Cat-proofing your speakers...

Go to a Bed Bath and Beyond or similar store
Pick up a can of Orange Citrus Mist spray
take a couple plastic sandwich bags apply a small amount of orange spray on and in the bag.and tape low to the back of the speaker
once the cat smells this they stay away and is harmless
Repeat when any new cats enter the room.
Cheers Johnnyr

Drubin
FYI
Cats like to mark there territory.....
With Orange Citrus spray Cats think another more Alpha cat must of marked their turf and stay away.

Cheers Johnnyr