I've found this to be extremely effective and as a bonus it waters the Shag carpeting in our living room when activated.
https://www.youtube.com/watch?v=7jHYV6nJksw
DeKay
just wanted to share my fix for making my speakers cat and grand kid proof!
you can get black chicken wire ( and other colors ) fr hardware store and easily make theses and prob do a better job than i did it is virtually acousticly transparent. this really works and we love our 15 cats all recues , mostly tamed formerly ferals
ferals are best pets ! smart , strong like to play . loyal , will bond amazingly well 