Cat-proofing your speakers...

You can get glue-on soft-plastic caps for cat claws. They periodically shed with the claws as they grow out, but for a scratcher, it's a good solution that's a lot safer and more humane than de-clawing, and it's not permanent. They last a few weeks before falling off, and are cheap and easy to apply.

As cats get older, they usually calm down, and disruptive behaviors are less of a factor, and easier to control (as in, yelling starts to actually work). I would not have made it past kitten stage with my latest cat without the claw caps, but thanks to them, things are cool.

I realize the OP has asked specifically about how to deal with clawing, but there is another issue with cats, and dogs for that matter - chewing . . . . If I ever figure out a solution, I will certainly share it.

A new audiophile term to be added to WAF; CDF. Where the d could be distruction or disposal.

Maybe a pair of electrostats, leave the grills off (strictly for training purposes of course).