Bracing material? - Page 6 - diyAudio
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 15th November 2012, 04:22 PM   #51
diyAudio Member
 
critofur's Avatar
 
Join Date: Jan 2004
Location: Columbus, OH
Send a message via AIM to critofur Send a message via MSN to critofur Send a message via Yahoo to critofur
Quote:
Originally Posted by TestTones View Post
Show pics of any of your ...Meanwhile any guitar or bass cab made out of real wood or even cheap pine ply will sound better than any MDF cab with the same speakers.
Ah ha! A guitar or bass cabinet has a very different set of goals than a home/studio speaker/monitor.

With the guitar speaker it's purpose is not to accurately reproduce a recording whereas that is the purpose of the other speakers.

I suppose with a bass speaker, you may have the issue that you wish to achieve better lf output by having a stiff cabinet.
__________________
Critofur
http://www.ohmspeakers.com <- all the folks here are my friends
  Reply With Quote
Old 15th November 2012, 08:23 PM   #52
diyAudio Member
 
Join Date: Apr 2007
Quote:
Originally Posted by JRKO View Post
Planet10 can put it better than me so its best to quote ''Hign mass is a myth (lots of myths started by marketing departments to help them shrink costs). If you have 2 materials with the same stiffness, the light one is better.
High mass is not a myth. If you want to reduce transmission of sound through a wall, you'll need mass. The more, the better. The problem in speaker design is how to achieve the higher mass. Simply increasing the thickness of the material will make the panel much more stiffer (thickness^3) than heavier, therefor raising both resonance frequency* and Q.

Quote:
MDF is both less stiff and denser [than BB]. A good receipe for energy storage
If it is less stiff it will store less energy.
  Reply With Quote
Old 15th November 2012, 08:33 PM   #53
diyAudio Member
 
mondogenerator's Avatar
 
Join Date: Sep 2009
Location: City Of Villans
Blog Entries: 1
+ 1 million
__________________
Every new piece of knowledge pushes something else out of my brain - Homer.....................Simpson
  Reply With Quote
Old 15th November 2012, 08:47 PM   #54
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally Posted by Baseballbat View Post
therefor raising both resonance frequency* and Q.
A good thing AFAIC

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 15th November 2012, 10:21 PM   #55
diyAudio Member
 
JRKO's Avatar
 
Join Date: Dec 2003
Location: U.K.
Send a message via AIM to JRKO
As I've been reading up on box materials I realise that our posts, mine included, have drifted to the 'MDF vs ply vs blah blah blah for cabinet construction discussion' rather than the original topic of 'bracing material?'

(BTW blah blah blah is vastly superior material to both ply & mdf as is infinitely stiff & infinitely dense. Finding a stockist on the other hand is improbable )

Now back to studio for our scheduled program!!
__________________
In the interests of full disclosure JRKO = James Rupert Kingsley Osborne. And yes, my parents will pay for it when I choose their retirement home
  Reply With Quote
Old 15th November 2012, 10:44 PM   #56
diyAudio Member
 
Join Date: Aug 2012
So how about a horizontal window pane in combination with a vertical window pane that crosses through it creating a cross if viewed from a certain point. This seems like it would be extremely rigid and capture the strength of the ply...
  Reply With Quote
Old 15th November 2012, 10:54 PM   #57
diyAudio Member
 
JRKO's Avatar
 
Join Date: Dec 2003
Location: U.K.
Send a message via AIM to JRKO
do you mean it would look like a cross from the left or right hand sides?

Ideally they should be unevenly spaced otherwise your creating a set of smaller vibrating panels.

As all the movement & energy in a box comes from the driver, bracing the driver against the back panel and ideally the top and bottom with a holey brace is a very good place to start. You could then run dowel braces across the cabinet thru the holes!
__________________
In the interests of full disclosure JRKO = James Rupert Kingsley Osborne. And yes, my parents will pay for it when I choose their retirement home
  Reply With Quote
Old 15th November 2012, 10:57 PM   #58
diyAudio Member
 
Join Date: Aug 2012
Quote:
Originally Posted by JRKO View Post
do you mean it would look like a cross from the left or right hand sides?

Ideally they should be unevenly spaced otherwise your creating a set of smaller vibrating panels.

!
Yes, but it could be offset if necessary. It seems that it would tie in the top and bottom of the cabinet as well and keep the horizontal braces from being floppy.
  Reply With Quote
Old 15th November 2012, 11:02 PM   #59
diyAudio Member
 
Join Date: Nov 2009
Location: Birmingham, UK
Generally it is a good idea to make the bracing from a different material than the cab itself and use a lossy adhesive ie one that does not set solid.

Unevenly spaced is also a good move as JRKO said and to make sure that it is not parallel to the cabinet walls.
  Reply With Quote
Old 15th November 2012, 11:03 PM   #60
diyAudio Member
 
JRKO's Avatar
 
Join Date: Dec 2003
Location: U.K.
Send a message via AIM to JRKO
the cabinet is vibrating because of the driver. No driver, no vibrations, no need to brace.

Sink the vibrations direct from the driver into several panels and the energy is shared/divided amongst them. You reduce the amount of energy that gets channeled into the faceplate (which is the most susceptible as it holds the driver) which in turn vibrates and distorts the drivers output further.

Dump that energy in the most efficient way you can and the panels require less bracing
__________________
In the interests of full disclosure JRKO = James Rupert Kingsley Osborne. And yes, my parents will pay for it when I choose their retirement home

Last edited by JRKO; 15th November 2012 at 11:06 PM.
  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
Bracing Howard Subwoofers 3 28th March 2012 01:55 PM
Transformer potting material? what material? rvrazvan Tubes / Valves 38 10th October 2011 05:02 PM
How much bracing is necessary? Frosteh Subwoofers 91 27th September 2011 11:59 PM
Enough bracing? Vikash Multi-Way 51 8th May 2006 05:58 PM
how much bracing is enough gwgjr31 Subwoofers 1 5th May 2006 06:57 AM


New To Site? Need Help?

All times are GMT. The time now is 05:52 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