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Old 01-31-2010, 10:52 PM   #1
unparent
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Default HowTo: MDF woofer box for WRX wagon spare tire well. Lots of pics & dimensions, enjoy

A couple years ago I decided it was time to make a box for my '06 WRX wagon. My requirements were for it to be completely stealth, lose no trunk space, use no false floor, and to retain the spare tire. Decided on a box that will fit in the spare tire I know the Duffman box was an option, but I thought it would be pretty easy and fun to do it myself. My system design was focused on SQ, so I went with an Elemental Designs SQ10 shallow mount woofer. Some people love them, some hate them, but I have been really happy with it. Much stronger bass than I expected.

I am a 3D artist by trade, so I took some measurements from the trunk and spare tire so I could model the box in Maya. This really allowed me to get the most of the space, calculate the internal volume, and test dimensions and clearances beforehand. When I posted the pics a while ago, I got a lot of emails and PM's about how it was made, will I make one for you, and do you have dimensions. This weekend I finally compiled the dimensions into a presentable form, so if you want to build one, this should be all you need. Good luck.

What it looks like: (link to gallery)




Some exploded views: (exploded video)


The dimensions: (roughly .39 cu.ft.)












No idea if anyone will use these, but all the info is there. Enjoy and good luck...
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Last edited by unparent; 01-31-2010 at 10:54 PM. Reason: forgot to fill out the title, doh...
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Old 01-31-2010, 11:50 PM   #2
hookedontronics
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why the tapered internal volume? I make these and sell them and i use the same size rings all the way down (except for the first two rings down from the floor), and i'm only getting .625 cubic feet while keeping the spare tire. Is .39 cu. ft spec'd for that sub? Seems pretty small...
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Old 02-01-2010, 12:31 AM   #3
ROFLBOXER
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Woah. Holy Tiny box volume. Sweet design.
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Old 02-01-2010, 07:20 AM   #4
boostdog
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great job man! looks really good.
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Old 02-01-2010, 08:08 AM   #5
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I just got a new one from Duffman and it is bigger than that internally. You are giving up a BUNCH of internal volume if you would take a leap and just try fiberglass. Plus it would be a bit lighter.

I appreciate the effort and the creativity but for a spare tire box to work effectively you really do need to try something other than wood.
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Old 02-01-2010, 10:00 AM   #6
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yes but if it works and he's happy with the way it sounds/looks/weight what does that matter.

how much was your duffman box? willing to bet he has alot less in an enclosure that you do.
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Old 02-01-2010, 10:57 AM   #7
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Yeah its really small, but fits the subs requirements almost perfectly. Sure its not going to fit a normal size 10", but that wasn't the intent of the design. If the goal was a full size sub, Duffman is most likely the best way to go, or to glass it up yourself. I didn't have the tools or experience to do glass, and didn't feel like spending the money to learn. Plus wood is cheap and easy. It seems to be holding up quite well with with about 280watts.

SQ10 Subwoofer Volume Requirements:
Sealed (small) = .25 cu.ft.
Sealed (ideal) = .3 cu.ft.
Sealed (large) = .5 cu.ft.

http://www.edesignaudio.com/product_...roducts_id=106
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Old 02-01-2010, 11:39 AM   #8
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Old 02-01-2010, 10:17 PM   #9
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Good stuff, thanks for the contribution.
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Old 02-02-2010, 09:10 AM   #10
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Hi!

Even when I was making my own spare tire enclosures good quality fiberglass costs more than MDF....so yeah it is more. I just bought this one because it is cold as a hell here and I don't feel like freezing my ass off to make one right now.

FWIW, based on some quick math the -3db down of your box should be about 62 hz. Not too shabby for such a shallow mount woofer. Combine that with a bit of stuffing and the cabin gain and it should sound lovely.

You may want to buy some ratcheting straps and anchor that thing in there. You don't want it becoming a projectile in the event of a crash. I understand you think it is heavy and not going anywhere....get back to me after a major crash.
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Old 02-02-2010, 12:22 PM   #11
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Couldn't you use a flat 45 degree router bit on the 90 degree corners to gain some more volume without sacrificing strength?
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Old 02-02-2010, 12:25 PM   #12
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Quote:
Originally Posted by FunkRider View Post
Couldn't you use a flat 45 degree router bit on the 90 degree corners to gain some more volume without sacrificing strength?
now that's a great idea and cheap / easy to do....hmmmmm
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Old 02-02-2010, 07:02 PM   #13
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Quote:
Originally Posted by FunkRider View Post
Couldn't you use a flat 45 degree router bit on the 90 degree corners to gain some more volume without sacrificing strength?
I don't think he's after more volume. According to the volume requirements he posted for his particular sub he's doing pretty well the way it is.

If he were using a sub that required more volume that would be a good idea though.
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Old 02-03-2010, 07:17 AM   #14
azer408
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I wonder if this will work in my GC
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Old 02-03-2010, 07:33 AM   #15
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That looks really sweet, but where do you keep the spare tire??
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Old 02-03-2010, 09:30 AM   #16
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Quote:
Originally Posted by scoobynewbie1 View Post
That looks really sweet, but where do you keep the spare tire??
READ, the spare tire is under it
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Old 02-03-2010, 12:57 PM   #17
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Quote:
Originally Posted by azer408 View Post
I wonder if this will work in my GC
Actually, it will work but you will have to end up likely having to make a whole new false floor. Which really isn't all that hard...it just takes some time and effort. Something that is much easier when it isn't snowing and freezing.
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Old 02-05-2010, 02:39 PM   #18
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^^I'm actually working on one but it's only going to be available for 8" woofers
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Old 05-15-2012, 06:38 PM   #19
T_Racer69
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First off, sorry to drudge up an old thread. I love this and can't thank you enough for taking the time to laout the elements to build it.

I have one question that I can't get my head around. It shows the bottom plate, the 3/4" spacer, then the 1/4" mounting plate. It seems that the mounting plate would not have any support and sag in the middle. Is is support to go below the spacer ring or am I missing something?

Thanks again, this is my model now for my wagon.

TRavis
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Old 05-15-2012, 09:57 PM   #20
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Screw and glue the top plate to the mounting plate. You could also glue/screw sound 3/4" spacers between the mounting plate and bottom plate, but don't use too much as this pace is used as part of the enclosure. One or both of these techniques should take the flex out of the mounting plate.

Side note, what woofer do you plan to use?
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Old 05-16-2012, 09:56 AM   #21
T_Racer69
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Ahh, that makes sense. I was looking at the SQ10, but they are backordered 90-120 days. I may just go ahead and order it, and use the time to save for the amps and such.

Travis
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