On 30/01/2021 07:03, David wrote:

https://www.richersounds.com/clearan...4.html?instore


Its the other way around.

It is intended to contain and stop a fire spreading in the void of a
suspended ceiling

Yup

should the fire start in the speaker.

Fire spreading from anywhere below is more likely the reason for
installation.

Ceilings are normally a fire barrier protecting the room above, unless
someone pokes holes in them for speakers and downlighters.

An intumescent material (one that swells when heated to block up gaps)
is part of the blanket, which is also fire retardant.


For PA systems they are usually called fire domes.


--
Adrian C