concrete board as a speaker cabinet

serosmaness · 27th November 2005, 04:48 PM

Has any one tried this or is it not practical. 1/2 inch hardybacker.
Serosmaness

youyoung21147 · 27th November 2005, 06:05 PM

you mean pure/raw wood boards ??

It is overkill for a speaker cabinet IMHO

Moreover, pure wood boards are not adapted for speaker building because their properties change with time due to the water remaining inside them, a problem you won't get (or you are not likely to get in "normal" conditions) with MDF or plywood board.

chipco3434 · 27th November 2005, 06:21 PM

No, he means cement board.

Woven glass mesh with a cement core.

Wonderboard is another example.

youyoung21147 · 27th November 2005, 06:28 PM

Quote:

Originally posted by chipco3434
No, he means cement board.

Woven glass mesh with a cement core.

Wonderboard is another example.

Ooops sorry I don't have the english skill necessary to talk about this stuff

I should have searched a translation before

Never tried this so I cannot say anything.

It should be OK if you find thick enough boards, as it has a well damped sound when you knock on it.

But maybe the hardest part would be building a neat cabinet with that.

Good luck !

Greets !

pinkmouse · 27th November 2005, 06:43 PM

It's very stiff, (good

), but very porous to air, (bad

). If you laid it up with another material it should work well.

Variac · 27th November 2005, 06:58 PM

I'm not sure how stiff it is... Try picking up a sheet of it-its as flexible as plywood I'd say. The fibers make it similar to ferrocement which can be surprisingly flexible. It may still be a good material, but people tend to assume: cement= stiff

planet10 · 27th November 2005, 06:58 PM

Not suitable for loudspeaker enclosures IMO.

dave

Scottmoose · 27th November 2005, 09:27 PM

Chronic resonance at low[ish] frequencies alone. Only suitable for killing MDF resonances as a compound panel as far as I can see (I believe Bob Brines does this, or something similar to good effect)

pinkmouse · 27th November 2005, 11:09 PM

The stuff, (known as blueboard in the building trade), we get over here in the UK, is usually used as tile backing and is very stiff, much more so than plywood.

serosmaness · 28th November 2005, 02:10 AM

Thanks for the replys.
I used the wonderboard under ceramic tile in my house and was courious how the 1/2 inch thick board would work with the fostex 108s
One problem would be building the cabinet. Connecting the boards to each other.
I just wondered if anyone had tryed to use the concrete boards before for cabinets?
Thanks again.
Steve

27th November 2005, 04:48 PM	#1
serosmaness diyAudio Member Join Date: Jan 2004 Location: Cortez Colo.	concrete board as a speaker cabinet Has any one tried this or is it not practical. 1/2 inch hardybacker. Serosmaness

27th November 2005, 06:43 PM	#5
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	It's very stiff, (good ), but very porous to air, (bad ). If you laid it up with another material it should work well. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

27th November 2005, 06:58 PM	#6
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	I'm not sure how stiff it is... Try picking up a sheet of it-its as flexible as plywood I'd say. The fibers make it similar to ferrocement which can be surprisingly flexible. It may still be a good material, but people tend to assume: cement= stiff __________________ Burning Amp Festival Sunday, October 28th, 2012 in S.F. We need Volunteers & sign-up's for what you're bringing!

27th November 2005, 06:58 PM	#7
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Not suitable for loudspeaker enclosures IMO. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

27th November 2005, 11:09 PM	#9
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	The stuff, (known as blueboard in the building trade), we get over here in the UK, is usually used as tile backing and is very stiff, much more so than plywood. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort


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27th November 2005, 06:05 PM	#2
youyoung21147 diyAudio Member Join Date: Apr 2005 Location: Belfort	you mean pure/raw wood boards ?? It is overkill for a speaker cabinet IMHO Moreover, pure wood boards are not adapted for speaker building because their properties change with time due to the water remaining inside them, a problem you won't get (or you are not likely to get in "normal" conditions) with MDF or plywood board.

27th November 2005, 06:21 PM	#3
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	No, he means cement board. Woven glass mesh with a cement core. Wonderboard is another example.

27th November 2005, 09:27 PM	#8
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	Chronic resonance at low[ish] frequencies alone. Only suitable for killing MDF resonances as a compound panel as far as I can see (I believe Bob Brines does this, or something similar to good effect)

28th November 2005, 02:10 AM	#10
serosmaness diyAudio Member Join Date: Jan 2004 Location: Cortez Colo.	Thanks for the replys. I used the wonderboard under ceramic tile in my house and was courious how the 1/2 inch thick board would work with the fostex 108s One problem would be building the cabinet. Connecting the boards to each other. I just wondered if anyone had tryed to use the concrete boards before for cabinets? Thanks again. Steve

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