how to calculate this design

[pimpnFosgates]

i want something similar to this for my 2 sa12s. theyre runnin off a mbquart 1000.1 right now but i plan on another 100.1. if you could help me calculate, or if theres a fancy box guru that can help me out. 13 wide by 34 long and however tall as you need. thank you. just need help calculating really

[siucsaluki11]

Use trig/geometry and you can do it no problem...you just have to divide that bitch into parts, find the volume of each section, add it all up, and youll have your volume.

Edited July 5, 2012 by siucsaluki11

[Jessica]

Just divide it up into the largest square/rectangle shapes as possible, figure the volume on those. then figure the triangles left over. for the triangles it's (base X height) / 2 then X width for area.then add triangle volume and the other one from the squares

edit.

dont forget to subtract the port.

Edited July 5, 2012 by strangeduck

[LZTYBRN]

Okay here's how you can calculate volume in sketchup:

Here's the box with the side off. I basically just used random dimensions for height.

Now, delete the port so you're left with just the back wall. Select the back wall. Right click on it and go to area > selection. Now, the area may be given in square inches or square feet. If it's given in square feet, then multiply by 144 to get square inches. Let's say you were given 4.8 square feet. Multiplying by 144 gives you 691.2 square inches. Record this number.

Measure the inside width of the box. If you're using 13" as the width, then it'll be 11.5". Record this number

Now just multiply the two numbers you recorded. So in our example, you have 691.2*11.5=7948.8. This is your area in cubic inches. Divide by 1728 to get cubic feet (in our case, you get 4.6). This is your GROSS volume. You can plug this in to torres, and then plug your port dimensions and woofer/bracing displacement, and it'll calculate the rest for you. Hope this helps.

Edited July 7, 2012 by LZTYBRN

[siucsaluki11]

i find its easier to just tell them multiply your area by the hight, then divide by 1728 (12^3)

[LZTYBRN]

i find its easier to just tell them multiply your area by the hight, then divide by 1728 (12^3)

What do you mean "tell them" to multiply your area by height?

[Jessica]

i find its easier to just tell them multiply your area by the hight, then divide by 1728 (12^3)

LOL, that only works on uniform boxes dork mcgee, This is an irreglular box, so short of dunking it in water ala "Archimedes" you have to either use a tool like sketchup or break it down.

[siucsaluki11]

i find its easier to just tell them multiply your area by the hight, then divide by 1728 (12^3)

What do you mean "tell them" to multiply your area by height?

take the area of the base (or in this case the side) and multiply it by the height (width in this case) in inches, save the conversion to cuft at the very end, till then, its easiest to keep it all in inches....

i find its easier to just tell them multiply your area by the hight, then divide by 1728 (12^3)

LOL, that only works on uniform boxes dork mcgee, This is an irreglular box, so short of dunking it in water ala "Archimedes" you have to either use a tool like sketchup or break it down.

ummm, yeah, since his box is the way it is, you can take the area of one of the sides, multiply it by the depth of the box (in inches) then divide it by 1728in, which is 12inx12inx12in to convert it to feet. If youre talking about boxes with different depths on the top and bottom, measure a side and the same rules apply smartass.

You can use sketchup to get the area of the side, or you can not be a lazy fuck like you probably are, grab a fucking paper and pencil and a ruler, and do some math to figure it out. But apparently youre too fucking lazy. Doing what you said wouldnt work anyway, it would give the Gross Volume, not even taking the thickness of the wood into account in this situation.

You can ALWAYS use math (trig/geometry in this case) to do this kinda stuff....

Also, my method is the SAME as the guy who also posted, but i convert to cuft at the end, i leave everything in inches till then.

Edited July 5, 2012 by siucsaluki11

[Jessica]

i find its easier to just tell them multiply your area by the hight, then divide by 1728 (12^3)

What do you mean "tell them" to multiply your area by height?

take the area of the base (or in this case the side) and multiply it by the height (width in this case) in inches, save the conversion to cuft at the very end, till then, its easiest to keep it all in inches....

i find its easier to just tell them multiply your area by the hight, then divide by 1728 (12^3)

LOL, that only works on uniform boxes dork mcgee, This is an irreglular box, so short of dunking it in water ala "Archimedes" you have to either use a tool like sketchup or break it down.

ummm, yeah, since his box is the way it is, you can take the area of one of the sides, multiply it by the depth of the box (in inches) then divide it by 1728in, which is 12inx12inx12in to convert it to feet. If youre talking about boxes with different depths on the top and bottom, measure a side and the same rules apply smartass.

You can use sketchup to get the area of the side, or you can not be a lazy fuck like you probably are, grab a fucking paper and pencil and a ruler, and do some math to figure it out. But apparently youre too fucking lazy. Doing what you said wouldnt work anyway, it would give the Gross Volume, not even taking the thickness of the wood into account in this situation.

It is assumed you don't figure the wood thickness into the equation, only internal dimensions. And if you will take notice the box has a 45 degree angle in the middle therefore your method wont work.

edit. I do want to add that yes area X depth will work, but you can't just do "X" x "Y" to get the area of a trapezoid like you make it sound.

Edited July 5, 2012 by strangeduck

[LZTYBRN]

i find its easier to just tell them multiply your area by the hight, then divide by 1728 (12^3)

What do you mean "tell them" to multiply your area by height?

take the area of the base (or in this case the side) and multiply it by the height (width in this case) in inches, save the conversion to cuft at the very end, till then, its easiest to keep it all in inches....

The area is given in square feet, not square inches (at least for me). So keeping it in inches till the end would involve converting to square inches, and then converting to cubic feet at the very end, rather than just converting inches to feet once.

Also, calm the fuck down. There's no reason to calculate it manually, when you have a tool like sketchup, that's just a stupid waste of time. And it works just fine, you're taking the inside volume of the box, no need to take wood thickness into account... Just quit running your mouth, you're making yourself look like an idiot.

Edited July 5, 2012 by LZTYBRN