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View Full Version : Need Box Design for 2 12" DD 9512g



Korn4Life
08-22-2008, 03:31 AM
I have a two door 1996 Pontiac Grand Am... I have the backseat out of the car and will be firing the subs forward into the car with the trunk sealed off... I have Max Dimensions of 16" High X 37" Wide X 30 Deep... Can someone come up with a design with drawings and cut sheets... I would like it to be as loud as possible and still have a slightly ok sound to it.... I will be running the subs with two IA 40.1's I will pay for design if need be... Thanks alot for your help...

Korn4Life
08-22-2008, 03:53 AM
Ttt

Korn4Life
08-22-2008, 05:33 AM
ttt

Korn4Life
08-22-2008, 04:56 PM
ttt

mcsoul
08-22-2008, 05:01 PM
T/S parameters for DD 9512g?

Korn4Life
08-22-2008, 05:30 PM
I dunno the T/S Parameters... Maybe someone else knows them or the website has them listed..... Sorry I just have the subs no instructions or specs

Korn4Life
08-22-2008, 05:36 PM
Here is what i got from there site

9500g

Voice Coil Diameter
3"

Magnet Weight
406 oz

Power Handling RMS/Peak
1500/6000

Suspension
80 mm

Nominal Impedance
.35 - 4.0 Ohm

DC Resistance
.35 - 3.6 Ohm

Model
9510g
9512g
9515g
9518g

Rec Box (cubic ft)
1.6
2.6
4.25
6

Port Area (sq in)
32
52
85
120

Port Length (inches)
18
18
18
18

Woofer Diameter
10"
12"
15"
18"

Free Air Resonance
35 Hz
34 Hz
33 Hz
29 Hz

Qts
0.25
0.31
0.29


Qes
0.27
0.33
0.31


Qms
3.1
4.15
4.32


Vas
15L
35 L
85 L


Sensitivity
87 dB
89 dB
93 dB
94 dB

Shipping Weight
50 lbs
51 lbs
55 lbs

ssackett
08-22-2008, 05:39 PM
Contact SPY. He made a good design for my DP's at a reasonable price

ssackett
08-22-2008, 05:43 PM
You going to run aero's or a sloted port?

Korn4Life
08-22-2008, 05:44 PM
Aero's or slot ports it dosent matter which ever one is better for my installation

mcsoul
08-22-2008, 06:02 PM
When they only list three, are they leaving out the 10 or the 18?

Qts
0.25
0.31
0.29


Qes
0.27
0.33
0.31


Qms
3.1
4.15
4.32


Vas
15L
35 L
85 L

mcsoul
08-22-2008, 06:13 PM
Based on the info, they are recommending a
5.2 cubic foot box tuned to 43 Hz.

Rec Box (cubic ft)

2.6

Port Area (sq in)

52

Port Length (inches)

18

Korn4Life
08-22-2008, 06:14 PM
they are leaving out the 18"

Korn4Life
08-22-2008, 06:15 PM
Based on the info, they are recommending a
5.2 cubic foot box tuned to 30 or 31 Hz.

Rec Box (cubic ft)

2.6

Port Area (sq in)

52

Port Length (inches)

18

So would the box be 5.2 cubic feet with 104 Sq in of port @ 18" Deep

mcsoul
08-22-2008, 06:25 PM
No 5.2 plus 104 @ 18" or is that what you meant?

Let me run the numbers, looks like 3 4" areos will be
easiest to build. The tune I came up with was actually
43Hz

Korn4Life
08-22-2008, 06:26 PM
ya that is what I meant

mcsoul
08-22-2008, 06:35 PM
Do you want the box 37" wide or a little less?

Korn4Life
08-22-2008, 06:38 PM
The dimensions that are given are the MAX I can go.. So i guess the smaller the better but ya you can go 37" wide

mcsoul
08-22-2008, 06:47 PM
I'm a little concerned that they are asking for 52 square inches of port
area per woofer and I'm getting an acceptable Mach rating with both
12's and only three 4" areos. Not sure what to recommend.

Korn4Life
08-22-2008, 06:49 PM
Wouldnt it be tuned pretty high with 104 sq in of port... Like 40hz+

mcsoul
08-22-2008, 06:50 PM
yes, 43Hz. WinISD agrees, the default tune is 44Hz for the woofer.

mcsoul
08-22-2008, 07:42 PM
If it were to use three 4" or two 6" (looks better IMO) areos;
It would be easy to describe how to build the box. But DD
wants 104 sqinches. So that means you need a 3" by 34.75
port that is 14.83" deep. Basically a full box width port.

That will require a lot of bracing. That bracing needs to be
accounted for in terms of airspace. I'm not skilled enough
to put that box plan together.

Basically, what your looking at is a 6.39 cu^ft box (including the MDF)

36.25 W x 17" H x 22" D

5.27 cu^ft airspace + 1.12 cu^ft of port

No bracing accounted for, must be a single port to work.
The port would simply be a .75" by internal box width (3" x 34.75")
piece of MDF that is 14.83" deep. No L required. I would need to
recalculate for bracing.

iamamp3pimp
08-22-2008, 07:53 PM
Please be careful with it under tuning, set up the SSF bro.

Please.

Korn4Life
08-22-2008, 08:08 PM
Im glad you guys are helping me with this kinda stuff .. I never got how to figure out the frequency

Korn4Life
08-22-2008, 08:40 PM
tty

mcsoul
08-22-2008, 08:47 PM
He's right, the subsonic filter would need to be set to
2Hz under the box tune, 41Hz; This is an SPL box, I think.

Korn4Life
08-22-2008, 09:07 PM
ANyway to get the tuning a lil lower?

iamamp3pimp
08-22-2008, 09:22 PM
still working it homes, its done, just doing the model now.

tuned really high....

but it should get down very loudly.

just be careful under 35 HZ



http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/Front-bracing.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/Portdepth.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/back.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/bottom.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/frontportdims.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/sidesandport.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/top.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/xray2.jpg


http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/xray3.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/xray1.jpg



Top 24.75 x 34.5
Bottom 24.75 x 34.5
Side 14.5 x 24.75
Side 14.5 x 24.75
Back 16 x 34.5
Front 16 x 34.5
Front 16 x 34.5
Port 14.5 x 17.25



its 5.392 cubes @ 43.85 HZ

iamamp3pimp
08-22-2008, 09:23 PM
if you want me to change it or re-do it at any time, just let me know

iamamp3pimp
08-22-2008, 09:25 PM
this right here should be a great numbers box though....no bends in the port......

Korn4Life
08-22-2008, 10:44 PM
Now that is sweet man... Thanks alot... If I would want to go a lil lower on the tuning would I just make the port longer ?

Korn4Life
08-22-2008, 10:51 PM
IN the pic above the Photobucket sig thingy ... Is the bottom plate suppost to stick out like that? It looks like it is sticking out 3/4"s and the top isnt sticking out... Also does the front plate have to be larger then the first front plate?

iamamp3pimp
08-22-2008, 11:11 PM
IN the pic above the Photobucket sig thingy ... Is the bottom plate suppost to stick out like that? It looks like it is sticking out 3/4"s and the top isnt sticking out... Also does the front plate have to be larger then the first front plate?

no, it wasnt supposed to look like that, thats my bad.....

the bottom piece was actually be building the first front piece

IE: both front pieces are to be cut the same size.

mcsoul
08-22-2008, 11:12 PM
nice! is that google sketch?

Korn4Life
08-22-2008, 11:12 PM
Alrighty that helps out a bit...LOL I was confused there for a minute

iamamp3pimp
08-22-2008, 11:14 PM
if you wanted to lower the tuning, you would move the port to the right, to make it smaller.

lmk if you want to do that, and how much lower you'd want to go.

the DD recommended specs seem to cater to SPL with the large ports, and high tuning.

lower tuning usually means that the port is smaller, and much, much longer (depending on how low you want to go.

honestly id like to see this box built just to see what it does with all that power on it.

iamamp3pimp
08-22-2008, 11:15 PM
nice! is that google sketch?

yup.

takes a bit to get used too, but once you got it, and it seems like you got the hardest part of it (tuning)

you got it.

Korn4Life
08-22-2008, 11:17 PM
if you wanted to lower the tuning, you would move the port to the right, to make it smaller.

lmk if you want to do that, and how much lower you'd want to go.

the DD recommended specs seem to cater to SPL with the large ports, and high tuning.

lower tuning usually means that the port is smaller, and much, much longer (depending on how low you want to go.

honestly id like to see this box built just to see what it does with all that power on it.



Since this box is smaller then I thought It would be I would like to build two boxes for my car... One for SPL (This Box) and one for Daily/SPL

How hard would it be to bring that same box down to 34-36 Hz?

iamamp3pimp
08-22-2008, 11:22 PM
heres a good rule of thumb.

length remaining the same, if the port area is lower, the tuning is lower.

if the port area remained the same, the longer the port, the lower the tuning.


in this case, if you made the port 5 inches wide, and leave the length the same, it'd bring the volume up to about 5.8 cubes @ 35ish hz

iamamp3pimp
08-22-2008, 11:23 PM
Since this box is smaller then I thought It would be I would like to build two boxes for my car... One for SPL (This Box) and one for Daily/SPL

How hard would it be to bring that same box down to 34-36 Hz?

but if you want me to design you a daily box as well, i can do that.

let me go back to the lab and whip up some ish for you


what kind of music do you listen too?

mcsoul
08-22-2008, 11:25 PM
Now that is sweet man... Thanks alot... If I would want to go a lil lower on the tuning would I just make the port longer ?

You do not want to get to close to the back of the box. Right now it's
within 7-8 inches, which is close to the port width. Your going to have
to L at exactly 7.25" inches from the back wall to get the port longer.

Korn4Life
08-22-2008, 11:25 PM
but if you want me to design you a daily box as well, i can do that.

let me go back to the lab and whip up some ish for you


what kind of music do you listen too?

I listen to everything... I like Stuff like Korn but I dont listen to that to loud... The only time I have it cranked is when Im listening to rap...

iamamp3pimp
08-22-2008, 11:31 PM
You do not want to get to close to the back of the box. Right now it's
within 7-8 inches, which is close to the port width. Your going to have
to L at exactly 7.25" inches from the back wall to get the port longer.

only problem is the tuning would get lower, then the volume would go lower, bringing the tuning right back up.

wouldnt be worth it, with that port area.

im working on a daily design now though, shouldnt take that long.

not gonna be all pretty with the braces though.

lol

iamamp3pimp
08-22-2008, 11:31 PM
I listen to everything... I like Stuff like Korn but I dont listen to that to loud... The only time I have it cranked is when Im listening to rap...

seems like no matter what i do these subs are wanting to peak in the low 50's


hmmm

iamamp3pimp
08-22-2008, 11:32 PM
whats up Mike.

I think i got it.

14.5x6 on the port so far


lets see if i can make it all fit.

iamamp3pimp
08-22-2008, 11:33 PM
I listen to everything... I like Stuff like Korn but I dont listen to that to loud... The only time I have it cranked is when Im listening to rap...

you listen to chopped and screwed?

im working on 4.2@34

Korn4Life
08-22-2008, 11:50 PM
Everything Korn I pretty much have and listen to

iamamp3pimp
08-23-2008, 12:06 AM
ok

if it isnt posted tonight, ill have it up by tomorrow.

Korn4Life
08-23-2008, 12:11 AM
Thats cool man I appreciate u going out of your away for these designs

Korn4Life
08-23-2008, 10:06 PM
ttt

iamamp3pimp
08-23-2008, 11:05 PM
just got home from work, and turned on my PC and all my work from yesterday on the new design = gone.

crap.

ill get to it tho

Korn4Life
08-24-2008, 02:02 AM
Thanks again....

iamamp3pimp
08-24-2008, 10:51 AM
got another 5.415 tuned to 33.16 HZ after sub displacements

bracing wont effect enough to matter.....volume will go down less than .1 and tuning will go up less than 1 hz

iamamp3pimp
08-24-2008, 10:55 AM
top 37 x 25
bottom 37 x 25
side 14.5 x 25
side 14.5 x 25
front 37 x 16
front 37 x 16
back 37 x 16
port1 14.5 x 19
port2 5.5 x 14.5

45 = optional 5.5 x 14.5 (wide corner)

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/bottom-1.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/sidesandport1.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/port2andportwidth.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/45-optional.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/backshot.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/rear.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/top-1.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/portwidthandfront.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/xray.jpg

iamamp3pimp
08-24-2008, 10:56 AM
http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/cutsheet1.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/cutsheet2.jpg

http://i35.photobucket.com/albums/d177/iamamp3pimp/Designs/Korn4Life/cutsheet12.jpg

Korn4Life
09-05-2008, 08:40 PM
I just ran these dimensions on RE AUDIO box design program and its coming up to equal only 4.562 cuft!!! IS RE wrong or is this design wrong????????? Please Help

iwearpro
09-05-2008, 09:38 PM
I just ran the numbers on re's site
bw=37
bh=16
btd=25
bbd=25
wood =.75
sq port width=6
sq port 2 length =5.5

all that got you 5.3 cu ft and 32.74 hz

iamamp3pimp
09-05-2008, 09:54 PM
which box?

Korn4Life
09-05-2008, 10:12 PM
The first one

iamamp3pimp
09-05-2008, 10:23 PM
i just ran it again, i get 5.69125 minus the subs displacement will net you 5.39 cubes
when i reverse engineer it in winisd i get the box tuned at `43.79 which is .06 hz off the inital tuning of 43.85

iamamp3pimp
09-05-2008, 10:24 PM
I just ran these dimensions on RE AUDIO box design program and its coming up to equal only 4.562 cuft!!! IS RE wrong or is this design wrong????????? Please Help

i never checked the integrity of the sites calculations but i do stand behind mine.

:)