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-   -   concrete board for enclosures? (http://www.diyaudio.com/forums/multi-way/99038-concrete-board-enclosures.html)

alandarkdale 29th March 2007 06:46 AM

concrete board for enclosures?
 
Yes, I've searched the forum but have been unable to find an answer.

Given the discussions of Baltic Birch vs. MDF vs. solid wood where would the concrete siding material fall?

Sure, I've been able to find enclosures that use cast concrete but what about using pieces of siding cut to appropriate lengths for the constant width walls of Hedlund style horns or the Nagaoka style cabinets?

One company, James Hardie, lists theirs as 5/16" thick and it is available in widths of 5.25', 6.25", 7.25", 8.25", 9.25" and 12". The weight is 2.3 lbs per sq. ft.

http://www.jameshardie.com/homeowner...hardiplank.php

Any thoughts or a pointer to a discussion I messed? It could even be doubled up with glue for interlocking joints, etc.

Dale

slhijb 29th March 2007 04:17 PM

On my current design, I'm using concrete "Hardi" board - smooth surface 1/2" thick, made & for wet environment, sandwiched in-between the 3/4" MDF exterior front baffle panel and the 3/4" baltic plywood interior front baffle panel. Using Liquid Nails to bond to the MDF & BP.

Reasons for use:
- Relatively easy to work with
- High mass
- High density
- Rigid
- I like using dissimilar type materials in speakers
- Strong & not brittle (will not crack or spall under loudspeaker type conditions) - Hurricane force resistant

Not done with the speakers, so can't discuss an end result.

Hope this helps.

Ed LaFontaine 29th March 2007 04:44 PM

Durock is another brand name. It is available in 1/4" thickness. Bob Brines uses cement board along with Armstrong #420 acoustic ceiling tiles to line his enclosures. I obtained both materials from Lowe's.

planet10 29th March 2007 08:19 PM

Used in conjnction it can have some benefits, by itself it is not all that good a panel material.

dave

alandarkdale 30th March 2007 04:15 AM

In combination with...... ?

Waferwood ?

Thinner BB ?

Fir Plywood ?

MDF ?

Are any combinations worth the investment of extra effort over .75" 18mm 13 ply sheetgoods?

planet10 31st March 2007 03:15 AM

Quote:

Originally posted by alandarkdale
Are any combinations worth the investment of extra effort over .75" 18mm 13 ply sheetgoods?
Personally i would never use it... it is counter to what i try to achieve in my boxes. To my mind adequate bracing is more effective.

dave

alandarkdale 31st March 2007 08:35 AM

'nuf said. :xeye:

Thanks


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