Foam Core Board Speaker Enclosures? - Page 141 - diyAudio
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 27th February 2013, 02:00 PM   #1401
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
Quote:
Originally Posted by xrk971 View Post
Nice work Cal! Why is it less fun than Cornu? Looks like fun to me.
I happen to have some urethane caulk on hand so it's getting messy. It's hard to get the curves right so I am infilling with caulk. Dirty, dirty, my Mother used to say.
Quote:
Originally Posted by KLBIrd View Post
Wow, you are taking foam fabrication to the edge. Even if it does not sound as good as the effort applied, you have pioneered a new technique in enclosure materials and construction.
Thanks Ken, I sure hope it sounds good too.
As mentioned many times, the credit really goes to X, he's the one who started this craziness, I am just following in his footsteps.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 27th February 2013, 02:12 PM   #1402
xrk971 is online now xrk971  United States
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Virginia
Cal,
Why did you have to resort to caulking? Couldn't hot melt to tack and a bead of PVA to seal have worked? I agree that grey caulking is a mess especially if it is silicone. I was thinking about the curves you put in after the main channels - are they really needed? They will improve efficiency but may reduce the effectiveness of those sharp bends to act as low pass filters to keep the HF stuff from getting out. Anyhow, this is a really cool and unique design and I am really excited to hear your first listening impressions. Nice work with the channels - the photo of the central chamber with curved throats leading out is really cool and epitomizes the advantages of working with foam core in rapid prototyping. Very nice!
  Reply With Quote
Old 27th February 2013, 02:22 PM   #1403
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
Quote:
Originally Posted by xrk971 View Post
Cal,
Why did you have to resort to caulking? Couldn't hot melt to tack and a bead of PVA to seal have worked?
Hot melt was only for the tacking but PVA wouldn't work on the vertical joints and it really is too slow to set up. That would drive me crazy, my time is limited and I'm a naturally impatient person.
Quote:
I agree that grey caulking is a mess especially if it is silicone.
Far worse than silicone, it's urethane.
Quote:
I was thinking about the curves you put in after the main channels - are they really needed? They will improve efficiency but may reduce the effectiveness of those sharp bends to act as low pass filters to keep the HF stuff from getting out.
In my mind I am happier with the curves although you may be right.
Quote:
Anyhow, this is a really cool and unique design and I am really excited to hear your first listening impressions.
Me too, fingers crossed. It is many days away though.
Quote:
Nice work with the channels - the photo of the central chamber with curved throats leading out is really cool and epitomizes the advantages of working with foam core in rapid prototyping. Very nice!
Ya, watching it come together is still really satisfying.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 28th February 2013, 12:52 PM   #1404
KLBIrd is offline KLBIrd  United States
diyAudio Member
 
KLBIrd's Avatar
 
Join Date: Jan 2009
Location: Lincoln, Missouri
Send a message via Skype™ to KLBIrd
Check out this site for all types and sizes of foam board materials.

foamcore | foamboard | foam board | gator board | self adhesive

They even have special cutters available.
  Reply With Quote
Old 28th February 2013, 02:06 PM   #1405
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
My goodness that's expensive.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 28th February 2013, 04:56 PM   #1406
xrk971 is online now xrk971  United States
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Virginia
I finally got to see an example of 0.5 in black Gatorboard: it is very nice - flat like a sheet of granite and stiff and strong like good plywood, but light like foam board. They use it at my work to mount big promotional posters and PR material. It seems to be more expensive than BB plywood but I see why - it is closer to an aerospace grade honeycomb structural panel than anything I have seen. You could make an airplane out of it. It would make an awesome and lightweight speaker enclosure. But way pricey... I will have to try home insulation foam sheathing next at $10 for 4x8 ft.
  Reply With Quote
Old 28th February 2013, 06:23 PM   #1407
KLBIrd is offline KLBIrd  United States
diyAudio Member
 
KLBIrd's Avatar
 
Join Date: Jan 2009
Location: Lincoln, Missouri
Send a message via Skype™ to KLBIrd
I've used gator board for model building but prefer Strathmore. Its cheaper and easier to work with. Gator Board speaker enclosures will require more damping materials than the foam board.
  Reply With Quote
Old 28th February 2013, 06:50 PM   #1408
diyAudio Member
 
Join Date: May 2009
Location: Wellington
There's a thread on here about (commercially produced) speaker enclosures made of lightweight but stiff panels, using damping materials to move the resonances to where they are less objectionable.

Interesting read I found on Lossy Cabinet designs by Harbeth
  Reply With Quote
Old 28th February 2013, 09:57 PM   #1409
diyAudio Member
 
Join Date: Jun 2006
Location: Looavull
Quote:
Originally Posted by Cal Weldon View Post
So the interesting part has begun. I am making a big mess and it is going very slowly.

Cutting the channel pieces with a bandsaw works really well but everything else makes me want to cut off my...

This better sound good 'cause this is way less fun to build.

Next time I have a bright idea can someone just smack me up side 'o' the head.
Hey Cal,
I believe this was mentioned earlier, I think by you even, but when I built my set, to combine the strips I cut behind both sides of the paper, folded them over, cut out the foam, and then glued the paper to the next strip. Kinda like a Sheetrock butterfly patch. It looks like you could do the same on those tight corners.

Like I said, probably already discussed. I feel bad for ya though, you are more than likely looking at the belt sander thinking this is the only way to get this stuff off my hands. On a side note, wear rubber gloves when using door and window expanding foam!

All aside, those look awesome.
__________________
Fliping Switches, Pushing Buttons, and Turning Knobs.
  Reply With Quote
Old 1st March 2013, 03:15 AM   #1410
guangui is offline guangui  Puerto Rico
diyAudio Member
 
Join Date: Feb 2013
I finished my uFonken in Foam Core, go to this DIY Audio thread (Page #6 - Post #53) to see my quick opinion and pics.
  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
Speaker damping: Foam or expanding foam akunec Multi-Way 4 11th February 2014 01:14 AM
Replace speaker foam with this odd material? flyingsquirrelman Subwoofers 7 25th July 2010 01:32 PM
concrete board for enclosures? alandarkdale Multi-Way 6 31st March 2007 08:35 AM
Foam core construction for subwoofers morbo Subwoofers 19 30th August 2005 08:09 PM
speaker foam dave k Multi-Way 2 24th June 2003 05:05 AM


New To Site? Need Help?

All times are GMT. The time now is 02:24 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