Custom Box - Help needed

[rotoryboy]

OK guys, I'm looking at building a box for the S2 that will go where the spare wheel used to be. What I need to know is:

do I have to work out the volume of the box?
do make the box and just fit the sub in?
do I need to make the box, then make a smaller triangulated box behind where the sub will go?
does it matter which direction the sub faces? (into boot or towards roof)
is it better to mount it speaker out? or Magnet out?

Thanks guys

[Bibby]

do I have to work out the volume of the box?

Yes, if you want the sub to sound at its best.

do make the box and just fit the sub in?

As opposed to what m8? Design and build the enclosure specifically for one particular driver, utilising the Thiele/Small parameters for that sub.

do I need to make the box, then make a smaller triangulated box behind where the sub will go?

No. If I was designing/building an enclosure for a spare wheel well I'd go for a fibreglass enclosure with a birch ply baffle.

does it matter which direction the sub faces? (into boot or towards roof)

Characteristics will differ. It depends on what you're trying to achieve.

is it better to mount it speaker out? or Magnet out?

Makes no difference either way.

[Jamo]

1) YES big yes makes a hell of a difference. Must calculate the box size
2) Nope your not some chav ICE'r with his off the shelf box for street bass farts
3) Are you doing excatly the same as Fat Audi 80?
4) It makes a difference, but you'll need to try it in your car to see which you prefer as it's a personal taste thing.
5) You can mount it out (the box has to be made smaller if you do) but unless your doing it for a show or have 2 subs where you can do a push-pull or bandpass box no point really.

What size sub, what make and what model number?

Can pull up the basic figures in Bass Box Pro.

[Fat Audi 80]

see here for some ideas: http://www.s2forum.com/forum/showthread.php?t=8083

And ask me if you have any questions!

cheers,

Steve

[rotoryboy]

I as looking at part MDF and part Glass, then coloured. I've got this to go in it.

[Fat Audi 80]

As already stated, you need to find out the specs for that sub where is recommends the box size. Decide whether you are going for ported or sealed. (ported will drop a little lower than sealed. Sealed will be a little quicker and punchier).

If you are going to make one like mine, then it is basically a box inside a open box / tray. You need to make a normal sub box (that will fit into the space the spare wheel takes up and then add a front face and sides that are approximately the same size as your spare wheel.

Cheers,

Steve.

[Jamo]

That sub would work perfectly in the box that Fat Audi 80 box, same range.

Initial design is suggesting 0.54 cb ft box 15.3 ltrs (thats taking into account sub displacement)

Driver is designed for a sealed or bandpass configuration.

[Bibby]

ported will drop a little lower than sealed

Other way around Steve.

[rotoryboy]

I'm after help working out how to manufacter/build a box to fit like fataudi80's but with the sub angled at about 45 degrees-ish. Here's a crude pic to give you the jist

[Jamo]

It can't be a perfect triangle box, wont get enough volume.

[Jamo]

measure that box out in your boot and see what you think. It's based on 18mm MDF.

[Fat Audi 80]

It very much depends on what standard of finish you are looking for and how neatly you want it to integrate into the boot. It would not be that difficult to build a basic box to fit in there, but you will be left with large gaps either side of the box.

[rotoryboy]

the top will be a triangle but the bit below will be square.

[HPmuirt]

Hi guys,

Is it possible to get enough volume inside the spare wheel, for a decent sub (but not huge), such that the spare wheel could still be carried, with the sub box sitting inside the wheel?

Looking at the pics of Fat Audi 80's install, by changing the inner triangular box to a smaller round box, it would fit....then his very nice ply outer would still act as the wheel cover

I assume this is all ****** and someone has already proved that the volume is too small even for a small sub...but I had to ask.

Cheers n

Si

[Fat Audi 80]

MIGHT get away with it with an 8" sub, but almost definitely not with a 10", although if you moulded the inside of the spare wheel out of fibreglass it might be possible.You will set have the problem of securing the wheel to the car then the box inside the wheel. I don't think it would be pretty or effective....

Cheers,

Steve