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Occams razor of Parametric sound
....And directional high-fidelity commercial audio systems (Sound from ultrasound)[28] Parametric receiving arrays can also be formed for directional reception.[29] In 2005, Elwood Norris won the $500,000 MIT-Lemelson Prize for his application of the parametric array to commercial high-fidelity loudspeakers.
A directional device is risky because it can bounce off walls.