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Conrete in speaker design

 
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terry
Senior Contributor 200+


Joined: 22 Apr 2003
Posts: 262
Location: UK

PostPosted: Sun Aug 10, 2003 11:10 am    Post subject: Conrete in speaker design Reply with quote

Has anyone seen, heard or owned Faraday Sirens? See new addition to website.

Has anyone built or owned speakers made from concrete?

Terry
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guanokalong
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Joined: 06 Nov 2005
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PostPosted: Sun Nov 06, 2005 1:43 am    Post subject: Reply with quote

I thought about that and was wondering if any one had any experience!

I want to make some flat-sounding monitor stereo speaker set, with a load of tweeters, I think I just have to make the moulding for it!

I was also buisy with the thought of having some speakers straight in the wall, while I am building my house now!

responce appreciated!
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ColinR
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Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Sun Nov 06, 2005 12:00 pm    Post subject: Reply with quote

[/quote]I thought about that and was wondering if any one had any experience!
Quote:

Apart from the John Crabbe B139A bass horn the Tip-Top (HI-Fi News October 1967 & November 1967, copies from M. Jones, Falcon Acoustics), no.

The Bassett/Coffin sub-woofer performed just as well i.m.h.o.



I think I just have to make the moulding for it!
Quote:



Regarding the cabinets you'll have to look into the method of boat hull construction using this material.




I was also buisy with the thought of having some speakers straight in the wall, while I am building my house now!

Quote:



Construction of a speaker in a wall is rather limiting in design terms if you want to modify the system, so go for an extension at right angles, or in a corner, so it can be removed or altered.

Concrete block was the favoured material for KEF Cantata kit btw.

I imagine a pair of 104 kit baffles would also benefit from this type of construction.


Ho hum the quotes have gone a little wild - I need a cup of Tea Very Happy .
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proffski
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Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Sun Nov 06, 2005 3:24 pm    Post subject: Reply with quote

Not concrete, a friend not too far away did have some cabinets built in marble by a local firm which make household fittings in the material.
It was only the B200 & T27 partnerhip. I cannot remember but the crossover was probably a standard KefKit item.
They did sound a lot cleaner and VERY fast! Surprised

Alas, no experience with concrete. Sad
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IsakAlexander
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Joined: 05 Jan 2007
Posts: 18
Location: Norway

PostPosted: Tue May 13, 2008 8:13 pm    Post subject: Reply with quote

The Swedish Rauna models are all in concrete, I used to listen to the smallest model at the repairshop, very clean sound. Backbreaking to move..
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lexi
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Joined: 09 Nov 2008
Posts: 13

PostPosted: Wed Nov 12, 2008 6:29 pm    Post subject: Reply with quote

Hard to see how boat hull or ferro cement methods would be used for speaker enclosures. In this design frames are built to shape and bridged over by wire lath or expanded metal. Render ( the concrete) is applied by one plasterer inside and one outside pushing the plaster against each other as it comes through the mesh.

Suppose it could be done if top or front baffle were left open. Shuttering and pouring/vibrating seems easier. For some strange reason women don`t like concrete speakers.........and yet they like the houses made of the same stuff Very Happy
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ColinR
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PostPosted: Thu Nov 20, 2008 7:16 pm    Post subject: Reply with quote

Never seen these then Smile .



http://www.hifiloudspeakers.info/PersonalKefTreasures/JamesTobin/JamesTobin1.html
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thelandlord
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Joined: 23 Oct 2008
Posts: 9
Location: Near Bristol, UK

PostPosted: Fri Nov 21, 2008 10:00 pm    Post subject: Reply with quote

lexi wrote:
For some strange reason women don`t like concrete speakers.........and yet they like the houses made of the same stuff Very Happy


They don't generally try to move the house to hoover under it... Wink
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lexi
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Joined: 09 Nov 2008
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PostPosted: Sat Nov 22, 2008 12:55 am    Post subject: Reply with quote

ColinR wrote:
Never seen these then Smile .



http://www.hifiloudspeakers.info/PersonalKefTreasures/JamesTobin/JamesTobin1.html


Excellent . Look like they are poured? Have seen poured ones before. Concrete is beautiful stuff that can be worked into all shapes.....even when it is green. Lots of nice links and stuff there Colin.
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