Linus and Renzo test three ways to jam underwater—custom hydroacoustic speakers built by Synchrosound, bone-conduction Shokz OpenSwim Pros, and a budget Monster S620 waterproof Bluetooth speaker—all demoed poolside.
They dive into the weird physics of underwater sound (high frequencies get zapped) and show how bone conduction bypasses water’s filtering, revealing which gear truly keeps the beats flowing during laps and underwater workouts.
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