3 Memphis 15-M3MOJO12 Enclosure Design Help

[lionfamlee]

Hello all! I am trying to design an enclosure for 3 Memphis 15-M3MOJO12's (12 in). I am not that familiar on how to do this. It will be going in a 1997 GMC Suburban (V8 5.7 Liter), so I guess subs up and port back. The enclosure can be as ling as 48-49 in in width. That is my only limitation as there is plenty space back there because I removed the 3rd row seat. I will be running a AudioQue 3500.1D amp on all 3 subs. Below are the specs for the subs and the recommendations from Memphis on box specs

http://www.sonicelectronix.com/item_10346_Memphis-15-M3MOJO12.html

ttp://www.memphisca...ommendation.pdf

I will be eventually be building a box for 6 Mojo's as I actually have 6 of them, but I need to put in another 350 Amp alternator to run another AQ 3500.1D. I am tryign to find a decently priced dual alt bracket or have someone make one. I got 1 quote for over $500, seems a bit much to me, could be wring though

Thanks so much!

[lionfamlee]

bump

[lionfamlee]

bumpety bump

[Joe X]

Here is a suggestion:

Enclosure Specifications:

Fb = 35 Hz
Vb = 6 ft^3

External Height = 18.25 in
External Width = 46 in
External Depth = 22 in

Port Width = 24 in
Port Height = 4 1/8 in

Cut Sheet List:

* All Dimensions in Inches.
* Wood Thickness is 3/4 for all Parts.

External Enclosure Parts:

2 x Top & Bottom (3 parts) = 46 x 22

Left & Right Sides = 20 1/2 x 16

Front & Back = 46 x 16

L Port Internal Assembly Parts:

Front to Back = 16 3/8 x 25 1/2
Extension = 3 1/2 x 25 1/2

Port Left Side Assembly:
16 3/8 x 4 1/8
8 3/8 x 4 1/8
Port Right Side Assembly:
16 3/8 x 4 1/8
8 3/8 x 4 1/8

Assembly guide (generic dimensions):

Important notes:

- The 45s if you want to do them are 2 1/2" wide except the one/ones inside the port, if you want that let me know.

- All boxes built outside the car need to fit in their way in not just have the right dimensions.

- The port needs 4 1/8" of free airspace in front of it for proper operation.

- Setting your amp subsonic filter to 28Hz is suggested.

[lionfamlee]

Joe X - Excellent!!! I will be picking up the wood this weekend. Question...what should I use for the internal bracing...2x4? I have seen people uses metal screws/pins to help with bracing any recommendations.

Also, is there a way that you could do a design for 6 Mojo's for my Suburban. I will be building the box above and then upgrading to the new box once I get dual alternator bracket (this winter hopefully).

Man I really do appreciate the work you put into this. I'm pumped...it should get loud and low!!!

[Joe X]

You're welcome, on the bracing I would just use wooden dowel rods, what's also important is doing the port brace since the top to bottom crossbrace is supported on that and that's besides it's function.

The 6 subs box would probably be done doing a second row of 3 subs and tweaking the size of the box and the port area.

[lionfamlee]

thx!!!!!

[lionfamlee]

Joe x,

The Extension = 3 1/2 x 25 1/2 is that the brace for the port? Also, when I upgrade to six subs I will just add another row with the 46x22 to extend it, but the port....would I just extend the port all the way back to the back of the box like this design.

Thx man...oh what program do you recommend for box design....

[lionfamlee]

I m trying to find software that does a picture of the box

[Joe X]

Here's an explanation of the port parts: