DUET concept is a hybrid headphone and speaker in one - Yanko Design
Briefly

DUET is a hybrid audio device that combines private headphone listening, shared speaker playback, and spatial audio in one compact product. The device uses mini bone conduction speakers that transmit vibrations through surfaces, enabling loud shared sound without large drivers. Headphone ear chambers have thin walls and scattered holes to dampen vibrations and preserve privacy. In speaker mode the mini speakers twist and lock into a thicker hollow housing that amplifies volume through surface resonance and a friction fit secures them. The concept aims to eliminate the need to constantly switch between headphones and speakers and to keep music with the user across environments.
Imagine never having to choose between your headphones and your speaker again. DUET is a groundbreaking audio device concept that blends private listening, shared speaker playback, and spatial audio into a single, easy-to-use product. This hybrid approach means you can switch effortlessly between listening modes, whether you're on the move, relaxing at home, or hosting friends. DUET is designed to simplify your audio setup, save you money, and ensure your music is always with you, wherever you go.
At the core of DUET's innovation are its mini bone conduction speakers. Unlike typical speakers that rely on pushing air, bone conduction speakers transmit vibrations directly through surfaces, turning them into amplifiers. This technology allows DUET to remain compact while still delivering impressive sound quality. The headphone ear chambers are designed with thin walls and scattered holes to dampen the bone conduction effect and keep audio private.
Read at Yanko Design - Modern Industrial Design News
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