Building a Box

[AznVirus]

ill get the specs of my trunk back to you when i get the car back, but just wondering, does it really matter? cause i want to put the subs into my future G20. will i have to make a new box for that car? thanks for all the help so far, youve been a great help

[P11GT]

I think the box will be fairly small anyway, so if it'll fit into the 200sx, it should go into the G20 no problem, dont worry about it. When ive designed it, i'll give you an overall size, so you can judge for yourself.

There are however, serveral tools, you'll need. This is what i have and would use.

Wood saw
Cordless drill/screw driver
Sander, flat bed or orbital
Jigsaw
and if possible, a power plainer.

The power plainer helps you get the correct angles when joining the sloping side to the box.

and dont forget a good pencil, ruler and tape measure.

[AznVirus]

Originally posted by P11GT
I think the box will be fairly small anyway, so if it'll fit into the 200sx, it should go into the G20 no problem, dont worry about it. When ive designed it, i'll give you an overall size, so you can judge for yourself.

There are however, serveral tools, you'll need. This is what i have and would use.

Wood saw
Cordless drill/screw driver
Sander, flat bed or orbital
Jigsaw
and if possible, a power plainer.

The power plainer helps you get the correct angles when joining the sloping side to the box.

and dont forget a good pencil, ruler and tape measure.

i have a wood saw, drill (not cordless though), jigsaw, and what is a power plainer?

[P11GT]

A plainer is used to take thin slices of wood off, similar to what a shaver does, so a power plainer is just mains powered and therefore easier to use.

[P11GT]

heres another

[P11GT]

so i this picture, the guys putting an angle on the edge of the wood, this is what you'll need to do for some parts of the box, so find or lend a tool to do what he's doing.

[AznVirus]

i will need the sander for smoothening out the edges right? i dont have a sander, but i can sand by hand.

[P11GT]

yeah, sure thing, you'll need several grades though, from rough to smooth. Help you build up your forearms.

[AznVirus]

Thiele/Small Parameters
Fs 26.6 Hz
Qts 0.43
Vas 1.75 ft.
Xmax 0.17 in.
Recommended enclosure size 0.7 ft. sealed

for the specifications, what does all of them mean? Fs, Qts, Vas, Xmax. and for the recommended enclosure size, do they mean the entire volume of the box? thats damn small.

[P11GT]

To be honest, i dont know what all that means, the only figures you need be concerned with are:

sensitivity, it could be 89% or 90% or 91%, this gives you the efficiency of the sub, the higher the value the better.

power handling, Watts RMS/Max but then again, you cant always rely on Maximum value cos some manufacturers do state false values.

and Xmax, which is the ammount of excursion of the woofer, giving an idea of how much it moves. Note, the more it moves, the more power required to drive it, generally speaking.

If you look beyond these values, then thats when you cross into Pro Competition equipment, where subs will cost a hell of a lot more than most people would spend, and the sound produced would be used for competitions and sound different to your everyday listening habbits.

I just need the boot sizes and the displacement when you get them, and thats all i need. With a little help using my maths skills, i can calculate the exact box size, then break down the volume into areas which will give me the sizes of each panel of wood used to put it together. Its simple when you know how, but this is something ive learnt over the space of 5 years building boxes for myself, friends and clients.

[AznVirus]

i have the spec of my trunk, here they are...

available height between trunk floor and parcel speaker = 18 inches

distance between seat and speaker = 12 inches

available width clearing struts and hindges = 40 inches

[P11GT]

do you want me to go ahead and design the box with an estimated value for displacement or wait till you get the proper value?? I can take an average displacement of a ten inch and use that. I think there will be very little in it, and there'll be no difference in quality.

[AznVirus]

hm, let me wait until i get the subs, probably a week or so. not too long

[P11GT]

ok, i'll start to draw up some diagrams, ready for the measurement figures, this should save some time.

[P11GT]

Here you go Aznvirus, the first part of your box.