The ozone that is responsible for most of the degradation of rubber or foam is generated inside the cabinet by the electric field of the voice coil.
Learn something new every day! Thanks for this!
Agree to ’let sleeping dogs lie’ in the rubber-surround dept (unless perhaps you are in the desert and there’s never any humidity) and second the idea of a gentle vacuum brush. I understand the rationale for paper cones but they can definitely be fragile in use.