Thanks for all the suggestions, except for the one from Buconero117 (you're insane! I can't just "give it all up"). I'm preparing for the worst practically and mentally, and I think I'll try gates around the speakers first and then an electrical fence, as a last resort.
Child-Proof Speakers
I have a six-month-old now and in the process of trying to child-proof the house. I'd like to keep the sound system in the living room, where the whole family can enjoy it, but concerned about the little one knocking something over, getting hurt in the process and/or breaking a valuable piece of equipment. I recently got a cover for my Rogue Audio Cronus Magnum (so she doesn't get burned on hot output tubes) and bought an equipment rack with closable doors. The next step is potentially replacing my stand-mounted speakers (Sonics Anima) with less tip-able floor-standing ones with more robust drivers (less vulnerable to being prodded by child fingers). Any recommendations on speakers in the <$3000 range? I listen to mainly rock, reggae, world and jazz, and usually on vinyl. I really like the Sonics and Audio Physic sound as well but looking for other options too.