Yes - there's a risk, sorry!
My male cat began spraying when another male cat sneaked in to our house one night. Since then, he's never really settled and feels the need to define his territory quite often, mostly outdoors but sometimes inside!
Spraying is a natural instinct for a cat, particularly if the cat is stressed or territorial.
Plus, neutering only works to stop agressive and territorial behaviour in around 80% of cats. That leaves around 20% that will still behave how they did before they had the 'snip'
It's usually male cats that spray, but females can do it too, it's just not as common.
If you do get the dreaded 'spray' anywhere near those expensive speakers, i'd suggest a solution of biological washing powder and hot water to clean the area, then use a spray, at cat nose height, (such as Feliway) which mimics the cats happy scent, therefore reducing the cats need to mark their territory.
Works for us, although we still have the odd 'accident'.
I assume (and hope) that he'll grow out of it one day!
Will your cat be allowed outside? If your cat will be indoor only, then there will be less chance of it spraying, as long as he/she doesn't see all the rival cats out the window.
Another thing you can do is provide a vertical flat surface specifically for the cat to spray.
Hope this helps - and good luck.