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Recommendations on baby-proofing?
(lemmy.world)
A community discussing turntables, vinyl and the art of listening to high-fidelity music on spinning platters.
Are those Kallax shelves from IKEA? If so, they sell door inserts that could likely be reinforced with baby-proof door latches.
It's also good practice to secure any furniture to the wall with anchors.
For the speakers, you could do something creative with wall mounts (Either to the wall or the shelves themselves)