Go Back   Home > Forums > Loudspeakers > Full Range

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 26th September 2012, 04:11 PM   #41
diyAudio Member
 
Join Date: Jun 2010
Location: St. Petersburg
Birch plywood is better construction material. In case you can reinforce it with fiberglass do it. Can afford cover entire box by a graphite composite even better.

Aluminum honeycomb panels +graphite composite would be an extreme implementation.

However Sonus Faber favors plain wood and they are making speakers that are very well regarded among audiophiles.
  Reply With Quote
Old 26th September 2012, 04:31 PM   #42
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
otab:
Many of us here have built a few speakers in our time, and I already gave you my best advice - save yourself a $hitload of time and ignore the noisome technical debate of an issue on which there will never be consensus . In less time that it'd take to read all the threads on the subject, you could just build an identical pair with different materials. I did exactly that quite a few years ago now, and while it was revelatory for me, not all who listened to both heard the same things, or reached the same conclusions.


Frankly this is one of those subjects, like "speaker wire" that have become rather fatiguing after over 40yrs, and the pursuit of "technical perfection" that for some folks borders on OCD can too easily distract from the enjoyment of the music..
__________________
you don't really believe everything you think, do you?
community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi
  Reply With Quote
Old 26th September 2012, 04:56 PM   #43
diyAudio Member
 
Join Date: Dec 2005
Location: Plymouth, England
Quote:
Originally Posted by tsiros View Post
plywood is wood, treated to be neutral: alternating wood grain panels. that is why in greek and french it is called "Contreplaqué": it is cross-oriented. MDF isn't wood, it is rough sawdust glued together.

Other than that i have no idea what difference they have in sound. It would be fun to make two twin cabinets using the same amount of money to buy the materials and find out which measures and/or sounds better.
Once built identical cabinets in mdf and 700 density flooring chipboard; the chipboard pair sounded better. Doesn't help with the birch ply question, though. However Russian birch was prettier than Finnish birch, but less dense and wider grain pattern. This was over 30 years ago, mind.
  Reply With Quote
Old 26th September 2012, 05:02 PM   #44
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: British Columbia
Quote:
Originally Posted by chrisb View Post

Frankly this is one of those subjects, like "speaker wire" that have become rather fatiguing after over 40yrs, and the pursuit of "technical perfection" that for some folks borders on OCD can too easily distract from the enjoyment of the music..
More 'Best Advice'
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 26th September 2012, 05:27 PM   #45
diyAudio Member
 
Join Date: Jan 2004
Location: dark side of the moon
I build with MDF for my speakers, always have, always will, I put on my fancy dust mask, turn on the vacuum and plow away. Not that BBP is bad, its just MDF is my preference (ie. I'm cheap). If you build using one material or the other and dont build identical to compare, who cares. You will never know what the other sounds like so what you built will sound awsome. Just MY 2 cents worth.
  Reply With Quote
Old 26th September 2012, 05:41 PM   #46
diyAudio Member
 
Join Date: Aug 2011
You need to use a mask whatever you machine and I repeat most hardwoods are toxic. Lung and nasal cancer were common among woodworkers who were exposed to fine dust. It is strange how emotive this prosaic subject (MDF vs BBP) is to people, it's like religion.
  Reply With Quote
Old 26th September 2012, 05:49 PM   #47
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
Bamboo! I love Bamboo! (Emotive enough?)
  Reply With Quote
Old 26th September 2012, 06:20 PM   #48
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Quote:
Originally Posted by Pano View Post
Bamboo! I love Bamboo! (Emotive enough?)

ah yes - preach to the choir brother

But at well over $200 per sheet, and the cost of tooling to work it cleanly, the better grades of ply are beyond a lot of folk's comfort zone.

And to be only slightly alarmist, dust is only part of the issues with most wood products, solid or otherwise - especially in the case of engineered MDF/PB or plywoods still fabricated with UF glues. These can off-gas for a lot longer than the time it takes to fabricate them, and a simple NIOSH N95 particulate mask won't protect from those or solvent based adhesive & finishing product vapors. Of course the irony here is that between coffee and lunch breaks, over half the guys in our shop (and no doubt in a lot of other trades that worry themselves sick over such issues) smoke at least 1/2 pack a day.
__________________
you don't really believe everything you think, do you?
community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi
  Reply With Quote
Old 26th September 2012, 06:24 PM   #49
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
Well, didn't say it's cheap. But it is beautiful and strong.
Finding good, dense, void free ply isn't always easy.

Of course, I've built speakers out of OSB. That's cheap! In California it comes in thicknesses over 1". Not 'round here, tho.
  Reply With Quote
Old 26th September 2012, 06:39 PM   #50
mp9 is offline mp9  United States
diyAudio Member
 
Join Date: Jun 2006
Quote:
Originally Posted by chrisb View Post
ah yes - preach to the choir brother

But at well over $200 per sheet, and the cost of tooling to work it cleanly, the better grades of ply are beyond a lot of folk's comfort zone.
Sorry for the hijack as i wouldn't contribute much to the discussion since i'd never consider MDF. So, can you tell me more about the tooling (specialty or otherwise), for bamboo ply, iirc it burns thru saw blades fast, how about carbide router bits? If not worth doing for a small monitor i have in mind, i'll stick with BB Plywood.
  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
18mm Baltic Birch vs 15mm Baltic Birch for speakers - stiffness Ultralight Construction Tips 12 23rd June 2011 01:29 PM
source for baltic birch? qingcong Multi-Way 11 4th February 2011 05:52 PM
Super baltic birch Illusus Everything Else 59 17th January 2011 02:44 PM
Stain on Baltic birch flaevor Multi-Way 10 12th November 2006 12:15 AM
Baltic Birch and MDF? downward_dog Subwoofers 6 12th January 2005 11:09 PM


New To Site? Need Help?

All times are GMT. The time now is 08:06 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