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Old 12-11-2008, 12:42 PM
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Default Need help with my box design

Ok this my first time tring to design a box. So i'm looking for some advise on this design.
The box is 14H x 39w x 18 D
3.39 cu ft atfer speaker & port displacement (1.70 cu ft per speaker)
50 sq of port area (14.75 sq per cu)
tuned to 35 hz (4" w x 25" L

Question start here!!!
1)Did I do the port right?
Its 4" wide x 14.5" L and then branches off to 2" w x 10.5" L (both ways)
2)Are the kerfs the right size?


I started with a sloted port. Then measured back 2"(half the port opening) to start the bend. I did the same thing to the inside port. will this keep my port size =.
3) Do I need to 45 the other two corners? I did the corners close to the port. Also are they done right? I also measured back 2" from the inside corners to get the size of the 45's


4)Are the bracing i got good enouch? Did I go over borad on the bracing and how do i get the dispacement on it? I don't want to below 1.5 cu ft per driver. also will the bracing effect my tuning alot? The braceing is 3/4 mdf with the spaces cut out. I'm tring to keep the port from flexxing as well as the walls. The brace in the port will 1/2 in dia going thru 3/4 mdf. All will be rolled over.
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Old 12-11-2008, 12:53 PM
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what subs are you using? Port stuff I really don't get into much as I am more of a sealed box person. But the bracing, IMO, really is not needed. With 3/4" mdf and such a small size per woofer, it's kinda overkill. I really don't start to think about bracing till I hit the 3 cuft mark.
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Old 12-11-2008, 12:58 PM
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Quote:
Originally Posted by thecartel View Post
Ok this my first time tring to design a box. So i'm looking for some advise on this design.
The box is 14H x 39w x 18 D
3.39 cu ft atfer speaker & port displacement (1.70 cu ft per speaker)
50 sq of port area (14.75 sq per cu)
tuned to 35 hz (4" w x 25" L
Looks nice for you first attempt.
Quote:
Originally Posted by thecartel View Post
Question start here!!!
1)Did I do the port right?
Its 4" wide x 14.5" L and then branches off to 2" w x 10.5" L (both ways)
I didn't check the length but you did the rest right.
Quote:
Originally Posted by thecartel View Post
2)Are the kerfs the right size?

I started with a sloted port. Then measured back 2"(half the port opening) to start the bend. I did the same thing to the inside port. will this keep my port size =.
The kerf is 1/4 of a circle so I usually measure into the corner of the bend to find the center of the circle and then use the circle tool to draw the kerf. size of the kerf is up to you, 2" will work but I prefer 3.5" just for looks.
Quote:
Originally Posted by thecartel View Post
3) Do I need to 45 the other two corners? I did the corners close to the port. Also are they done right? I also measured back 2" from the inside corners to get the size of the 45's
You don't need any more 45's and the size loos about right.

4)Are the bracing i got good enouch? Did I go over borad on the bracing and how do i get the dispacement on it? I don't want to below 1.5 cu ft per driver. also will the bracing effect my tuning alot? The braceing is 3/4 mdf with the spaces cut out. I'm tring to keep the port from flexxing as well as the walls. The brace in the port will 1/2 in dia going thru 3/4 mdf. All will be rolled over.[/QUOTE]


I wouldn't put any bracing in the port. The bracing inside the box looks good. To figure out the displacement first figure the displacement of the whole piece then subtract the displacement of each piece you cut out of it.

If you are confused by any of this let me know and I will try and do a better job explaining it.
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Old 12-11-2008, 03:22 PM
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Quote:
Originally Posted by rollerdj View Post
what subs are you using? Port stuff I really don't get into much as I am more of a sealed box person. But the bracing, IMO, really is not needed. With 3/4" mdf and such a small size per woofer, it's kinda overkill. I really don't start to think about bracing till I hit the 3 cuft mark.
Its for a pair of 12" DC Lvl 4 XL with 3k rms on them
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Old 12-11-2008, 03:31 PM
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Originally Posted by SPY View Post
Looks nice for you first attempt.
thanks alot


Quote:
Originally Posted by SPY View Post
The kerf is 1/4 of a circle so I usually measure into the corner of the bend to find the center of the circle and then use the circle tool to draw the kerf. size of the kerf is up to you, 2" will work but I prefer 3.5" just for looks.
3.5 is just for looks?





Quote:
Originally Posted by SPY View Post
I wouldn't put any bracing in the port. The bracing inside the box looks good. To figure out the displacement first figure the displacement of the whole piece then subtract the displacement of each piece you cut out of it.
There is no where else to brace the top and bottom baffle. there is going to be 3k rms on a pair of 12" Lvl 4 XL's. There will be a double top baffle. Will that keep the flexxing down.
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Old 12-11-2008, 03:33 PM
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only thing I see is you have no room for the motor because of the bracing
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Old 12-11-2008, 03:48 PM
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ahh, then I would do bracing if you are going to use that much power. But, like stated above, make sure you have room for the motor.
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Old 12-11-2008, 04:41 PM
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Quote:
Originally Posted by wenn_du_weinst View Post
only thing I see is you have no room for the motor because of the bracing
there will be a double baffle (1.5") the brace is in the middle of the box (7" from the top plate) and the sub is only 7" tall so i'll have 1.5" between the brace and the motor.
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Old 12-11-2008, 04:43 PM
 
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you dont need the "PORT" bracing, all that is gonna do is cause alot of port noise. Where are you mounting the subs? on top with the port firing back? or subs front port front? Make sure you are gonna have clearance. It would suck to build it just to find out it dont fit the subs.
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Old 12-12-2008, 03:36 AM
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Quote:
Originally Posted by thecartel View Post



3.5 is just for looks?
Yes, the larger kerf looks better IMO, but you will not gain anything by going with a bigger kerf.




Quote:
Originally Posted by thecartel View Post


There is no where else to brace the top and bottom baffle. there is going to be 3k rms on a pair of 12" Lvl 4 XL's. There will be a double top baffle. Will that keep the flexxing down.
The port walls will brace the top/bottom panels and the bracing in each chamber will brace the port walls. The bracing inside the port in not needed.
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