Any advice on how to keep my cats from knocking down my stero speakers and other things?

Answers:
lol!
Move everything onto the floor.
It's so cute when they do that. Then they look away like it was not them... lol.

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perhaps you could take up anything valuable or breakable and put them where the cats don't romp?
cats think they own the place, dont' they? i guess that's one thing i like about them.