Cat’s are territorial and since you probably don’t lay down on the stereo stuff you have they think oooh mine! There are a few ways to help you but do not squirt Ms whiskers with a little water pistol or dump essential oils on your stereo! Lol
try to put the cat in another room and give them a space to make their own base camp with their bed there and a litter box near bass camp not tucked far away in a corner!