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View Full Version : (2) MA HK12x2 Custom box Design help...



NissanKicker
03-21-2008, 04:11 AM
Hey, I have everything that I need as far as on paper... I was just wondering if ANYONE ( Knowledgeable ) could give me anymore advice, pointers, or point out something that might go wrong with this design.
... I REALLY WOULD LOVE FOR SOMEONE TO SKETCH ME A MODEL... I REALLY WOULD APPRECIATE IT!!!!!

HERE WE GO!
MA HK12x2 Spec'd enclosure ( Ported ):
Cuft: 3cuft
Hz: 38hz
Sq Port: 4x4
Sq Port Length: 14.5"
Number of Ports: 3

Max Dimensions ( 99 Nissan Sentra ):
External Dimensions: 42"L x 22"D x 14"H
Internal Dimensions: 40.5"L x 20.5"D x 12.5"H

SUBWOOFER CUTS!
(2) 11.5" for the sub holes...

BOX CUTS!
Top: 14 x 42 x 22
Bottom: 14 x 42 x 22
Front Wall: 42 x 12.5
Back Wall: 42 x 12.5
Left Side Wall: 20.5 x 12.5
Right Side Wall: 20.5 x 12.5

* NOTE *
... Front wall will have the three ported centered on the bottom, in the middle.
Example:

2 Ports will be on the bottom in the middle, and the third will be centered in the middle stacked on top.
( Think of a PYRAMID, and you'll get the picture )

PORT
PORTPORT

^^^^^^^ LIKE THAT.... Exactly!

PORT CUTS!
* Each port external dimensions is 4" x 14.5"
Top: 4 x 14.5
Bottom: 4 x 14.5
Left Side Wall: 2.5 x 14.5
Right Side Wall: 2.5 x 14.5

* NOTE *
Remember! There are 3 ports. All are IDENTICAL ( Triplets )

To get DIRECTLY in the middle, it'll be:
42" MINUS 8" = 34"...

NOW

34" DIVIDED BY 2 = 17" on each side of the ports

To get DIRECTLY in the middle for the single stacked port, it'll be:
8" MINUS 4" = 4"...

WHICH MEANS

2"s will be on each side of the stacked port, making it centered.

TOTALING

A PERFECT PYRAMID!!

Here is a quick lil' sketch, to give you an IDEA of what I'm picturing in my head.

http://i214.photobucket.com/albums/cc75/NissanKicker/IMAGE_00082.jpg
http://i214.photobucket.com/albums/cc75/NissanKicker/IMAGE_00084.jpg
http://i214.photobucket.com/albums/cc75/NissanKicker/IMAGE_00085.jpg
http://i214.photobucket.com/albums/cc75/NissanKicker/IMAGE_00086.jpg

spl guru
03-21-2008, 04:19 AM
Looks neat, but maynot work well

NissanKicker
03-21-2008, 07:20 AM
Don't take this in the wrong way... Just asking:

1) Why not...
2) Explain...

Anyone else????
... Thanks for the compliment also!

BrianChia
03-21-2008, 07:27 AM
A sketchup only looks pretty, but it looks like you have done all of the math and calculations already for the design. If you were careful and made sure to take everything into consideration when calculating the tuning and airspace, I don't see why it wouldn't work.

NissanKicker
03-21-2008, 07:40 AM
Hmm... about 4 days to come up with everything.
.... Looked @ the factory recommendations, then converted the round ports to square ports. ( Not into the aero thing ).

Hopefully someone will 3D it for me... If not, I guess I'll just have to build and see.

audioarsonal
03-21-2008, 09:45 AM
I have a pair of 12x2's right now for my setup.Did 3cube per chamber 1 4x14 port in each.Then I went less cubes common chamber bigger port and seen some good gain.Just build a couple boxes to see what works best for you, as I am running an SUV.


And did you check on the SX thing???

BrianChia
03-21-2008, 11:49 AM
Remember that a 4" round port is not equal to a 4" x 4" square port.

NissanKicker
03-21-2008, 01:39 PM
I know it's not... I used a conversion formula

4" x 14" long port .... Take 1/2 of the port size & multiply it by itself.

2 MULTIPLIED BY 2 = 4

Now multiply 4 by PIE ( 3.14 ) = 12.56 Sq. Inches of opening EACH

TOTALLING - 37.68 Sq. Inches of opening

Civic_boi334
03-22-2008, 05:50 AM
is changing from L7s to those MA's in 12's worth doin???

NissanKicker
03-23-2008, 01:35 AM
I think so...
... Considering that I've ran '06 L7 12s.... I mean, that hit hard, but I don't like the sound they have went it's alittle overpowered!
... there's a guy that ran (2) zx750.1 on (1) HK12x2... 1800+ rms. And it never distorted the way the L7 ( dual 2 ) did.

mlstrass
03-23-2008, 01:49 AM
I know it's not... I used a conversion formula

4" x 14" long port .... Take 1/2 of the port size & multiply it by itself.

2 MULTIPLIED BY 2 = 4

Now multiply 4 by PIE ( 3.14 ) = 12.56 Sq. Inches of opening EACH

TOTALLING - 37.68 Sq. Inches of opening

That's enough port area for a 3cube box. How big is the box going to be???