HELP - working out sub sealed box volume.

[SupraStar 3000]

Started working out the sealed box volume for a Infinity Reference 1030w 10" sub and I'm now a little confused :conf:

The diameter of the sub is 10" (254.0mm) so I'd guess going on past sub boxes i would expect the size to be around 25" cubed
(thats 25"high x 25"deep x 25"wide) approximately.

In the box i find a 'technical date' sheet!
Great, this should confirm the box size but according to the data the sealed box volume (including driver displacement) should be 0.72 ft cubed (21.24 liters)

:eek: ?????? ..... but thats around 9"sq and smaller than the sub diameter.
way too small?

Any ideas.

Thanks,
Ed

[Matt Harwood]

Most speaker manufacturers spec sheets will include the displacement of the driver in their recommended enclosure size. So all you need to do, is build one to that size INTERNALLY.

Take the internal measurements HxWxD (in your example 25x25x25= 15625) then divide that number by 1728, (the number of cubic inches in a cubic foot. So your example would have worked out to 9.04 cu.ft!!! :eek:

H" x W" x D" = Y". - Y" / 1728 = X' cu.

If you have a sloping rear section, mentally cut off the angle and work out the AVERAGE of that section, then add it back on to one of the other figures.
e.g. A box with a sloped rear. Take the angled sectional depth, measures 1" at the top, and 6" at the bottom. 1"+6" / 2 = 3" Add the 3" to the original Depth figure.

Does that make sense?

[SupraStar 3000]

:stupid: wish I had concentrated more in maths at school.

thanks for your formula Matt :thumbs: think I understand it ;)

I need an INTERNAL size of 0.75 cubic foot.
thats 21.24 liters.

(cm) I intend to make my box 37cm x 37cm x 15cm deep.
thats 37 x 37 x 15 = 20.54 liters (+1 liter for sub pod = 21.5lt)

or

(inch's) 15" x 14" x 6" deep
thats 15 x 14 x 6 = 1176 / 1728 is 0.73 cubic foot (+0.02 cubic foot for sub pod = 0.75 cubic foot)

is that all correct? :conf:

[Matt Harwood]

Looks more like it :thumbs: Easy eh? ;)

[SupraStar 3000]

Originally posted by Matt Harwood
Easy eh? ;)

..... yea, nice 'n' easy :looney: LOL

thanks for you help matt.
Appreciate it mate :thumbs:

[SKI]

Bassbox pro will do this, it produces a 3d design that you can build, these can be almost any shape, that's what I used. It even has the speakers and amps built in so you just choose what you have any the programme does the rest... It's excellent. You can even pick the frequency you want and the software matches the box dimensions to your hardware etc to achieve this. You can build ported, bandboxes etc.


If you don't want to buy it... Try DC+ :)

[SupraStar 3000]

Cheers SKI.

Sounds great, but I can't find it on download.com

Any links? ;) :D

[JustGav]

Check out linearteam...

They do a speaker box program for free...

I will try and dig out the URL when I get home..

Gav

[SupraStar 3000]

Cheers Gav.
I have alreay made the box but will find the program helpful in the furture.

Pics attached
Foamboard moc-up (later made in foamx PVC board)
http://www.david.c.c.btinternet.co.uk/Resources/item1.jpeg

18mm MDF 10" sub boxes 3" deep
http://www.david.c.c.btinternet.co.uk/Resources/instal1h.jpeg

Wheel arch recess
http://www.david.c.c.btinternet.co.uk/Resources/instal1g.jpeg

Blanking panel (covers up amp, boxs, wires and multi cd) need holes cut out.
http://www.david.c.c.btinternet.co.uk/Resources/instal1f.jpeg

First coat of body filler.
http://www.david.c.c.btinternet.co.uk/Resources/instal1e.jpeg

Another moc-up pic
http://www.david.c.c.btinternet.co.uk/Resources/instal1d.jpeg

[suprastorm]

looking good

[Trig]

That looks quality mate. got any more pics? And details of how you made the bottom bit? also are you able to take it out?

[SupraStar 3000]

Thanks :thumbs:

Long way to go but the hard bit is done.
I'll take some more pics this weekend. The pods are done and sanded smooth. Just need painting.

The pods are bolted and sealed onto the box (to make them air tight) and the blanking panel fits over the pods and locates onto the box lid. This also covers all the wires, cd changer and amp.

All components are removable so I can access the space saver wheel with minium effort.

Here are the plans:

http://www.david.c.c.btinternet.co.uk/Resources/instal1b.jpeg

http://www.david.c.c.btinternet.co.uk/Resources/instal1.jpeg

http://www.david.c.c.btinternet.co.uk/Resources/instal1a.jpeg

[SupraStar 3000]

Finally finished it:

See thread below:
http://www.mkivsupra.net/vbb/showthread.php?p=387422