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New Member + Calculating Box Volume

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ColinP View Drop Down
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Joined: 13 April 2021
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    Posted: 13 April 2021 at 5:13pm
Hello there! I'm Colin, and just signed up to the forum.

I've just recently come across this forum that seems to be packed full of awesome info and helpful guides on building speakers, can't wait to get stuck in and learn new stuff from you guys.

Im not a pro on any level but I love working with wood and a hobbyist when it comes to audio. so I thought of giving it ago at designing my own little cab.

My first Hurdle is, calculating the volume of a box. I plan to build a small simple 6 sided symmetrical cab to seat a B&C 8CXN51 (500w) coaxial driver I have laying around. Because this is my first time designing a box i've been trying to learn how to calculate box volume for the size of the driver so I can get my final cutting dimensions, I can't seem to find how to calculate a 6 sided cab with different size sides on the net as there all just simple 4 sided cubes on each link I click on.

if anyone has any links to something better than what i've found it would be appreciated! Unless someone already has the knowledge to pass on. Or even an online tool for the job (which i've search and failed LOL)

Any help on this would be greatly appreciated!

Thanks, Colin.


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DMorison View Drop Down
Young Croc
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Joined: 14 March 2007
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 13 April 2021 at 8:53pm
Hi, and welcome!

If you mean 6 sides plus top and bottom, then you need to calculate the area of the hexagon created by those 6 sides, then multiply that by the height.

If it's a regular hexagon, this should work:
 

If it's an irregular hexagon, you might need to split it up into parts, eg this could be one rectangle plus 2 triangles: 

The area of this would be AxB for the central rectangle plus 0.5xBxC for each of the side triangles, which simplifies to BxC for both of them combined.

Remember also, if you're working from a suggested design either from a datasheet or modelling program, the volume it gives you is always the NET volume, after accounting for any inclusions within the space.
What that means is that the volume of the backside of the driver(s) themselves, handles, braces, HF horns, ports etc etc all need calculated up and added to the number from the design before you then calculate your panel sizes.

HTH,
David.


Edited by DMorison - 13 April 2021 at 8:54pm
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DMorison View Drop Down
Young Croc
Young Croc


Joined: 14 March 2007
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 13 April 2021 at 8:56pm
PS, if you want an online tool, you're outta luck - Donald Trump got banned from social media.

But seriously, the search term you'd want is "volume of a hexagonal prism".


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ColinP View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ColinP Quote  Post ReplyReply Direct Link To This Post Posted: 14 April 2021 at 6:31pm
Hi David

Thanks for that, thats gave me more of an idea now. Also found some more info to read online now I know what i'm looking for..

hopefully i've figured out how to post photos haha... below is a sketch I dragged off the internet of a 6 sided box, that is the design id like to build my self, just to give more of an idea in visual.


I've just downloaded winisp also so im currently in the middle of learning that programme... sure ill have plenty more questions in the near future but I believe ill be able to find most answers from the post on this forum.

Cheers
Colin
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DMorison View Drop Down
Young Croc
Young Croc


Joined: 14 March 2007
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 15 April 2021 at 1:44pm
Cool, so for that shape, I'd take the total area of the rectangle defined by the width and depth, then subtract each of the 2 triangles formed by the corners, easy enough.
Cheers,
D.
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