which stuffing material? - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 5th December 2004, 06:00 PM   #1
diyAudio Member
 
Bill Fitzpatrick's Avatar
 
Join Date: Jun 2001
Location: Eugene, OR
Default which stuffing material?

Of all the stuffing material available, which has the greatest potential for providing an increase in the apparent box volume?
  Reply With Quote
Old 5th December 2004, 07:06 PM   #2
diyAudio Member
 
BassAwdyO's Avatar
 
Join Date: Jun 2004
Location: Illinois
Send a message via AIM to BassAwdyO
The theory behind the apparent increase in box volume is the idea that the sound waves must travel around the fibers of the stuffing creating a longer path to the other side of the enclosure. Assuming that is correct, I would think that something with ALOT of fibers would be best.
__________________
The golden rule of DIY:
Build nice, or build twice!
  Reply With Quote
Old 5th December 2004, 08:05 PM   #3
simon5 is offline simon5  Canada
diyAudio Member
 
Join Date: Nov 2004
Location: Québec, Québec
That or you can pack it tighter.
__________________
DIYaudio for President !
  Reply With Quote
Old 6th December 2004, 01:56 AM   #4
Ron E is offline Ron E  United States
diyAudio Member
 
Ron E's Avatar
 
Join Date: Jun 2002
Location: USA, MN
Quote:
Originally posted by BassAwdyO
The theory behind the apparent increase in box volume is the idea that the sound waves must travel around the fibers of the stuffing creating a longer path to the other side of the enclosure. Assuming that is correct...
It isn't correct.

A fiber the size of a hair doesn't present a barrier to a wavelength the size of a room. The standard line goes that the fibers absorb and release heat and change the compression and expansion to isothermal rather than adiabatic - causing a reduction in the speed of sound and thus making the box appear bigger. Having said that, I do not believe that toeing the party line reveals the truth.. The true mechanism is more complicated - and may be a viscous effect rather than the thermodynamic effect that is most frequently cited.

I believe that fiberglass is probably the best, and certainly the most cost effective.
__________________
Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan
Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley
  Reply With Quote
Old 6th December 2004, 01:59 AM   #5
diyAudio Member
 
BassAwdyO's Avatar
 
Join Date: Jun 2004
Location: Illinois
Send a message via AIM to BassAwdyO
Either way, I havent found any reason to believe stuffing actually attributes to better sound quality in the bass region.
__________________
The golden rule of DIY:
Build nice, or build twice!
  Reply With Quote
Old 6th December 2004, 06:44 AM   #6
Collo is offline Collo  Australia
diyAudio Member
 
Collo's Avatar
 
Join Date: Nov 2004
Location: Newcastle, Australia
Send a message via MSN to Collo
I read somewhere that fibreglass is no good to use because the fibres are too brittle, causing them to disintegrate and become lodged inside the motor assembly of your drivers. I just stick with the normal stuff you get from Jaycar

Collo
  Reply With Quote
Old 6th December 2004, 04:17 PM   #7
tiroth is offline tiroth  United States
diyAudio Member
 
Join Date: Dec 2001
Location: Pittsburgh, PA, USA
Quote:
Originally posted by BassAwdyO
Either way, I havent found any reason to believe stuffing actually attributes to better sound quality in the bass region.
You should come listen to my latest speaker. Unstuffed, it sounds atrocious, so much so that I considered going back to the drawing board. Stuffed, it is nice and tight. There was a major difference in measured total Q.

It may be true that stuffing will not contribute significantly to a design that already is perfect (although I still think it would help damp the backwave on drivers with light cones), but it is completely false that stuffing has no effect when used in boxes that are "too small."

I too am interested in Bill's question; I've always suspected that fiberglass would be a superior material in everything other than safety, but I've never seen any real tests on performance of different materials.
  Reply With Quote
Old 6th December 2004, 04:34 PM   #8
diyAudio Member
 
serengetiplains's Avatar
 
Join Date: Feb 2004
Location: Canada
Has anyone tried duck or goose down? It deadens sound like no other substance I know.
  Reply With Quote
Old 6th December 2004, 05:01 PM   #9
diyAudio Member
 
Bill Fitzpatrick's Avatar
 
Join Date: Jun 2001
Location: Eugene, OR
I tried a whole live goose once but the system sounded honky.

My original question was only for information purposes. The enclosure is a 5000 cu.in. woofer box that would effectively go to 6000 if stuffed. That amounts to a minor Q change and a difference of 1 db at 30Hz according to WinISD.

Fiberglass doesn't cut it for mid-range boxes where everything from the back of the cone should go into a black hole.

I remember speakers from the 70's where most mfgs. would just toss in a few big hunks of fiberglass and call it a day.
  Reply With Quote
Old 6th December 2004, 05:04 PM   #10
diyAudio Member
 
BassAwdyO's Avatar
 
Join Date: Jun 2004
Location: Illinois
Send a message via AIM to BassAwdyO
I'm just saying that I personally havent experienced any difference with stuffing and not. I'm not saying that it 100% doesnt and cant do anything. Did Q raise or lower? What kind of stuffing did you use?
__________________
The golden rule of DIY:
Build nice, or build twice!
  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
Aerogel as a loudspeaker stuffing material Oborous Multi-Way 13 21st November 2006 06:58 PM
CHEAP stuffing material! Klimon Subwoofers 3 5th March 2006 06:55 PM
Stuffing material obstructing airflow query: tktran Multi-Way 7 5th July 2005 04:45 PM
Stuffing Roy Lewis Multi-Way 2 28th April 2004 06:53 PM
Which stuffing material to increase "perceived" enlosure size? Two Moons Multi-Way 4 6th January 2002 04:27 PM


New To Site? Need Help?

All times are GMT. The time now is 06:44 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