Sorry to hear about this; I have a lot of home theater equipment in my living room - neither of my cats have puked on them yet, fortunately
When not in use, you could consider placing some type of protective cloth or cover of some type on top of the hi-fi stack to prevent these types of accidents.
At least no one got hurt
I've always imagined that the worse thing that could happen was an unsecured electronic equipment, such as a TV, falling on them for some reason.
Caretaker of two black cats
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