luck,
Larson

galacticmonkey
04-16-2008, 12:12 AM
I got a design finished for ya that I think would better suit what you want out of it. PM me back when you can.

FASTIMES
04-16-2008, 12:13 AM
I am probably way off on this, but I think its 4.9 CF tuned to 32hz. This wasn't accounting for wood thickness.
Good luck,
Larson

Thax alot buddy,even if its off.:D

FASTIMES
04-16-2008, 12:52 AM
I got a design finished for ya that I think would better suit what you want out of it. PM me back when you can.
pmed

FASTIMES
04-16-2008, 12:53 AM
still open to anybody that feels like taking a go at it.

miker
04-16-2008, 07:32 AM
So, you want to know about the current box first?..

What is the port length? Or tell me the length of all the pieces to the port

Immacomputer
04-16-2008, 08:06 AM
We can't tell you anything without knowing the actual inner port dimensions. If you want to know the tuning, play some test tones starting at about 45hz and work your way down to about 25hz. Somewhere between there, the cone should move less and less and the port will move more and more. The point of least excursion is the tuning frequency of the enclosure. This will get you closer to the actual result than we would trying to guess your actual port length.

iDesignBoxes
04-16-2008, 09:11 AM
Internal volume, minus port displacement, but not driver displacement is 4.174 cubic feet. The box has a port length of 19 inches, tuned to right around 33Hz. Keep in mind that this is without subwoofer displacement and this could change significantly after the driver's displacement has been subtracted from it's overall internal volume (again, minus the port displacement). What is the displacement of the subwoofer?

BrianChia
04-16-2008, 09:41 PM
Check your PMs.