Anything between "doubled" MDF?

tommak · 15th July 2005, 02:17 AM

I'm building a sealed sub using an Ascendant Audio Atlas 15 and was planning to use double sheets of 3/4 inch ( 18 mm ) MDF for all six sides. Is there any advantage of putting any material between the MDF sheets, or simple glue and clamp them? Or if someone would please direct me to anywhere on this forum or web that might discuss this?

audio-kraut · 15th July 2005, 03:15 AM

You can use some sound dampening material - i think its called black hole - mineral loaded plastic in between. I did this, resultet in a very "dead" box.
For my subs - was too lazy - I used just 1" mdf.

simon5 · 15th July 2005, 05:35 AM

If you use only glue, it will be ok.

noodle_snacks · 15th July 2005, 07:34 AM

yes

Raoul · 15th July 2005, 08:21 AM

If you search for "sand sandwich" you will find a few ideas on mixed material enclosures. I have a Brahma 12" in a ported box, constructed of 3/4" MDF with a layer of 1/2" MDF glued to the outside. The result is a very dead box. Just be sure to clamp the two layers together well, or use a lot of weight to hold the layers together as the glue dries (this was my method).

AndrewT · 15th July 2005, 06:57 PM

Hi,
I used double 18mm chipboard with a thick layer of bitumastic as a glue between them.
Then left a long time, about a month, to go off ( stop emitting fumes) before mounting the drive unit.

TNT · 15th July 2005, 07:11 PM

Absolutly but not odinary hard glue ...

http://www.swedac-acoustic.se/pages/vibra.damp.htm

This will give You a dead box !

/

morbo · 15th July 2005, 07:25 PM

search around for 'constrained layer damping', there is all sorts of info around on this topic.

TNT · 15th July 2005, 10:55 PM

Also, don't use the same thickness on the two bords. This togheter with a visco elastic glue is among the best you can use. 22 mm / 2 mm glue / 16 mm is a killer !

/

Paradise_Ice · 16th July 2005, 01:59 AM

Hot Glue, varnish, and normal wood glue are all fine and dandy

15th July 2005, 02:17 AM	#1
tommak diyAudio Member Join Date: Jun 2003 Location: Raleigh, NC	Anything between "doubled" MDF? I'm building a sealed sub using an Ascendant Audio Atlas 15 and was planning to use double sheets of 3/4 inch ( 18 mm ) MDF for all six sides. Is there any advantage of putting any material between the MDF sheets, or simple glue and clamp them? Or if someone would please direct me to anywhere on this forum or web that might discuss this?

15th July 2005, 05:35 AM	#3
simon5 diyAudio Member Join Date: Nov 2004 Location: Québec, Québec	If you use only glue, it will be ok. __________________ DIYaudio for President !

15th July 2005, 06:57 PM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, I used double 18mm chipboard with a thick layer of bitumastic as a glue between them. Then left a long time, about a month, to go off ( stop emitting fumes) before mounting the drive unit. __________________ regards Andrew T.

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15th July 2005, 03:15 AM	#2
audio-kraut diyAudio Member Join Date: Apr 2004 Location: 12km off the alaska highway in northern BC	You can use some sound dampening material - i think its called black hole - mineral loaded plastic in between. I did this, resultet in a very "dead" box. For my subs - was too lazy - I used just 1" mdf.

15th July 2005, 07:34 AM	#4
noodle_snacks diyAudio Member Join Date: Mar 2004 Location: Hobart, Tasmania	yes

15th July 2005, 08:21 AM	#5
Raoul diyAudio Member Join Date: Feb 2003 Location: OR	If you search for "sand sandwich" you will find a few ideas on mixed material enclosures. I have a Brahma 12" in a ported box, constructed of 3/4" MDF with a layer of 1/2" MDF glued to the outside. The result is a very dead box. Just be sure to clamp the two layers together well, or use a lot of weight to hold the layers together as the glue dries (this was my method).

15th July 2005, 07:11 PM	#7
TNT diyAudio Member Join Date: Apr 2003 Location: Sweden	Absolutly but not odinary hard glue ... http://www.swedac-acoustic.se/pages/vibra.damp.htm This will give You a dead box ! /

15th July 2005, 07:25 PM	#8
morbo diyAudio Member Join Date: Sep 2004 Location: Guelph, Ontario	search around for 'constrained layer damping', there is all sorts of info around on this topic.

15th July 2005, 10:55 PM	#9
TNT diyAudio Member Join Date: Apr 2003 Location: Sweden	Also, don't use the same thickness on the two bords. This togheter with a visco elastic glue is among the best you can use. 22 mm / 2 mm glue / 16 mm is a killer ! /

16th July 2005, 01:59 AM	#10
Paradise_Ice diyAudio Member Join Date: Jun 2004 Location: cosmological consciousness	Hot Glue, varnish, and normal wood glue are all fine and dandy

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