Solid oak speakers??? - 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 16th October 2007, 05:51 AM   #1
tman204 is offline tman204  United States
diyAudio Member
 
Join Date: Oct 2007
Default Solid oak speakers???

Hi all!

I'm new to this group, but I hope you can give me some pointers for my next build.

I am building a set of "furniture grade" speakers for my Father-in-law. I have settled on a Vifa 6.5" P17WJ-00 coupled with a Dayton RS28AS-4 in a 2way design. From the simple tools I have used, this should make a nice match crossed at 3.2khz, but here's the question:

I am going to use solid red oak (not veneered) for the speaker construction. The oak is 1" thick. Dimensions will be 16 x 10 x 6.25. Is there anything special I need to consider when using this material? This will be the first build using red oak; all my others have been 3/4" MDF with really good results IMHO. I typically wouldn't go to this expense of using solid oak, but, the wife wants these to "mean something" and the father-in-laws house is all trimmed in red oak. Not to mention his current speakers are Advents from 1973 - so I expect he'll keep them a while.

Any thoughts / comments before I begin my build this weekend?

Thanks much!
  Reply With Quote
Old 16th October 2007, 06:35 AM   #2
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
It takes a lot of experience and VERY stable wood to successfully build a box out of solid, there a lot of gotchas... if you don't absolutely know what you are doing, it is likely to end up being a disaster.

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 16th October 2007, 11:31 AM   #3
Foxx510 is offline Foxx510  Australia
diyAudio Member
 
Join Date: Nov 2006
Some hardwoods can be very resonant, so perhaps make them a little larger to allow for some extra damping materials inside. Your other option is MDF with a nice veneer, which would probably be sonically much better and you won't have the risk of cracking which is a very real possibility with hardwoods.
  Reply With Quote
Old 16th October 2007, 12:48 PM   #4
diyAudio Member
 
Join Date: Oct 2006
I've been seriously into woodworking for over 15 years. This is the only place I hear people talking about solid wood cracking. Building boxes or anything else out of hardwood should not cause cracking. I have seen one example of a speaker that cracked. While I don't know the details I'm sure that it is easily explained.

Outside of the DIY speaker builders, I have not heard of other wood workers that have their project crack because they use solid wood. FWIW, my father has been woodworking for 40 years, my grandpa about the same, and I am involved in a wood workers association, so I am exposed to many different projects and designs.

What I can't understand is why everyone in speaker building thinks a box made of solid wood will always crack.

My only advice in using red oak is that you need to be careful with the joints. Unlike mdf, you don't get to "cover up" any of your mistakes with veneer or paint.
  Reply With Quote
Old 16th October 2007, 01:43 PM   #5
Account disabled at member's request
 
MJL21193's Avatar
 
Join Date: Mar 2007
Quote:
Originally posted by s7horton

What I can't understand is why everyone in speaker building thinks a box made of solid wood will always crack.

Hi,
It's not that it will crack, it's that it may crack.
Being a serious woodworker, you have no doubt heard of cross-grain gluing? Furniture projects generally don't need to be sealed, leak proof boxes.

Another point- as solid wood wil expand and contract due to moisture level, it can place a lot of stress on the basket of a large driver, and the fasteners used to attach it.
  Reply With Quote
Old 16th October 2007, 01:49 PM   #6
Account disabled at member's request
 
MJL21193's Avatar
 
Join Date: Mar 2007
Default Re: Solid oak speakers???

Quote:
Originally posted by tman204

I am going to use solid red oak (not veneered) for the speaker construction. The oak is 1" thick. Dimensions will be 16 x 10 x 6.25. Is there anything special I need to consider when using this material?

Hi,
Safe to use very dry and well seasoned solid for the sides, top and bottom - if the grain is continuous around the box.
Use plywood or MDF or particle board for front and back and just veneer over that.
Good luck.
  Reply With Quote
Old 16th October 2007, 03:05 PM   #7
diyAudio Member
 
Join Date: Oct 2005
I would advise against using Solid wood. If you live in a temparate climate of any kind there will be expansion and contraction of around 3% across the grain. When the solid Oak changes size something has to give and it is usally not the glue joint, it the wood itself. Thus you get cracking. This is the reason why they came up with plywood, Each layer is criss-crossed the other direction keeping the wood stable and from changing size. Wood really only expands width wise not length wise( it does but only 10ths of a %"). Thus the reason for plywood. I'm not saying you can't use hard wood, but if you don't live in the desert It will crack someday.
  Reply With Quote
Old 16th October 2007, 04:24 PM   #8
tman204 is offline tman204  United States
diyAudio Member
 
Join Date: Oct 2007
Default one more question

Thanks all for the advice - I really appreciate it. I'm lucky enough to have a friend who works at a large specialty furniture shop here in Denver, so I have access to all his super cool wood working tools, so this should be a quality build. A six pack goes a long way!

I plan on biscuit joining all sides and gluing as well. I understand the possibility of cracking, I'll just have to tell my father-in-law to make sure he keeps them oiled (wife is set on the oak....)

As far as undesirable resonance - should I fully stuff these bookshelf speakers to help compensate for the density of the oak? Any other internal damping materials to look at?

Thanks again!
  Reply With Quote
Old 16th October 2007, 05:01 PM   #9
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
Although I have only used this method for amplifier construction, you may want to consider a "2-ply" type arrangement. Whereby I made the case from plywood with a 4mm wooden face glued to the plywood so that it becomes one "plank" I used 45 degree mitres to join em at corners and am still most impressed by it.

I hate regular veneers, they are just not durable enough, and the moment a corner is scuffed the illusion is broken. That is why I use this method.... well, mostly becasue i'm too cheap to just buy wood generaly...

But it does give you the expansion resistance of the plywood, with the beauty of solid-wood... Last time I used cedar wood, which is so hard you can get a gloss finish useing 400 grit sandpaper. Realy glad I didn't have to work with thicker pieces.

I received a fresh 2x1m sheet of 4mm thick cherrywood from a friend, two weeks ago, can't wait to think of a project to use them in.
  Reply With Quote
Old 16th October 2007, 05:05 PM   #10
diyAudio Member
 
leadbelly's Avatar
 
Join Date: Dec 2002
Location: Calgary, Alberta
Go for it. The ones are the right are solid oak:
Attached Images
File Type: jpg fullrangers.jpg (26.1 KB, 1029 views)
__________________
Aerodynamics are for people who can't build engines. Enzo Ferrari
  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
let's enjoy the solid wood speakers Jed2JJ Vendor's Bazaar 19 13th August 2009 04:13 AM
Better base for amps & speakers - solid floor or carpet? rick57 Everything Else 0 20th February 2006 01:19 PM


New To Site? Need Help?

All times are GMT. The time now is 01:16 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