What are these metal cages over the drivers for?

[jaxwired]

Is this for sound or just physically protecting the drivers?

 

[Anonymous]

I dunno, but by the look of 'em both I'd say they were dreamed up by one of those "designers" off daytime TV home improvement shows and knocked up out of MDF and an old colander or two!

 

[Anonymous]

I would guess it's either simply to protect them somewhat, from getting knocked, or for some sort of sound dispersion concept?

 

[chebby]

Why not just look it up on their website and read what they say?.....

"It is the first of the PMC range to feature the radically engineered RadialT bass unit. Its colossal exo-skeleton provides exceptional physical and thermal stability by ensuring the cone has a perfect rigid structure to produce enormous excursions and the coil is kept cool by heat sinking properties created by the exposed fins."

http://www.pmc-speakers.com/product.php?mode=view&pid=36

 

[Frank Harvey]

Although I suspect in the case of the non PMC speaker that it's a visual feature.....