I still like my PMC GB1i speakers a lot. They are slim and sound great, but have one practical disadvantage in our house: our cat is heavy enough to knock them over. The relatively narrow spiked bases don’t offer much resistance against toppling.

Sully, 6+ kilos .. no contest

How are the steel spikes meant to “isolate” speaker cabinets from the floor, i.e. what’s the physics behind this hi-fi orthodoxy? Steel conducts sound quite well. I suspect the actual beneficial effect (if anything) is to anchor the cabinets firmly to the floor, allowing the drivers to push air while resisting Newton’s third law moving the cabinets in the opposite direction.