Sub Box Design For An R34 Boot

[ob1]

Ive just built a sub box for my R34 today and thought i'd share the design. I wanted a couple of things out of this box:

- be a suitable volume for a pair of JL Audio 10W0's

- fit snugly enough in the boot so that it was rigidly in place without tying down or bolting in

- removable

- utilise the awkward boot shape effectively

- not require any modification to the boot area

I measured the boot and came up with the following dimensions:

H1 = 190mm = the distance from the floor carpet to the little rise on the mid shelf on the right hand side

H2 = 210mm = the distance from the rise on the right to the underneath of the wiper motor cover

W = 700mm = the distance between the top of the left strut tower and the big rise on the right of the mid shelf

So the box needs to look something like this (hidden detail not shown):

D = 350mm = arbitrarily chosen to give the desired box volume.

I made a cardboard mock-up to test the fit:

And proceeded to make the box with those dimensions:

The box is ~60ltrs internal, which is just enough volume for those 2 subs in a sealed enclosure. To be sure i didn't lose any volume, i mounted the drivers inverted and stuffed the box with pillow-fill. The amp filled the space on the right side and the fire extinguisher will fit on the left.

If you want to make the same from 16mm MDF, the piece dimensions I used are:

Sides - 350mm(D) x 400mm (H) with a chunk taken out on the bottom/back of 140(D) x 190(H)

Top - 668(W) x 350(D)

Front - 668(W) x 368(D)

Bottom1 - 668(W) x 140(D)

Bottom2 - 668(W) x 210(D)

Back1 - 668(W) x 178(H)

Back2 - 668(W) x 190(H)

When measuring pieces for a box this shape, don't forget:

a) take into account the width of the MDF! (hence the strange piece measurements)

b) make sure the pieces that create the concave back overlap on the inside, so there's solid wood-to-wood on that join.

[Trav33]

Nice work, I like the way you made a cardboard model first, to make sure things fitted. Will do that for my boot install when i get around to it.

[Howie]

Commendable effort, I like the way you shaped it into a L shape to use the most amount of space possible. Does the rear speaker magnets get in your way at all?

[ob1]

Commendable effort, I like the way you shaped it into a L shape to use the most amount of space possible. Does the rear speaker magnets get in your way at all?

the rear speakers are tucked up higher than the wiper motor, so they're not a problem....not that they actually DO anything with a bloody baby seat anchor through their cones!

[Howie]

ha.. yeah my baby seat anchor was through the cone also, slack compliancers LOL.

[DECIM8]

would look awesome if you made a board of mdf to cover the wheel wheel bits and covered it in carpet of vynal .. then will look customish

nice deign btw.. I installed a amp rack in the same design .. Im trying to do a wheel well sub enclosure .. shit im bad at fibreglass

Edited May 13, 2007 by DECIM8

[frx026]

question for decim8.

seeing as you have a alpine and a fusion amp. I'm guessing the alpine rins the front/rears, the fusion nv class the subs.

Have you noticed a large turn on bang through the subs every time the system is powered up?

[ob1]

would look awesome if you made a board of mdf to cover the wheel wheel bits and covered it in carpet of vynal .. then will look customish

the wheel bits? You mean the floor over the spare tyre? There is already the standard floor of carpeted chipboard over the tyre, which is neat enough.

PS: i'm a function-over-form man myself, so anything that's not related to the function of the speakers prolly wont be added.

[Chris Rogers]

looks good sean. wouldnt mind a look at some stage.