I'd keep the Proac's at least until you get the cats better trained. Ever since he was a kitten, my cat gets a regular nail trimming where his nails are shortened back to the thick sections. He sometimes even purrs when I do it so it doesn't need to be a fight and certainly doesn't hurt him. He also has had a "teepee" to scratch on. He once put a paw toward the speaker grills and I hissed loudly at him. Eyes big as saucers with a dumbfounded look, but he has since not made a move against them. Try different things and be patient and you should find a way to end their unwanted behavior.
What would you do??
I currently own a set of ProAc Super Towers that are about twelve years old. They sounded terrific when I purchased them but the sound has really degraded with the subsequent destruction of the speaker surrounds by my cats. I have already replaced two of the four drivers and three are currently in sad shape right now. The cabinets are not too bad but they are not perfect. My question is would you go to the expense of replacing all the drivers or just go buy set of new speakers. The drivers are about $200 Can. a peice.It has been a few years since they have sounded really nice but I know that my wife would never let me spend the kind of dollars that those size ProAc's would fetch today so its either cheap replacement speakers or refurbish what I got. What would you do?