TL;DR

Linus teams up with underwater-audio guru Renzo (Synchrosound) to test everything from custom pro-grade hydro speakers to the bone-conduction SHOKZ OpenSwim Pros and a budget Monster S620 Bluetooth speaker—all in a pool. They explain why high frequencies vanish underwater, how bone conduction pulls double duty, and what design tweaks make those pro speakers tick.

After side-by-side splash tests and a deep-dive into the physics, they rank each solution for swimming laps or underwater workouts, so you’ll know exactly which gear actually rocks (or, uh, “sings”) beneath the surface.

Watch on YouTube