that stuff will pull the veneer and/or paint off your speakers, be warned.
Congrats on your new friend... she looks very at home with you. My cats have always had their claws too. We had a problem with one cat scratching furniture and talked to our vet about it. In the neighborhood he's referred to as the "cat whisperer". Great with medical issues but also good with behavior problems like scratching, not using the litterbox, etc. He pointed out that in the wild a cat will use a tree to scratch and sharpen their nails. If you don't give them something as sturdy as a tree they'll use your sofa, speakers, etc. Whatever won't move when they scratch. That made perfect sense to me. Bought a big cat condo that weighs a ton and I've never had any problems with cats scratching anything other than that. He also recommended an empty can with some coins in it (tape over the opening) and shake it if you do catch them doing something they shouldn't. All I have to do is reach for the can and my cat bolts... I can't remember the last time I had to use it though. I know it's been years.
You might try that and see if she uses it over the speakers... or not... I don't know that I would take the chance with those Infinitys either. Just wanted to offer up my experiences.
What, specifically, is the problem that needs fixed? Vibrating grill or ?? You never stated in the OP.
I don't know where to go with this... ruining a perfectly good pair of speakers due to an adopted "yard rat". I have a military bred GS dog that is now approaching 12 years old, and has never messed with any of my audio gear. I have several solutions, but you most likely won't like any of them.
I could tell you what to do with your GS dog but you probably wouldn't like it.
May I make a different suggestion? Why not make some metal mesh grilles, or have some made? That'll offer the best protection, and keep the cosmetics. See this page...
http://www.speakerworks.com/speaker_grills_s/34.htm
Good on you for giving an animal a home! She's very pretty.
G~
(the one in the middle on the top row is what I'm looking at, the black perforated steel)
Nice looking cat. There are just so many at the shelter aren't there... Don't have any ideas but the coffee can with pennies in it is a good one. We had a cat which love to sharpen his mitts on the spines of our album covers while on the shelf. Totally shredded many of them. Never could get him to not do that.
My dog will do anything for a piece of cheese the cat is a different story. I think they own us...love em though. Best of luck with her.