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  #1  
Old 05-01-2013, 11:57 PM
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Im trying to design a box for my single 12". Its a NSv1 motor built with Zv3 soft parts. Will be at 1/2 ohm on a Sundown 3000.

This is the first time Ive messed with Torres box calculator. Normally I just draw shit and measure it, figure out airspace, then figure out port, etc. Guessing game.

So I have the box drawn up in sketchup, figured out my 45s to make the port length equal, and figured them into the displacements as well as the sub itself and the dowels I plan to use for bracing. .22 cubic feet total in displacements for 4 tiny 45s, 4 1.5" dowels, and the sub.

I did the math and heres what I came up with for volume of my box in sketchup.

The smaller rear rectangle is 2 7/8" x 14 3/8" x 12", comes out to .287 cubic feet. Bigger main front section is 6 7/8" x 33 3/8" x 12", which comes out to 1.593 cubic feet.

Total is 1.88 cubic feet. Subtract my displacements and you get 1.66 cubic feet. Port is 2.125" x 12" and is 30.5" long. Should put tuning at 34.5hz and about 15.36 inches of port per cube.


I put my outside dimensions into Torres, put the extra baffle in (it will go over the front baffle, including the port, I figured the extra 3/4" into my port length) put my displacements in, put 3 common walls as port, put the port size and length in. Using torres I get different numbers than the math I did earlier.



Halp?
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Old 05-02-2013, 12:27 AM
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Did u remember to calculate in the wood that builds the inner radius of the port, or just the internal volume?
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Old 05-02-2013, 01:16 AM
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Did u remember to calculate in the wood that builds the inner radius of the port, or just the internal volume?
Yes.




Will it be ok to have the sub that close to the port opening?
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Old 05-02-2013, 01:56 AM
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the location of the sub is aweful. you should put it next to the port opening instead of on the oposite end.
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Old 05-02-2013, 03:07 AM
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the location of the sub is aweful. you should put it next to the port opening instead of on the oposite end.
Yeah I didnt think it would work with a shit where I have it and I know it should be to the right but cant put it there due to the box only being 12" deep and the sub being almost 9" deep.
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Old 05-02-2013, 05:24 AM
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recomendations and program response simulation is wrong anyway...it donsn't tell you much...The downfall with program designing...If you know how to basically calulate volume and tuning then take a shot at a balpark value and build 3 different boxes...One of the 3 will be best. Programs suck honestly...
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Old 05-02-2013, 06:25 AM
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im going to toss this in because some forget. The port length and the physical port length arent the same. You build the port wall length from the physical. The port length is just how far the air actually travels through it. Google it if you have too. I bet thats another reason some of your boxes dont do so well
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Old 05-02-2013, 12:35 PM
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im going to toss this in because some forget. The port length and the physical port length arent the same. You build the port wall length from the physical. The port length is just how far the air actually travels through it. Google it if you have too. I bet thats another reason some of your boxes dont do so well
So whats the difference? I see in torres the physical port length and port length are 2 different numbers. I am confused by this. I measure down the center of the port to figure out how long it is. Is this correct?


Im not sure how to get the sub farther away from the port...
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Old 05-02-2013, 12:48 PM
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Originally Posted by KTMrida4life View Post
Yeah I didnt think it would work with a shit where I have it and I know it should be to the right but cant put it there due to the box only being 12" deep and the sub being almost 9" deep.
make a spacer ring to mount the sub to the box if you need a little more clearance for the motor.
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Old 05-02-2013, 12:58 PM
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