In article ,
David wrote:


"Dave Plowman (News)" wrote in message
...

In article ,
David wrote:
It is intended to contain and stop a fire spreading in the void of a
suspended ceiling should the fire start in the speaker.

Crikey. I've seen a few fried speakers - but one which went on fire? ;-)

Its not the voice coil of the speaker that causes the problem, but on
100V line systems it's usually the matching transformer that can go
AWOL. And on a large system, all that audio power can heat up the
transformer fairly quickly.

I doubt many use 100v line domestically.

With older low voltage lighting, you could have load of transformers in a
ceiling void. And I can see one of those catching fire long before a 100v
line type.

--
*It is wrong to ever split an infinitive *

Dave Plowman London SW
To e-mail, change noise into sound.