Subwoofer box design - Defender Source
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  #1  
Old February 10th, 2006, 10:37 PM
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Subwoofer box design

I would like to build a box for a 12in sub that will fit behind my rear seat (ST). Anyone have plans for one or do I have to figure it out and make it myself and post up.

I just found my old punch 200 and 12 orion sub (two of them actually) and I am sick of not being about to hear the radio.



Ron
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  #2  
Old February 10th, 2006, 11:36 PM
artm
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Arthur Maravelis
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I don't have a sub but here's some tips:

1. try to find the acoustic parameters of the sub. Then find a program to get you the right volume for a desired low frequency cutoff. For an auto environment, and a reasonable box size, I would think 30Hz is a good target. To keep the box size manageable, choose a vented design (with a hole in the box). If you can find this sub used in an existing box (vented) and also know the cutoff frequency, and it is acceptable, just measure the box's volume and, if possible, the hole diameter.

2. once you select a volume, build your box out of particleboard, 3/4" thick. Use glue for everything. Cut 3/4" square cleats and butt joint all sides. Try not to select dimensions with whole numbers. Any size box will work - as long as the volume is correct and you have room for the vent (hole). When determining box parameters not only will you get the volume and vent diameter but also the vent length. Place the hole onthe same side as the sub and glue a plastic tube inside the box where the vent is - your vent length. This isn't critical for an auto application but some vent tube is better than just a hole.

3. drill a couple of holes in the rear to attach the terminals - screw down is best. Run the wires inside to the sub's connectors - extension cord cable is fine and cheap. Line the inside of the box with polyester fill (as in pillows) but leave the area behind the vent tube free of fill.

4. screw down the sub and stick a grille in front of it. Paint the box anything you want or cover it with carpet.


Now you can simply pick a box size that fits in your space but you won't get the optimal performance out of your sub without some calculations - unless you're extremely lucky. There is a science behind speaker box design but it's real simple. There are places online that give you access to design programs to make the right box. If you can't get your driver parameters then it's a crap shoot. However, ANY decent manufacturer provides these with all their drivers.

This assumes you'll use one 12" driver. Two is overkill unless you're one of those.

For my taste, a Bazooka-type (tube box) with a 6-8" driver is more than enough. The 6" fits behind the rear seats (SW) and one on each side makes serious volume (even cranked up to 11).
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  #3  
Old February 11th, 2006, 01:08 AM
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I am just building a strait sealed box. They will run in anything from 1 cubic foot to two cubic feet happily. I have the 3/4in MDF already. I just wanted plans so I did not have to find a calc to do the angles.

I am only running one of the two twelves I have. I could not fit a big enough box for two.
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Old February 11th, 2006, 01:57 AM
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Jim Cheney
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I think you should just modify a pelican case into a woofer box. Oh wait, you're cheap
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  #5  
Old February 11th, 2006, 05:29 PM
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Quote:
Originally Posted by JimC
I think you should just modify a pelican case into a woofer box. Oh wait, you're cheap
Yeah, he must have found the MDF on the side of the road! I can't see him buying it!
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  #6  
Old February 11th, 2006, 08:54 PM
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You guys know me too well. I found the MDF in my parents garage. If it is not enough I have an old countertop in my basement I can use that for a panel or two

I also found a box of galvanized drywall screws under my deck a couple years ago. So all I really have to pay for is a tube of liquid nails. Wait . . . let me check my dad's shed . . .

Ron
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  #7  
Old February 11th, 2006, 09:02 PM
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Arthur Maravelis
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Regular yellow glue works fine - and it's cheaper.

You're gonna need some filler material, preferably something that won't mold.
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  #8  
Old February 11th, 2006, 11:06 PM
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I have an entire sub-box with an amp and CD changer (needs replacing) that I want to pull out of the '97. It was very well built and the carpet just about matches the stock carpeting. Maybe not what you are looking for since its for a SW but I'll dig up pictures. I want to tear the bling out and maybe keep the box as a storage box since the previous owner did such a good job.

And before you ask, I havent forgotten your seatbelts. We started pulling mods off the '94 and your belts are on the list to try and pull tomorrow.
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Old February 12th, 2006, 12:15 AM
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Thanks CVC. I need a box that goes behind the ST seat so SW probably won't work, however, it would be nice to see the bling

Ron
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