Do you "treat" your speakers rubber surrounds?

Armour-All deadened the sound of a low value test speaker once. It had foam rubber surrounds, but still the effect was large and not good. I would stay away from anything with silicon.

I would say don't put anything on foam. Rubber however can dry out and crack due to environment and age. I see nothing wrong with treating rubber surrounds with something that will protect, lubricate and repel moisture and dirt. Sounds like this 303 may be worth a shot. After all our skin likes to be well lubricated to maintain its elasticity.

+1 to mink oil or the 303 Aerospace Protectant.

Must admit I've not considered treating rubber speaker surrounds.  But since I'm restoring a pair of classic A-25s for the den maybe I should.

I have used a treatment called Rubber Renue by MG Chemicals on rubber belts for turntables, CD drawers, and tape decks and that seems to be beneficial.  I feel safe with that since it is formulated for rubber applications.

I used Armor All on a car’s dashboard cover.  It made it crack faster.  Then again, the dash is vinyl.  I imagine it would be worse for rubber.