All open-ear audio technologies produce some sound leakage — it is fundamentally a physics trade-off. As smart glasses evolve to feature screen-free AI assistants where voice and audio are the primary interaction models, managing this audio is critical.
Many smart glasses utilize directional audio, employing techniques like phase-cancellation to beam sound directly into your ear with minimal leakage. While this is crucial for privacy, it cannot completely defy physics; at higher volumes, nearby people can still hear what you are listening to.
Bone Conduction technology also experiences leakage. Even though the transducers are designed to vibrate bone rather than push air, these intense vibrations inevitably create airborne sound waves. The harder these transducers work to deliver higher volumes, the more sound escapes into your surroundings. This open-ear approach is fundamentally different from traditional sealed earbuds, which physically contain the acoustic energy entirely within the ear canal.
Privacy in public spaces remains a significant concern for wearable consumers, making it essential to understand how to use these devices respectfully.
At moderate volumes (50–70%), most smart glasses are reasonably private. In environments like a bustling cafe or an active office, background noise naturally masks any minor leakage. However, at maximum volume, you should expect people within 1–2 meters to clearly hear your audio.
To optimize your experience, consider these practical tips:
Use moderate volumes in quiet environments to maintain your privacy.
Rely on natural masking in noisy environments, which allows you to safely increase your volume.
Recognize that directional speakers with good beamforming typically leak less sound than Bone Conduction alternatives at equivalent volumes.
Ultimately, sound leakage is the functional trade-off you accept in exchange for complete Situational Awareness and all-day ear comfort. For truly private listening, sealed earbuds remain the best option.
How smart glasses preserve your ability to hear traffic, people, and environmental hazards while delivering audio — and why this is a genuine safety feature, not just convenience.
A consumer-friendly guide to bone conduction technology in smart glasses — how it works, its clinical heritage, real-world use cases, and honest limitations.
A consumer-friendly comparison of the two fundamentally different ways smart glasses deliver audio — through the air (traditional) or through your skull (bone conduction).