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View Full Version : SA-12 Flush Mount Kerf Port Box Design



MikeyL
01-23-2014, 03:42 AM
This is for a 2003 Mustang GT if it'll fit after taking out my factory amps and sound box.

I'll do the measuring tomorrow to see if it's even possible.

The design I came up with is 36" wide, 14.25" tall, and 12" deep with a flush mount double baffle. L-Shaped port 12.75" tall, 1.25" wide, and 20" long. According to Torres it's 1.92ft^3 net with 30.99hz tuning.

http://i345.photobucket.com/albums/p362/MikeyL95/Mobile%20Uploads/A40E1D9A-6088-4F65-946E-8A986BF1C6F3_zpsivujmvz7.jpg (http://s345.photobucket.com/user/MikeyL95/media/Mobile%20Uploads/A40E1D9A-6088-4F65-946E-8A986BF1C6F3_zpsivujmvz7.jpg.html)

How does this look and do you guys think it'd be a good sounding box facing towards my backseat?
Also, for the kerf, fill it with wood glue and screw it into place so it'll hold while the glue dries and forms the shape or is their a better way? Would fiberglassing and/or body filling over the wood glue and slits produce a better sound than if I didn't?

Jeffdachef
01-23-2014, 04:08 AM
fiber glassing will add more rigidity to the structural integrity of the box and it might help sound a tad bit by making the bass travel through a smoother surface but main thing is to make the kerf and overall box more rigid.

MikeyL
01-23-2014, 05:14 AM
How does the overall design look?

MikeyL
01-23-2014, 05:59 AM
Also, if I fiberglass the kerf and all of the joints would I still need a 45 type piece on the inside of the kerf?

Had a guy on Facebook point out how little port area I had so I tried to make another design.

http://i345.photobucket.com/albums/p362/MikeyL95/Mobile%20Uploads/EB9856B1-BDDB-4183-A4AA-3007657085F6_zps3ffolp90.jpg (http://s345.photobucket.com/user/MikeyL95/media/Mobile%20Uploads/EB9856B1-BDDB-4183-A4AA-3007657085F6_zps3ffolp90.jpg.html)
http://i345.photobucket.com/albums/p362/MikeyL95/Mobile%20Uploads/0E7C7D93-82D9-4D96-8CBB-0CE4377C75EC_zpsbnjtwf66.jpg (http://s345.photobucket.com/user/MikeyL95/media/Mobile%20Uploads/0E7C7D93-82D9-4D96-8CBB-0CE4377C75EC_zpsbnjtwf66.jpg.html)

n8skow
01-23-2014, 12:06 PM
26546793

MikeyL
01-23-2014, 01:45 PM
Sorry I don't know all of the terms. I've just been trying to learn more lately.
My last box was designed for me and I just built it.

Anyway, what do you think of the overall box itself?

marcos65
01-23-2014, 01:57 PM
You need to out a 3 in the common walls for this enclosure. That will change your air and tuning.

CaptainMaximus
01-23-2014, 01:58 PM
Why are you tuning that low?

MikeyL
01-23-2014, 02:52 PM
I changed the common wall to 3 and and it dropped the tuning to 27-28.
I guess I have a few more adjustments to make to get it right.

What would y'all recommend for a single SA-12? I want it loud and able to hit low. It's getting 14.3v toy Hifonics BRX1100.1 now and when this box goes in I'd be swapping my CCA Kandy Kable for Knukoncepts Kolossus for the power/ground and big 3 which is also CCA Kandy Kable right now.

MikeyL
01-24-2014, 01:41 AM
Found the video on youtube from CarAudioFabrication of their 2ft^3 35hz tuned box for a SA-12 here:

Sundown SA-12 Subwoofer Box Design - FREE - CarAudioFabrication - YouTube (http://www.youtube.com/watch?v=1IhmNHrtmmk)

What do you guys think of this box? Would it be better than the one I've been working on.

bbeljefe
01-24-2014, 01:29 PM
Your box looks fine and if you want low end extension, tuning at 30Hz is fine. What you'll give up with that tuning is a little bit of SPL but it shouldn't be noticeable.

Also, your terminology is fine. A kerf is a radial bend and it's called a kerf in woodworking because the saw blade's kerf (width) is what's used to create the radius bend. So calling the radius bend a kerf kinda tells someone how the bend was created in addition to telling them that it exists.

As for strengthening the kerf, you can use wood glue or fiberglass. Body filler won't help much with strength but it is useful for smoothing things out. And if you use the wave guide on top of the kerf, you won't need anything more than glue.

Kelvartis
01-24-2014, 02:41 PM
Box looks fine to me and kerf ports look really nice when they're all sanded smooth and perfect when it's done. Initial design with 1.25 sounds like it could use a double check on the math to see if port speed would be too high and cause some noise.

bubbagumper6
01-24-2014, 03:51 PM
Only 8.3 sq in of port per cubic foot, seems awfully low to me.

MikeyL
01-28-2014, 02:44 PM
So I decided I didn't want to do a kerf. I'd rather have some more box building experience and experiment some with kerfs before making a box with one intended for using. I've been up all night which makes me hyper/productive so I threw together another design. My goal was almost as wide as my trunk opening (32") and just under the height (14") and then adjust the depth and port to get the size/tuning I wanted. I like the look of the indented sides where the top/bottom/front/back all overlap the sides by ~3/4" so I made the box 31.5" wide and, due to the 3/4" overlap each side, used 30" as the measurement for the calculations. The sketchup is 13.75"Hx30"Wx15.5"D with port size of 12.25"Hx2.5"Wx35"L. In the sketchup I have the depth at 16" instead of 15.5" (oops) but if I do follow through with this design I'll do a final rendering to make sure I have it exactly like I plan on assembling it.

I'd greatly appreciate the input of y'all who probably almost all have more box building/designing knowledge than I do.

http://i345.photobucket.com/albums/p362/MikeyL95/Mobile%20Uploads/B7CB110D-7BC1-4D9A-AC25-FA0FBD27B439_zpsql9bafx1.jpg (http://s345.photobucket.com/user/MikeyL95/media/Mobile%20Uploads/B7CB110D-7BC1-4D9A-AC25-FA0FBD27B439_zpsql9bafx1.jpg.html)
http://i345.photobucket.com/albums/p362/MikeyL95/Mobile%20Uploads/2B29C7CC-2B4B-49FF-9D10-67B590526589_zpsfvg81eu3.jpg (http://s345.photobucket.com/user/MikeyL95/media/Mobile%20Uploads/2B29C7CC-2B4B-49FF-9D10-67B590526589_zpsfvg81eu3.jpg.html)
http://i345.photobucket.com/albums/p362/MikeyL95/Mobile%20Uploads/7C5EAFF8-8651-4CC2-B821-9E07FC8F847A_zpswyddzly3.jpg (http://s345.photobucket.com/user/MikeyL95/media/Mobile%20Uploads/7C5EAFF8-8651-4CC2-B821-9E07FC8F847A_zpswyddzly3.jpg.html)

keep in mind because of the extra 1/2" the port would be maybe a full inch wronger if I'm thinking correctly so it wont be as short.

Thanks guys.

mklett33
01-29-2014, 02:35 PM
Found the video on youtube from CarAudioFabrication of their 2ft^3 35hz tuned box for a SA-12 here:

Sundown SA-12 Subwoofer Box Design - FREE - CarAudioFabrication - YouTube (http://www.youtube.com/watch?v=1IhmNHrtmmk)

What do you guys think of this box? Would it be better than the one I've been working on.

This box would destroy all ;)

ancorp
01-29-2014, 05:26 PM
The last one you designed looks great. 2 cubes at 32hz with just over 30" of port area should do you quite well.

MikeyL
01-29-2014, 05:37 PM
With the S shaped port?
I like it and think it'll look better once I do a final rendering so the depth is 1/2" less like it was in Torres and the port is fixed. Won't look as short on the end piece.

mklett33
01-31-2014, 02:14 PM
With the S shaped port?
I like it and think it'll look better once I do a final rendering so the depth is 1/2" less like it was in Torres and the port is fixed. Won't look as short on the end piece.


You have 14.5" of depth, why add more bends to the port than what you need? You could easily run that port along the back wall.

n8skow
01-31-2014, 02:34 PM
^This
That curvy port looks cool, but your sacrificing a bit of efficiency, and making it more complicated than it needs to be...


You have 14.5" of depth, why add more bends to the port than what you need? You could easily run that port along the back wall.

RangerDangerV2
01-31-2014, 02:52 PM
26546793

okay Benda.