Need help with box for a couple sa-12's

[matj1990 11]

max dimensions are 17"h x 31"w x 27"d

i will be running a crescendo bc2000

thinking pretty much the same thing anton miller has setup in his cavi it seems to be really efficient

i want to be able to hit the low's really well so im thinking 30hz tuning ?

this is what i have come up with so far

27w x 16h x 25d using 3/4 mdf should get me 5 cubes

after sub displacement of .14 i should be at 4.72 using a 6" aero tuned to 30hz i need 14.5 inch flared and with port displacement i should be at around 4.5 cubes witch is max recommended for the sa-12's

if im doing something wrong please let me no i plan on building tomorrow

[matj1990 11]

And yes i amp a complete noob when it comes to building a sub box

[S.DeYoung 967]

First of all: in my opinion that is not enough port area. Would you consider building a slot port?

[matj1990 11]

First of all: in my opinion that is not enough port area. Would you consider building a slot port?

rather stick with aeros so i can always re-tune easy

why do u think not enough port area ? worried about port noise ?

[backyardbass97 0]

i can send you a design for free just send me your email in a pm and no thats not enough port area

[matj1990 11]

thought i would post a link of the box im thinking of making i believe he is using only a 6" aero ?

[backyardbass97 0]

pm him and ask

[matj1990 11]

i did a while ago said on Facebook said it was 6" and 5 cubes i think

btw i did pm you

and what do you think i should use

[backyardbass97 0]

let me work on the design and ill let you know what will work

[matj1990 11]

let me work on the design and ill let you know what will work

sounds good man anton said that where his port is placed gave him the highest spl btw apparently he does allot of testing idk im a noob lol so just throwing it out there

[S.DeYoung 967]

What is the xmax of the SA-12?

[Micksh 16]

Believe they publish 19mm one way

[S.DeYoung 967]

Alright I just found that. So we have 19mm xmax, two 12" woofers and tuning @ 30hz? I come up with 8.92 MINIMUM diameter if using round ports. If using slot port then 62.45 inches.

[matj1990 11]

Believe they publish 19mm one way

i believe you are correct

[matj1990 11]

Alright I just found that. So we have 19mm xmax, two 12" woofers and tuning @ 30hz? I come up with 8.92 MINIMUM diameter if using round ports. If using slot port then 62.45 inches.

so am i looking at 3- 3" aeros ? idk lol remember im shopping at home depot so what should i be using

[S.DeYoung 967]

I would go with three 4" aeros. I buy mine from parts express. They are the psp brand. The problem you need with three 4" is they each have to be 22" long. Could you raise tuning to 33hz? This would mean you wouldn't have to cut them down, since they come in 17" kits.

[matj1990 11]

I would go with three 4" aeros. I buy mine from parts express. They are the psp brand. The problem you need with three 4" is they each have to be 22" long. Could you raise tuning to 33hz? This would mean you wouldn't have to cut them down, since they come in 17" kits.

length is not a huge deal i am making them out of pvc

Edited July 22, 2011 by smokey

[S.DeYoung 967]

Well if you are making them yourself. Three 4" Pvc ports. Each 22" long.

[backyardbass97 0]

in a 3.5cube box should do good

[matj1990 11]

in a 3.5cube box should do good

where do you get 3.5 cube ? im looking at 4.5

also does port displacement effect tuning ? do you calculate port size before or after port displacement

and what is 3 4" 22" long aeros going to displace ?

Edited July 22, 2011 by smokey

[S.DeYoung 967]

It will displace .48 cubic feet

[matj1990 11]

so i would be looking at roughly 4.24 cubes

[S.DeYoung 967]

Port size does effect tuning. So when figuring out box size you need to take size + port and sub displacement. Just adjust the total size and make it a little bigger. If you can't go bigger adjust the size to 4.25 and refigure port length and displacement will change.

I have had great luck with two 12" SA-12s tuned to 32hz and 4.0cubic feet.

[matj1990 11]

Port size does effect tuning. So when figuring out box size you need to take size + port and sub displacement. Just adjust the total size and make it a little bigger. If you can't go bigger adjust the size to 4.25 and refigure port length and displacement will change.

I have had great luck with two 12" SA-12s tuned to 32hz and 4.0cubic feet.

so what am i looking at with my current configuration ?? would be like 31-32hz right? becuase now im lost lol

what do i need to size wise to get my 4.5 cubes and 30hz ?

my max dimensions are in first post btw

Edited July 22, 2011 by smokey

[S.DeYoung 967]

On my phone right now. I can recalculate here in a bit. If those are your max dimensions, stick with the numbers above. Tuning may change 1 to 2 hz but it won't be noticeable.