18mm Baltic Birch vs 15mm Baltic Birch for speakers - stiffness - Page 2 - diyAudio
Go Back   Home > Forums > Design & Build > Construction Tips

Construction Tips Construction techniques and tips

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 23rd June 2011, 01:06 AM   #11
diyAudio Member
 
Join Date: Jun 2011
Audio wise, would there be a practical/noticeable advantage with 18mm over 15mm? That's really the crux of my query.

Thanks,
UL
  Reply With Quote
Old 23rd June 2011, 02:00 PM   #12
Loren42 is offline Loren42  United States
diyAudio Member
 
Join Date: Sep 2008
Location: "Space Coast" Florida, USA
Quote:
Originally Posted by Ultralight View Post
Audio wise, would there be a practical/noticeable advantage with 18mm over 15mm? That's really the crux of my query.

Thanks,
UL
There is no way to really know without building both versions in the exact same way and take comprehensive measurements.

There are so many other factors to the equation that it becomes like predicting weather.

Since the quantitative approach is not very practical for the DIY one tends to err on the side of caution and over-engineer things (or at least have an open path to upgrade or correct problems if they arise).

If it were me, I would probably lean toward thicker material so that I can eliminate or reduce one more variable in a system that has so many to begin with.
  Reply With Quote
Old 23rd June 2011, 02:29 PM   #13
diyAudio Member
 
Saturnus's Avatar
 
Join Date: Jun 2005
Location: Copenhagen, Denmark
Quote:
Originally Posted by boywonder View Post
For a given material, the stiffness increases with the cube (3rd power) of the thickness.........for an easy example, take a long 2x4 and place it between two saw horses laying flat, and compare it's stiffness when laying flat to when on edge.....then a 2x6, 2x8, etc.

Your "rules of thumb" are quite close; 18mm cubed is 5832, and 15mm cubed is 3375, and 12mm cubed is 1728. So 5832/3375=1.72 and 3375/1728=1.95 (not quite 2X for either of these, but 1.95 is close). Taking 5832/1728=3.37, so not quite 4X from thinnest to thickest.
I think the roughly doubling holds as the base stiffness per mm is not identical for 18mm/13ply, 15mmm/11ply, and 12mm/9ply.

Btw, if optimum stiff is the most vital aspect which it often is, then consider filmed baltic birch (or really epoxy glued and coated) it has far the greatest base stiffness any non-exotic wood product I know off. It's in many cases also cheaper because the outer coating means that there are no visually aesthetic requirements for this product. The only requirement is maximum stiffness per mm.
  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
source for baltic birch? qingcong Multi-Way 11 4th February 2011 06:52 PM
Super baltic birch Illusus Everything Else 59 17th January 2011 03:44 PM
Stain on Baltic birch flaevor Multi-Way 10 12th November 2006 01:15 AM
working with baltic birch plywood morbo Multi-Way 55 17th September 2005 06:09 PM
Baltic Birch and MDF? downward_dog Subwoofers 6 13th January 2005 12:09 AM


New To Site? Need Help?

All times are GMT. The time now is 01:55 PM.


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