Afboy143

06-09-2003, 03:12 PM

Here is a rough pic of the box i made. Sorry its not too good, im not that good with photoshop. This was built using 3/4's mdf btw. THanks guys i really need help

View Full Version : Help me fig. the volume on this box, i need help!

Afboy143

06-09-2003, 03:12 PM

Here is a rough pic of the box i made. Sorry its not too good, im not that good with photoshop. This was built using 3/4's mdf btw. THanks guys i really need help

slipknot87420

06-09-2003, 03:19 PM

2.58

ShaunMac

06-09-2003, 03:53 PM

If the measurements you listed are external.

With 3/4" MDF the box has 1.63cu ft. of air space.

With 3/4" MDF the box has 1.63cu ft. of air space.

Gauntlet

06-09-2003, 03:57 PM

Originally posted by slipknot87420

2.58

Not quite sure how you came to that number....

Assuming the dimensions given are external, break the box into a triangle and a rectangle, and factor out the width of the MDF. Using the pythagorean theorem, the internal dimensions of the triangle are 3.75 x 15.04 x 15.5, and it's 48.5 long. The rectangle is 2.25 x 15.04 and 48.5 long. The squre inches of the triangle are 1367.7, and the rectangle is 1641.24, for a total of 3008.94. Divided by 1728 equals 1.74 cuft.

2.58

Not quite sure how you came to that number....

Assuming the dimensions given are external, break the box into a triangle and a rectangle, and factor out the width of the MDF. Using the pythagorean theorem, the internal dimensions of the triangle are 3.75 x 15.04 x 15.5, and it's 48.5 long. The rectangle is 2.25 x 15.04 and 48.5 long. The squre inches of the triangle are 1367.7, and the rectangle is 1641.24, for a total of 3008.94. Divided by 1728 equals 1.74 cuft.

slipknot87420

06-09-2003, 04:01 PM

Originally posted by Gauntlet

Not quite sure how you came to that number....

Assuming the dimensions given are external, break the box into a triangle and a rectangle, and factor out the width of the MDF. Using the pythagorean theorem, the internal dimensions of the triangle are 3.75 x 15.04 x 15.5, and it's 48.5 long. The rectangle is 2.25 x 15.04 and 48.5 long. The squre inches of the triangle are 1367.7, and the rectangle is 1641.24, for a total of 3008.94. Divided by 1728 equals 1.74 cuft.

ok 7.5+3 divided by 2 = 5.25 ok now 5.25x50x17=4462.5 ok now you divide that by 1728 and that = 2.582

Not quite sure how you came to that number....

Assuming the dimensions given are external, break the box into a triangle and a rectangle, and factor out the width of the MDF. Using the pythagorean theorem, the internal dimensions of the triangle are 3.75 x 15.04 x 15.5, and it's 48.5 long. The rectangle is 2.25 x 15.04 and 48.5 long. The squre inches of the triangle are 1367.7, and the rectangle is 1641.24, for a total of 3008.94. Divided by 1728 equals 1.74 cuft.

ok 7.5+3 divided by 2 = 5.25 ok now 5.25x50x17=4462.5 ok now you divide that by 1728 and that = 2.582

fantomas

06-09-2003, 04:01 PM

i got 1.63 cuft

Gauntlet

06-09-2003, 04:06 PM

Originally posted by slipknot87420

ok 7.5+3 divided by 2 = 5.25 ok now 5.25x50x17=4462.5 ok now you divide that by 1728 and that = 2.582

Why did you add 7.5 and 3 and divide it by 2? And you forgot to factor out the MDF.

ok 7.5+3 divided by 2 = 5.25 ok now 5.25x50x17=4462.5 ok now you divide that by 1728 and that = 2.582

Why did you add 7.5 and 3 and divide it by 2? And you forgot to factor out the MDF.

slipknot87420

06-09-2003, 04:09 PM

Originally posted by Gauntlet

Why did you add 7.5 and 3 and divide it by 2? And you forgot to factor out the MDF.

because how the box is shaped you just take the average from the wall that is slanted adn yeah i know i didnt take out mdf oh well....

Why did you add 7.5 and 3 and divide it by 2? And you forgot to factor out the MDF.

because how the box is shaped you just take the average from the wall that is slanted adn yeah i know i didnt take out mdf oh well....

Gauntlet

06-09-2003, 04:14 PM

Originally posted by slipknot87420

because how the box is shaped you just take the average from the wall that is slanted adn yeah i know i didnt take out mdf oh well....

The average from the wall that is slanted??? You have to break the box up into separate shapes and figure out the volume of each individually

because how the box is shaped you just take the average from the wall that is slanted adn yeah i know i didnt take out mdf oh well....

The average from the wall that is slanted??? You have to break the box up into separate shapes and figure out the volume of each individually

Afboy143

06-09-2003, 04:22 PM

Thanks guys for the help, u all are the best, i really **** at this stuff, so id say around 1.70?

fantomas

06-09-2003, 04:28 PM

Originally posted by Afboy143

Thanks guys for the help, u all are the best, i really **** at this stuff, so id say around 1.70?

about that....and thats BEFORE driver displacement.

Thanks guys for the help, u all are the best, i really **** at this stuff, so id say around 1.70?

about that....and thats BEFORE driver displacement.

slipknot87420

06-09-2003, 04:32 PM

ok you guys were right after wood displacment 1.631

and i was right before wood displacment and yeah that is how how you find the volume of an enclosure like he has:)

and i was right before wood displacment and yeah that is how how you find the volume of an enclosure like he has:)

ShaunMac

06-09-2003, 04:34 PM

Originally posted by Gauntlet

The average from the wall that is slanted??? You have to break the box up into separate shapes and figure out the volume of each individually

Or you can take the average of the top(1.5") and the bottom(6") which is 3.75" internal

Then you can figure up the air space as if it was a rectangle.

3.75" x 15.5" x 48.5" = 2819.06sqin./1728 = 1.631cuft.

The average from the wall that is slanted??? You have to break the box up into separate shapes and figure out the volume of each individually

Or you can take the average of the top(1.5") and the bottom(6") which is 3.75" internal

Then you can figure up the air space as if it was a rectangle.

3.75" x 15.5" x 48.5" = 2819.06sqin./1728 = 1.631cuft.

Afboy143

06-10-2003, 02:27 AM

**** i swear u all are the best, thanks fo everything, this is why i love this forum! so much help. Hmmm How much polyfil should i add to this box cuz its a lil too small?

Gauntlet

06-10-2003, 05:25 PM

Originally posted by Afboy143

**** i swear u all are the best, thanks fo everything, this is why i love this forum! so much help. Hmmm How much polyfil should i add to this box cuz its a lil too small?

16-20 oz per 1 cuft.....so probably around 2 pounds or so...

**** i swear u all are the best, thanks fo everything, this is why i love this forum! so much help. Hmmm How much polyfil should i add to this box cuz its a lil too small?

16-20 oz per 1 cuft.....so probably around 2 pounds or so...