what to do with my cat on my speaker grills

Place a large dog in front of the speaker. Cats hate woofers!

I make protective boxes out of foamboard, with only the top, sides, & front, to go over all my speakers. no back or bottom, so they just slide over them to protect.

Don't use the grills. Put a scratching post nearby and prime it with catnip.

Sell cat!!

Straitjacket?

nah, I like the idea of using smells that repel cats nearby and/or keeping the cat out of the room altogether if possible.

Declawing can help but not sure how well received that is these days for cats medically. I had an apparently healthy adult cat declawed once prior to moving into a new house and the stress triggered undetected dormant feline leukemia and I had to have the cat put to sleep.