Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 6th April 2004, 10:44 PM   #1
diyAudio Member
 
wigginjs's Avatar
 
Join Date: Dec 2003
Location: Columbia, SC
Default Finding the volume of a driver

I'm designing a new sub for my HT involving a Dayton Titanic MKIII 12" woofer. I'm curious, whats the best way to find the volume of a particular driver? Does the manufacturer ever provide this information? I need to know because I'm going to add this amount, as well as the volume of the port tubes and bracing so I will know the exact dimensions of the enclosure I need to build.
  Reply With Quote
Old 6th April 2004, 11:34 PM   #2
Keld is offline Keld  Sweden
diyAudio Member
 
Keld's Avatar
 
Join Date: Jan 2002
Location: Borås, Sweden, Tellus
this is the answer I got when writning to Peerless asking for the volume of a 12"XLS:
Quote:
" SNIP
We do not have the volumes of the drivers, I think that you mean how much
volume the drivers take in the box?

But in real life, you can count on the following:

1. The driver magnetsystem takes a lot of volume, it can be calculated very
easily as a cylinder.

2. The cone takes some volume also, but you have also cut a hole in the
baffle for the driver? The hole in the baffle makes the volume bigger and
the cone takes some of the volume back. This means if you neglect the hole
in the baffle and neglect the cone, the error you make is small.

This means, calculate the volume of the magnetsystem and neglect the cone.
SNIP

I have even drawn a pic of the cone: volume :http://www.diyaudio.com/forums/showt...255#post109255
__________________
"What is done by what is called myself is, I feel, done by something greater than myself in me."
James Clerk Maxwell. 1879
  Reply With Quote
Old 6th April 2004, 11:46 PM   #3
diyAudio Member
 
moving_electron's Avatar
 
Join Date: Jan 2004
Location: Where the rain does fall but the trees grow tall
Default Re: Finding the volume of a driver

Quote:
Originally posted by m0tion
I'm designing a new sub for my HT involving a Dayton Titanic MKIII 12" woofer. I'm curious, whats the best way to find the volume of a particular driver?
Find a cardboard box that the driver fits in such as the one it shipped in. Calculate the volume of the box from it's dimensions.

Put a plastic bag around the driver and put the driver upsidedown in the box. Pour in rice until the box is full. Measure the volume of the rice. Subtract this from the box volume to get the driver volume. (Small error due to some of the speaker being in the baffel.)
  Reply With Quote
Old 7th April 2004, 12:10 AM   #4
Keld is offline Keld  Sweden
diyAudio Member
 
Keld's Avatar
 
Join Date: Jan 2002
Location: Borås, Sweden, Tellus
Default Re: Re: Finding the volume of a driver

Quote:
Originally posted by moving_electron


Find a cardboard box that the driver fits in such as the one it shipped in. Calculate the volume of the box from it's dimensions.

Put a plastic bag around the driver and put the driver upsidedown in the box. Pour in rice until the box is full. Measure the volume of the rice. Subtract this from the box volume to get the driver volume. (Small error due to some of the speaker being in the baffel.)
the error is the same as the volume of the hole in baffle in the final box.
__________________
"What is done by what is called myself is, I feel, done by something greater than myself in me."
James Clerk Maxwell. 1879
  Reply With Quote
Old 7th April 2004, 01:31 PM   #5
diyAudio Member
 
wigginjs's Avatar
 
Join Date: Dec 2003
Location: Columbia, SC
Damn, I was hoping you guys would know some sort of quick trick =). It seems like this would be information that should be provided by the manufacturer. Thanks for the help.
  Reply With Quote
Old 7th April 2004, 01:46 PM   #6
markp is offline markp  United States
diyAudio Member
 
Join Date: Oct 2003
Location: L.A., CA
Some do post the volume displaced by the driver, not the cone displacement but the volume occupied by the driver.
__________________
If it sounds good... it is good!
  Reply With Quote
Old 7th April 2004, 03:06 PM   #7
diyAudio Member
 
mwmkravchenko's Avatar
 
Join Date: Jan 2002
Location: Perth Canada
Default Try this

Search for a program called the driver parameter calculator DPC I think it has a routine for the calculation of the volume of a driver that is pretty accurate.

http://www.diysubwoofers.org/audiolinks.htm

It's about 2/3rds the way down

Mark
__________________
Mark
  Reply With Quote
Old 7th April 2004, 03:11 PM   #8
diyAudio Member
 
moving_electron's Avatar
 
Join Date: Jan 2004
Location: Where the rain does fall but the trees grow tall
Well, it looks like the fastest way to get a number that is close to the actual volume is to use the suggestion in one of the posts above to calculate the volume by calculating it is a combination of cylinders.

The volume of the cylinder = pi * r * r* h where
pi = 3.14159
r = radius (not diameter!) of the circle that forms the base
h = hieght of the cylinder

Calculate the magnet portion which looks to be pretty much a cylinder.

Calculate the basket portion that will actually be in the subwoofer box when it is mounted. Calculate it as a cylinder and then take off some percent (maybe 35%?) since it really is a more of a cone with a lopped of top shape.

Add the two together and you have a pretty good estimate.
  Reply With Quote
Old 7th April 2004, 10:25 PM   #9
Wizard of Kelts
diyAudio Moderator
 
Join Date: Sep 2001
Location: Connecticut, The Nutmeg State
In this thread, I did a rough estimate of the occupied volume for a Peerless 12" XLS. It came to 2.5 liters.
XLS-Subwoofer question: Two passive radiators instead of one

So call it three liters and you can't be much off.

Unless you get to 10% or so of the entire box volume, there is virtually negligible effect on the response. That rough estimate simply cannot be off by much. In fact, a lot of people get good results just ignoring the volume of the speaker altogether.
__________________
"A friend will help you move. A really good friend will help you move a body."
-Anonymous
  Reply With Quote
Old 7th April 2004, 10:31 PM   #10
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
The answer you got from Peerless is entirely
sensible. Unless you have a 3" thick baffle.

sreten.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Having trouble finding the right volume for my sub box blair99 Subwoofers 1 7th September 2008 12:38 PM
Need help finding a specific driver. Rick J. B. Full Range 0 28th December 2006 11:55 AM
Trouble finding slide volume(Alps) ocool_15 Parts 0 27th March 2006 04:14 PM
Finding the Manufacturer of a driver JMB Multi-Way 6 23rd November 2004 09:51 AM
need driver finding help trespasser_guy Multi-Way 10 18th December 2002 05:40 AM


New To Site? Need Help?

All times are GMT. The time now is 08:04 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2