How do you find the cubic ft. in an odd shape? - Car Audio | DiyMobileAudio.com | Car Stereo Forum

Reply
 
LinkBack Thread Tools Display Modes
Old 04-21-2011   #1
 
DIYMA Novice
Join Date: Dec 2008
Location: Minnesota
Posts: 256

Rep Power: 99 vwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enough


iTrader: (0)



Default How do you find the cubic ft. in an odd shape?

I am planning on building an subwoofer box for my wifes Car but I want to conceal it. It is going in a Saturn Vue under the rear floor by the rear tire. I want to keep the spare tire and Build around it. (there is plenty of room) I want it to go about a quarter of the way around it. What I was planning on doing is making a mold out of Pink Rigid Foam Insulation and then fiberglassing around it. But my question is how do I find out the the cubic ft of the inclousere with it being odd shaped?

Thanks
Justind
vwguy383 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 04-21-2011   #2
DIYMA 500 Club
 
SoundJunkie's Avatar
 
DIYMA Regular
Join Date: Dec 2008
Location: Houston, TX
Age: 46
Posts: 782

Rep Power: 107 SoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura about

Send a message via Yahoo to SoundJunkie

iTrader: (67)



Default

Mock up your mold, fill it with styrofoam peanuts then empty the peanuts into a known enclosure volume to check it. Not scientific by any means but gets you close.

Sent from my DROIDX using Tapatalk

2013 Kia Optima Hybrid - Pioneer ODR, Mosconi Steg Illusion Audio Gladen Aerospace Focal Blackhole
2013 USACi Super Modified Q Champion
2011 USACi Modified Q Champion
Team ORCA Team Audionutz
SoundJunkie is offline   Reply With Quote Quick reply to this message
Old 04-21-2011   #3
DIYMA 500 Club
 
TrickyRicky's Avatar
 
DIYMA Loyalist
Join Date: Apr 2009
Location: Somewhere in TX
Posts: 3,491


Rep Power: 138 TrickyRicky is a splendid one to beholdTrickyRicky is a splendid one to beholdTrickyRicky is a splendid one to beholdTrickyRicky is a splendid one to beholdTrickyRicky is a splendid one to beholdTrickyRicky is a splendid one to beholdTrickyRicky is a splendid one to beholdTrickyRicky is a splendid one to beholdTrickyRicky is a splendid one to beholdTrickyRicky is a splendid one to beholdTrickyRicky is a splendid one to behold


iTrader: (44)



Default Re: How do you find the cubic ft. in an odd shape?

Using formulas from middle school, lol. They have formulas to find volume for any shape (circles, spheres, cylinders, squares, triangles, ect). Atleast this way all you need is measurements and a calculator. Plus if you have measurements already you wont have to lift your rear from the seat, and do it from your desk, lol.

We are caged by our cultural programming. Culture is a mass hallucination, and when you step outside the mass hallucination you see it for what its worth. -Terence McKenna.
TrickyRicky is offline   Reply With Quote Quick reply to this message
Old 04-21-2011   #4
 
DIYMA freshman
Join Date: Apr 2011
Location: CT
Posts: 14

Rep Power: 0 MIK3CT will become famous soon enoughMIK3CT will become famous soon enoughMIK3CT will become famous soon enoughMIK3CT will become famous soon enoughMIK3CT will become famous soon enoughMIK3CT will become famous soon enough


iTrader: (0)



Default Re: How do you find the cubic ft. in an odd shape?

Quote:
Originally Posted by vwguy383 View Post
I am planning on building an subwoofer box for my wifes Car but I want to conceal it. It is going in a Saturn Vue under the rear floor by the rear tire. I want to keep the spare tire and Build around it. (there is plenty of room) I want it to go about a quarter of the way around it. What I was planning on doing is making a mold out of Pink Rigid Foam Insulation and then fiberglassing around it. But my question is how do I find out the the cubic ft of the inclousere with it being odd shaped?

Thanks
Justind
Check out this link:
Subwoofer Enclosure Calculators, Fraction to Decimal, Parallel, Series, Port Length and Volume Calculators
MIK3CT is offline   Reply With Quote Quick reply to this message
Old 04-21-2011   #5
 
DIYMA Novice
Join Date: Apr 2009
Location: uk
Posts: 330

Rep Power: 96 yuri will become famous soon enoughyuri will become famous soon enoughyuri will become famous soon enoughyuri will become famous soon enoughyuri will become famous soon enoughyuri will become famous soon enoughyuri will become famous soon enough


iTrader: (2)



Default Re: How do you find the cubic ft. in an odd shape?

Quote:
Originally Posted by vwguy383 View Post
I am planning on building an subwoofer box for my wifes Car but I want to conceal it. It is going in a Saturn Vue under the rear floor by the rear tire. I want to keep the spare tire and Build around it. (there is plenty of room) I want it to go about a quarter of the way around it. What I was planning on doing is making a mold out of Pink Rigid Foam Insulation and then fiberglassing around it. But my question is how do I find out the the cubic ft of the inclousere with it being odd shaped?

Thanks
Justind
fill it with water , 1 Imperial pint = 0.0200679649 cubic feet
its a great way to check if it leaks as well ........

yuri is offline   Reply With Quote Quick reply to this message
Old 04-21-2011   #6
 
DIYMA Novice
Join Date: Dec 2008
Location: Minnesota
Posts: 256

Rep Power: 99 vwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enough


iTrader: (0)



Default Re: How do you find the cubic ft. in an odd shape?

I have heard about the packing peanuts idea. The shape of the box is going to be L shaped with a rounded part that will be by the tire. The other question I had was how do I mount a subwoofer to it? Do I need to put a round piece of wood in it so I can screw the sub too it or will the fiberglass be enough? Also will it effect the sound if I down fire it with a rectangle shaped port out the side? kind of like the some of the JL stealth boxs that go under truck seats?

Thanks
Justind
vwguy383 is offline   Reply With Quote Quick reply to this message
Old 04-21-2011   #7
DIYMA 500 Club
 
t3sn4f2's Avatar
 
DIYMA Addict
Join Date: Jan 2007
Location: Miami, FL
Age: 40
Posts: 8,310

Rep Power: 214 t3sn4f2 is a name known to allt3sn4f2 is a name known to allt3sn4f2 is a name known to allt3sn4f2 is a name known to allt3sn4f2 is a name known to allt3sn4f2 is a name known to allt3sn4f2 is a name known to allt3sn4f2 is a name known to allt3sn4f2 is a name known to allt3sn4f2 is a name known to allt3sn4f2 is a name known to all


iTrader: (0)



Default Re: How do you find the cubic ft. in an odd shape?

I would not use water as a medium to determine volume. Say you have a leak around the MDF baffle that will likely be used. It is now not only a leak but also a swollen ruined area on the box.
t3sn4f2 is offline   Reply With Quote Quick reply to this message
Old 04-21-2011   #8
DIYMA 500 Club
 
DIYMA Addict
Join Date: Mar 2006
Location: NJ
Posts: 5,035

Rep Power: 183 tyroneshoes has a spectacular aura abouttyroneshoes has a spectacular aura abouttyroneshoes has a spectacular aura abouttyroneshoes has a spectacular aura abouttyroneshoes has a spectacular aura abouttyroneshoes has a spectacular aura abouttyroneshoes has a spectacular aura abouttyroneshoes has a spectacular aura abouttyroneshoes has a spectacular aura abouttyroneshoes has a spectacular aura about


iTrader: (81)



Default Re: How do you find the cubic ft. in an odd shape?

Sand is the best and most accurate way.

Alpine INE-S920HD - Audiocontrol Matrix - Kenwood X4R - Kenwood X1R - ESB KT6.28 - ESB Ottomila 16 - Boston G5 10" @32
tyroneshoes is offline   Reply With Quote Quick reply to this message
Old 04-21-2011   #9
 
DIYMA Novice
Join Date: Dec 2010
Location: virginia beach
Posts: 356

Rep Power: 76 9mmmac will become famous soon enough9mmmac will become famous soon enough9mmmac will become famous soon enough9mmmac will become famous soon enough9mmmac will become famous soon enough9mmmac will become famous soon enough9mmmac will become famous soon enough


iTrader: (1)



Default Re: How do you find the cubic ft. in an odd shape?

Mock it up as best you can using a giant cardboard template. Then, if you have to, carve it back up into geometric shapes you can find the volume of. Somebody else had the excellent idea of using plain popcorn in place of the packing peanuts.
9mmmac is offline   Reply With Quote Quick reply to this message
Old 04-21-2011   #10
DIYMA 500 Club
 
SoundJunkie's Avatar
 
DIYMA Regular
Join Date: Dec 2008
Location: Houston, TX
Age: 46
Posts: 782

Rep Power: 107 SoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura aboutSoundJunkie has a spectacular aura about

Send a message via Yahoo to SoundJunkie

iTrader: (67)



Default

Quote:
Originally Posted by vwguy383 View Post
I have heard about the packing peanuts idea. The shape of the box is going to be L shaped with a rounded part that will be by the tire. The other question I had was how do I mount a subwoofer to it? Do I need to put a round piece of wood in it so I can screw the sub too it or will the fiberglass be enough? Also will it effect the sound if I down fire it with a rectangle shaped port out the side? kind of like the some of the JL stealth boxs that go under truck seats?

Thanks
Justind
The enclosure needs to be as rigid as possible to resist flexing and you need a solid, flush mounting surface. Dependent upon the physical weight of the driver and its excursion capabilities you should start with a minimum of 1/2" MDF; the thicker the better. Up or down firing you will have to play with together with phasing to see which works best in your vehicle.

Hope that helps.

Sent from my DROIDX using Tapatalk

2013 Kia Optima Hybrid - Pioneer ODR, Mosconi Steg Illusion Audio Gladen Aerospace Focal Blackhole
2013 USACi Super Modified Q Champion
2011 USACi Modified Q Champion
Team ORCA Team Audionutz
SoundJunkie is offline   Reply With Quote Quick reply to this message
Old 04-21-2011   #11
DIYMA 500 Club
 
nineball's Avatar
 
DIYMA Loyalist
Join Date: Jan 2008
Location: home
Posts: 2,768

Rep Power: 139 nineball is a jewel in the roughnineball is a jewel in the roughnineball is a jewel in the roughnineball is a jewel in the roughnineball is a jewel in the roughnineball is a jewel in the roughnineball is a jewel in the roughnineball is a jewel in the roughnineball is a jewel in the roughnineball is a jewel in the roughnineball is a jewel in the rough


iTrader: (45)



Default Re: How do you find the cubic ft. in an odd shape?

build the enclosure and then use the packing peanuts. if you have too much airspace then fill some in with expanding foam or blocks of 2x4. if you have too little use polyfill.

Freedom of speech includes the freedom to offend people. - Brad Thor
nineball is offline   Reply With Quote Quick reply to this message
Old 04-21-2011   #12
 
DIYMA Novice
Join Date: Apr 2009
Location: uk
Posts: 330

Rep Power: 96 yuri will become famous soon enoughyuri will become famous soon enoughyuri will become famous soon enoughyuri will become famous soon enoughyuri will become famous soon enoughyuri will become famous soon enoughyuri will become famous soon enough


iTrader: (2)



Default Re: How do you find the cubic ft. in an odd shape?

Quote:
Originally Posted by t3sn4f2 View Post
I would not use water as a medium to determine volume. Say you have a leak around the MDF baffle that will likely be used. It is now not only a leak but also a swollen ruined area on the box.
the op said he was making it with ridge foam and fiberglass .. but even if uses an mdf baffle ,its easy to coat it with some resin to prevent water penetrating into the mdf .
sand ,peanuts etc wont find small leaks

yuri is offline   Reply With Quote Quick reply to this message
Old 04-21-2011   #13
 
DIYMA Novice
Join Date: Dec 2008
Location: Minnesota
Posts: 256

Rep Power: 99 vwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enough


iTrader: (0)



Default Re: How do you find the cubic ft. in an odd shape?

Thanks guys for all of the info!! There have been some great ideas. If anyone else has any more ideas bring it on!

Thanks
Justind
vwguy383 is offline   Reply With Quote Quick reply to this message
Old 04-21-2011   #14
 
DIYMA freshman
Join Date: Jul 2008
Location: Canada
Posts: 74

Rep Power: 101 JasonB will become famous soon enoughJasonB will become famous soon enoughJasonB will become famous soon enoughJasonB will become famous soon enoughJasonB will become famous soon enoughJasonB will become famous soon enough


iTrader: (0)



Default Re: How do you find the cubic ft. in an odd shape?

The standard polyester resin used for fiberglass will dissolve styrofoam almost instantly, not sure if this applies to the pink styrofoam as well but you might want to keep that in mind.

Jason
JasonB is offline   Reply With Quote Quick reply to this message
Old 04-21-2011   #15
 
DIYMA Novice
Join Date: Dec 2008
Location: Minnesota
Posts: 256

Rep Power: 99 vwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enoughvwguy383 will become famous soon enough


iTrader: (0)



Default Re: How do you find the cubic ft. in an odd shape?

I thought you could use some type of resin that didn't dissolve it? And then when your finished you can pour I think acetone in the box and it will melt the pink styrofoam? I will have to look into that. My bro in law went to school for an engineering degree in composite materials and I'll have to ask him again about the process.

Thanks
Justind
vwguy383 is offline   Reply With Quote Quick reply to this message
Old 04-21-2011   #16
 
DIYMA freshman
Join Date: Jul 2008
Location: Canada
Posts: 74

Rep Power: 101 JasonB will become famous soon enoughJasonB will become famous soon enoughJasonB will become famous soon enoughJasonB will become famous soon enoughJasonB will become famous soon enoughJasonB will become famous soon enough


iTrader: (0)



Default Re: How do you find the cubic ft. in an odd shape?

I believe epoxy resin won't eat styrofoam.
JasonB is offline   Reply With Quote Quick reply to this message
Old 04-22-2011   #17
 
DIYMA Novice
Join Date: Jul 2009
Location: IN
Posts: 393

Rep Power: 92 Brian10962001 will become famous soon enoughBrian10962001 will become famous soon enoughBrian10962001 will become famous soon enoughBrian10962001 will become famous soon enoughBrian10962001 will become famous soon enoughBrian10962001 will become famous soon enough


iTrader: (0)



Default Re: How do you find the cubic ft. in an odd shape?

Peanuts, OR, make it, play it, don't like it, reduce it or stuff it.
Brian10962001 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Car Audio | DiyMobileAudio.com | Car Stereo Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Location
Where you live
First name
Last name
Do you work in the 12 Volt industry?
Do you work in the 12 Volt industry?
Youtube Channel
Enter Your Youtube Username, And It will Be Linked To In Your Posts!
12V Industry - Company Name
Your company name.
12V Industry - Your Position
Your position in your company.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.3

All times are GMT -6. The time now is 12:40 AM.


Powered by vBulletin®
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Powered by vBadvanced CMPS v3.2.3
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.

Ad Management by RedTyger

Home | User CP | Members List | New Posts | ITrader | Faq | Post Spy