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Box design for 4 12s?


Thomas

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Well it's starting to get cold and that means its almost time to put the mustang away and get out the jeep. This is going to be a nothing fancy budget build, the goal is to just have something that sounds decent for the least amount of money spent.

Keeping in mind this is only a winter beater i went cheap on the subs, i found kicker cvr's for basically buy one get one free online so i ordered 4 12's. I picked up an older model hifonics 1600 to power them.

The idea here is just to build a box that sounds good. I'm obviously never going to put it on a meter and i could care less what the spl is. This is actually why i need help, i've designed and built plenty of boxes that get decently loud but i struggle with building a daily listening box. I'm hoping to be able to play all different types of music in this thing. Every box i design seems to be a "one note wonder".

So the equipment is

-4 kicker CVR 12"s

- Hifonics Brutus 1600

Going in the rear hatch area of a 97 Grand Cherokee Limited

The max dimensions are

Height-- 19"

Width-- 40"

Depth-- 26"

Keep in mind that the 26" depth would only leave a few inches between the box and the hatch if the port were to be rear facing.

I'm going to be building with 3/4" MDF and am considering the idea of doubling up the face of the box.

As far as tuning freq i'm open for suggestions. Just keep in mind i'm looking for a "musical" type box.

Thanks for any help or advice you guys can give!

m07qf.jpg

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Here is a suggestion, needs 4" of free airspace in front of the port:

Enclosure Specifications:

Fb = 35.8 Hz

Vb = 7.74 ft^3

External Height = 19 in

External Width = 40 in

External Depth = 26 in

Port Width = 24 in

Port Height = 4 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) = 40 x 26

Left & Right Sides = 24 1/2 x 16 3/4

Front & Back = 40 x 16 3/4

L Port Internal Assembly Parts:

Front to Back = 15 1/4 x 25 1/2

Port Left Side Assembly:

15 1/4 x 4

Port Right Side Assembly:

15 1/4 x 4

Assembly guide (generic dimensions):

4xSUPB-1.jpg

Let me know any questions.

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Thanks for the input. Thats actually really close to the box design i came up with. Would this design be good for all around listening and music?

Your dims are a just bit tight but yes I think it would do well on music the way its is right now provided that your front stage is nicely set.

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I'm still somewhat new to this, after punching the numbers into torres I noticed that torres recommends i have 100-122 inches of port area and this would fall to 96 inches. Would it worthwhile to lengthen the port to 20" ? That would bring the tuning down to about 34 hz but would put the port area just inside the recommended specs.

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I'm still somewhat new to this, after punching the numbers into torres I noticed that torres recommends i have 100-122 inches of port area and this would fall to 96 inches. Would it worthwhile to lengthen the port to 20" ? That would bring the tuning down to about 34 hz but would put the port area just inside the recommended specs.

The 12-16 square inches per cube is just a rule of thunb, port area is fine, what I would have preferred is a bit more net volume, like 2 cubes per sub, that could be accomplished increasing the height a little.

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