View Full Version : First Box: Need Help w/ Dimensions

SSS 18734
06-13-2005, 03:18 PM
I don't have a box-building program, so I have made the following plans by hand for my 12" Pioneer 2000SPL's.

Pioneer Recommends a 1.75 cu.ft. box for each sub including the speaker and port. I will be building a dual divided box. Both ports are 4" in diameter and 6.5" long. I will be using 3/4" MDF.

I have figured the interior specs of each chamber to be:
Width: 15"
Depth: 18"
Height: 11.2"
That will get me exactly 1.75 cu.ft.

My whole box, with the subs and port facing upwards will have the following dimensions externally, with an internal divider made of 3/4" MDF.
Width: 32.25"
Depth: 19.5"
Height: 12.7"

Sorry for the lack of any diagrams. Can someone plug this into their box-building program and double-check that I will get the proper airspace for each sub?

SSS 18734
06-13-2005, 03:52 PM

SSS 18734
06-13-2005, 08:38 PM
come on, I need someone's input on this before I go and buy $50 worth of materials.

SSS 18734
06-13-2005, 09:27 PM

06-14-2005, 01:23 AM
Comes out to exactly 3.5 after you subtract the 3/4 inch dividing piece.

SSS 18734
06-14-2005, 04:06 PM
ok cool. I guess math class was useful for something after all.

Now I need to go get some wood. If I slipped the guy who cuts stuff at home depot a few bucks, do you think he can cut it precisely?

06-14-2005, 04:46 PM
i dont know math at all.. i **** at building boxes.

SSS 18734
06-14-2005, 08:23 PM
Allright well now that I have my dimensions correct, can someone direct me to a good box building tutorial? I need a list of all the materials I will need as well as good instructions.

06-14-2005, 09:15 PM
dont try to bribe him into doing quality work, it'll probably jsut insult him by saying he does a half-assed job

start talking to him a lot, get all friendly and stuff, then he will cut it good, but their cutting thing itself isnt too accurate but I didnt have any problems with home depot cuts.

- quality wood glue
- drywall screws
- screwdriver
- drill
- drillbit just very slightly smaller than the screws

- a friend to help
- camera to take pics with

SSS 18734
06-14-2005, 09:31 PM
thanks for the tip. By the way what length drywall screws work best?

And can anyone hook me up with a good tutorial on box-building?

06-14-2005, 09:33 PM
10 inchers...

SSS 18734
06-14-2005, 09:35 PM
:rolleyes: im not using 10" screws

06-15-2005, 12:07 AM
crutchfield.com has a pretty good tutorial http://www.crutchfieldadvisor.com/reviews/20030701/build_box.html
also check out
Nice FAQ: http://mobileaudio.com/rac-faq/

06-15-2005, 03:07 AM
If i used screws I would use 1 1/2" screws gives you 3/4" on each piece( I use 1 1/2" brads in my nailgun), but predrill the holes with a bit just a hair smaller than the diameter of your screws so you dont fuxor your mdf.

06-15-2005, 10:37 AM
yea, thats a really good point.

make sure the predrilled holes are just slightly smaller than the screws.
if its too much smaller, it could split the MDF.

and the screws are only there to hold the box together until the glue dries.

SSS 18734
06-16-2005, 10:40 PM
Ok guys, well i've finished the woodwork with the my first box (will take pics later). I think its turning out pretty well. The guy at home depot did pretty nice cuts, one was off but I cut a better one with the spare MDF I had.

I've got a few questions though.

1. Where can I get a nice port? it will be 4" wide, 6.5" long. I want it to be thin and overlap on the front of the box so you cant see the hole.

2. Is it really necessary to silicone the terminal cups in place?

3. Where can I get red automotive carpeting? I'd like it to match the interior of my car.

06-16-2005, 10:55 PM
-aeroport from www.partsexpress.com
-yes, its necessary to seal the terminal cup, after you attach it.
-fabric store maybe, car upholstery shop definitely.