Honeycomb composite panel enclosure, dual opposed configuration - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 23rd August 2010, 06:21 AM   #1
diyAudio Member
Join Date: Jun 2005
Location: Singapore
Default Honeycomb composite panel enclosure, dual opposed configuration

Has anyone tried building a subwoofer from honeycomb panels? They would be very light, yet have high stiffness. Not sure about the damping characteristics of the panels vs plywood though.

Basically beam bending theory, kind of like an I beam, the material far away from the middle is doing all the work, so the honeycomb core with the composite panels.

The resultant enclosure would be very light, so will likely have to use dual opposed configuration to cancel out vibrations .

Any thought and comments?

honeycomb composite panels - Google Search
  Reply With Quote
Old 24th August 2010, 09:30 PM   #2
diyAudio Member
Join Date: Jan 2004
Location: Toronto, ON, Canada
No point in building the enclosure out of it, as you can make a regular enclosure stiffer by specifying thicker walls

As for the sub diaphragm, B&W did that with their Rohacell
  Reply With Quote
Old 24th August 2010, 09:52 PM   #3
diyAudio Moderator
planet10's Avatar
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
But a thicker wall would increase the mass.

I think this would be an interesting project. With push-push woofers, little energy gets into the box, i'd look at the opposing baffles, and push-push drivers as a subassembly, with the light weight composite panels as a "cover" for the 4 open sides. Feet could be loaded into the baffle bits.

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 25th August 2010, 02:05 AM   #4
Djim is offline Djim  Netherlands
diyAudio Member
Join Date: Dec 2009
Location: Les Pays-Bas
Honeycomb panels can work if you glue lots of panel bracing in (intersections of about 4 to 5 inches) and you could use a few plastic tubes (fill them with fibre) for wall to wall bracing (use strong 2 component glue for that) . After you’re finished you could ‘paint’ the inside with a thick layer of liquid rubber. Or do it the old fashion way by melting a layer of roof felt (or clean pitch) in each intersection. If you want to keep weight to minimum spray glue on the inside with ‘felt flakes’ (correct English word?) on top. That’s the same technique the use for panels in cars but is a little less efficient in damping. Of course all these measures will increase mass but it is still light.
  Reply With Quote
Old 31st August 2010, 01:43 AM   #5
diyAudio Member
Join Date: Jan 2004
Location: Toronto, ON, Canada
Originally Posted by planet10 View Post
But a thicker wall would increase the mass.
So? Increasing the thickness of the wall increases the mass proportionally (and mass is not always a bad thing), but increases the stiffness by the cube.
  Reply With Quote
Old 1st September 2010, 01:27 PM   #6
diyAudio Member
Join Date: Jan 2005
Location: Rotterdam, NL
I've build an composite enclosure but am still in the testing stage. In due time I will release more info about it.

Best regards Johan
Impossibilities we do immediatly, miracles take slightly longer.
  Reply With Quote
Old 1st September 2010, 03:26 PM   #7
diyAudio Member
Join Date: Jun 2004
Location: sheffield
Send a message via MSN to sq225917 Send a message via Skype™ to sq225917
if you want to make the subwoofer lighter, maybe a little bit smaller, then try it, but it probably won't sound any different.
Paradise Pre-reg PSU PCBs
  Reply With Quote


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
How to model dual VC drivers in MTM configuration? dhieber Multi-Way 0 14th November 2009 12:19 AM
Opposed dual driver sub woofer. tade Subwoofers 10 18th April 2005 09:51 PM
dual dac configuration benefits?? Htguy Digital Source 1 28th March 2005 06:30 AM
enclosure configuration via ports ChesterFuzzin' Multi-Way 3 17th December 2003 08:34 AM

New To Site? Need Help?

All times are GMT. The time now is 01:15 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2