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Xprime4
06-15-2009, 08:51 AM
A friend asked my for some help with his box design, and i just realize my math skills are long gone. I feel dumber than a 3th grade student

http://i371.photobucket.com/albums/oo152/xprime4/boitemichel.jpg?t=1245070078

don't worry, i never had drawing skill either :rolleyes:

JBL recommand 2.25 ft/cu but the dimension in the pic are more important. The tuning can be anything between 30-34hz. The bottom angle (not the right one) must be 68degre. I just can't calcul anything, would a good samarian help me?

iamamp3pimp
06-15-2009, 09:02 AM
ygpm

Xprime4
06-15-2009, 09:07 AM
Well if i could only know the top sheet dimension (the 68 degree 3th grade calcul), I should be fine with the rest

iamamp3pimp
06-15-2009, 09:54 AM
i got you


2 minutes

thehardknoxlife
06-15-2009, 09:57 AM
3th? Is that a grade in Canada.

iamamp3pimp
06-15-2009, 09:58 AM
http://i35.photobucket.com/albums/d177/iamamp3pimp/Untitled-1.jpg

x1le
06-15-2009, 09:59 AM
3th?

haha you beat me do it. 3th?! Thith?! Thirdth?! who knows...

iamamp3pimp
06-15-2009, 09:59 AM
now thats if the top piece sits on top of the box, with the front screwing into it.

Xprime4
06-15-2009, 10:03 AM
now thats if the top piece sits on top of the box, with the front screwing into it.

thanks a lot good samarian (sp ??? ;) )

3th grade... doesn't exist over here 3rd does

it goes like this
elemental : 1-2-3-4-5-6
Secondary 1-2-3-4-5
College 1-2
University from 3 to 8 years

thehardknoxlife
06-15-2009, 10:06 AM
thanks a lot good samarian (sp ??? ;) )

3th grade... doesn't exist over here 3rd does

it goes like this
elemental : 1-2-3-4-5-6
Secondary 1-2-3-4-5
College 1-2
University from 3 to 8 years Lol, I was joking.....also it's "good Samaritan"

iamamp3pimp
06-15-2009, 10:06 AM
hahahaha 3th

iamamp3pimp
06-15-2009, 10:12 AM
Well if i could only know the top sheet dimension (the 68 degree 3th grade calcul), I should be fine with the rest

not according to you.

:)

Xprime4
06-15-2009, 10:14 AM
hum... mind you telling me how you did that calcul? dimension might change and i want to be a big boy and recalculat by myselft ;)

something to do with sin or cos?

iamamp3pimp
06-15-2009, 10:30 AM
or sketchup....

im no math major either.

thehardknoxlife
06-15-2009, 10:39 AM
or sketchup....

im no math major either.

You might as well just go ahead and do the whole box. I think. It's going to be a pita getting a port with a reasonable amount of area in that box(the 68 degrees makes things a little harder)......if you don't I might.

iamamp3pimp
06-15-2009, 10:49 AM
go ahead

im designing a 4th order for 12 12's

tuomas
06-15-2009, 11:05 AM
thanks a lot good samarian (sp ??? ;) )

3th grade... doesn't exist over here 3rd does

it goes like this
elemental : 1-2-3-4-5-6
Secondary 1-2-3-4-5
College 1-2
University from 3 to 8 years

Elementary

Xprime4
06-15-2009, 11:13 AM
Elementary

:mad:
I'm already trying to use the proper "american" word for your school system. We call the elementary school "école primaire". which can be traducted by primary school

Xprime4
06-15-2009, 11:15 AM
You might as well just go ahead and do the whole box. I think. It's going to be a pita getting a port with a reasonable amount of area in that box(the 68 degrees makes things a little harder)......if you don't I might.

L shaped port would be ok?I just need him to sacrifice more trunk space.

thehardknoxlife
06-15-2009, 11:56 AM
L shaped port would be ok?I just need him to sacrifice more trunk space.

http://i50.photobucket.com/albums/f342/thehardknoxlife/100_2359-1.jpg?t=1245081209

The port is 1 1/2" wide, I forgot that on the picture.

Xprime4
06-15-2009, 12:19 PM
http://i50.photobucket.com/albums/f342/thehardknoxlife/100_2359-1.jpg?t=1245081209

The port is 1 1/2" wide, I forgot that on the picture.

I was just about to say that we can use up to 18 inch for the bottom plate. You read in my mind dude :laugh:

So 12x25 for the top sheet and the port 1 1/2 wide? isn't it a little small?


thanks a lot sir,

Ryan1126
06-15-2009, 12:24 PM
i was going to make a smart *** remark about is grammar/spelling, but then i saw he was from canada so ill cut him slack

anyways, good luck with build dude!

Xprime4
06-15-2009, 12:34 PM
i was going to make a smart *** remark about is grammar/spelling, but then i saw he was from canada so ill cut him slack

anyways, good luck with build dude!

I'm doing my best dude. Btw, i'm not only a retarted canadian... more like a french guy whos trying to talk/write with the X number of english words i know. My sentence might be off sometime, french and english got so little in common.

It seems like i'm being understood anyway, so that's great :laugh:

drpeeb
06-15-2009, 12:35 PM
Is this what you're asking for?

Using your end dimensions, I made this drawing and get this internal end area:

26512063

Multiply the 154.05 internal end area by the internal length of 23.5" (25-0.75-0.75) = 3,620.175 cubic inches or 2.095 cubic feet ... and that's with no volume removed for the port.

Ryan1126
06-15-2009, 12:44 PM
I'm doing my best dude. Btw, i'm not only a retarted canadian... more like a french guy whos trying to talk/write with the X number of english words i know. My sentence might be off sometime, french and english got so little in common.

It seems like i'm being understood anyway, so that's great :laugh:


haha its all good man, you arent doing too bad.

Xprime4
06-15-2009, 12:53 PM
Is this what you're asking for?

Using your end dimensions, I made this drawing and get this internal end area:

26512063

Multiply the 154.05 internal end area by the internal length of 23.5" (25-0.75-0.75) = 3,620.175 cubic inches or 2.095 cubic feet ... and that's with no volume removed for the port.

that was like that... but chance occur ever since. Bottom plate now is 18 deep but thanks man thehardknocklife made some updated plans

drpeeb
06-15-2009, 02:09 PM
that was like that... but chance occur ever since. Bottom plate now is 18 deep but thanks man thehardknocklife made some updated plans

v2:

26512064

Multiply the 181.05 internal end area by the internal length of 23.5" (25-0.75-0.75) = 4,254.675 cubic inches or 2.462 cubic feet ... again with no volume removed for the port.

thehardknoxlife
06-15-2009, 02:51 PM
I was just about to say that we can use up to 18 inch for the bottom plate. You read in my mind dude :laugh:

So 12x25 for the top sheet and the port 1 1/2 wide? isn't it a little small?


thanks a lot sir,
It's 20" of port area. Should be fine for 1 12". If I did it any bigger the box wouldn't fit in the dimensions.

AlterEgo99
06-15-2009, 03:14 PM
I'm doing my best dude. Btw, i'm not only a retarted canadian... more like a french guy whos trying to talk/write with the X number of english words i know. My sentence might be off sometime, french and english got so little in common.

It seems like i'm being understood anyway, so that's great :laugh:

Bien, l'épellation est 'retarded', pas 'retarted'. Mais vous êtes faire grand avec notre anglais! Va-t-il comment mon Français? :D

thehardknoxlife
06-15-2009, 03:24 PM
Bien, l'épellation est 'retarded', pas 'retarted'. Mais vous êtes faire grand avec notre anglais! Va-t-il comment mon Français? :DYep it's "retarded". Seems fine to me....

Xprime4
06-15-2009, 04:36 PM
Bien, l'épellation est 'retarded', pas 'retarted'. Mais vous êtes faire grand avec notre anglais! Va-t-il comment mon Français? :D
:wow:
:laugh: wtf are you talking about. Nothing make sense in the sentence. I just re-read that and the words just don't blend together.

It goes like "But you are do tall with our english"

How does your french feel? real bad :laugh:

AlterEgo99
06-15-2009, 06:16 PM
:wow:
:laugh: wtf are you talking about. Nothing make sense in the sentence. I just re-read that and the words just don't blend together.

It goes like "But you are do tall with our english"

How does your french feel? real bad :laugh:

LOL! :laugh: So much for online English to French translators! :D

AlterEgo99
06-15-2009, 06:17 PM
Yep it's "retarded". Seems fine to me....

I think that is about the only part of that sentence I got right! :D

Blue Fury
06-15-2009, 06:29 PM
Ive taken math at Fresno State for the last 9 semesters.



Im a black belt