Open-ear earbuds and sound leakage: why it happens, when it matters, and what leaks least

The direct answer

An open-ear earbud is a small loudspeaker sitting a few millimeters from your ear canal, pointed at it. Most of its output goes in. Some goes around, because there is no seal to stop it, and that fraction is what your neighbor hears. The quieter the room and the louder your volume, the more of it they notice. This is physics, not a manufacturing defect, and no open-ear on the market eliminates it. Several reduce it.

Why open-ears leak

A sealed in-ear works against a closed pocket of air: the tip blocks the canal, the driver pressurizes that pocket, and almost nothing escapes. Remove the seal and the driver is pushing air into an open space. To get enough of it into the canal, the maker raises the driver's output and aims it, which means the part that misses is also louder. Makers attack this in three ways: directional aiming (Shokz calls its version DirectPitch, and its bone conduction page describes the goal as “reducing the potential impact on others”), phase-cancellation tricks that send an out-of-phase signal outward, and simply placing the driver closer to the canal opening. All three help. None seal anything.

Does bone conduction leak less?

Differently, not necessarily less. Bone conduction transducers vibrate against the skin in front of the ear; the vibration you feel as sound also vibrates the air around the pad, so at high volume a neckband produces an audible buzz that others can hear. At low and medium volume it is often quieter to bystanders than an air-conduction hook, because there is no speaker pointed at open air at all. SoundGuys' bone conduction roundup notes the Suunto Wing's “excessive vibrations at high volumes,” which is the same phenomenon from the wearer's side. Shokz's newer DualPitch models add an air-conduction unit for bass, which reintroduces a small amount of ordinary leakage. Net: bone conduction at moderate volume is the quietest open design for the people around you; at high volume it isn't.

When it matters, and when it doesn't

• Doesn't matter: a gym with music playing, a road, a trail, a bike lane, a kitchen. The ambient level is above what leaks. This is 90% of what open-ears are bought for.
• Matters a little: an open-plan office with normal chatter, a bus. Keep volume moderate and nobody notices.
• Matters: a library, a quiet train car, a shared bedroom, a waiting room. Here an open-ear at the volume you'd use outdoors is audible two seats away. Turn it down or use a sealed pair.

How to leak less with any pair

1. Seat the pod correctly. The speaker opening should point into the canal, not at your cheek. On a hook, rotate the pod down and back until it sits in front of the opening; on a clip, seat it low on the rim. A pod that's aimed wrong leaks more and sounds thinner to you, so you turn it up, so it leaks more.
2. Use the EQ. Most leakage is midrange and treble. A slight bass boost and a treble cut in the app makes the pair sound fuller at lower volume.
3. Prefer spoken word in quiet rooms. Podcasts at low volume leak far less than music with cymbals.
4. Turn on the leakage mode if you have one. Sony's LinkBuds Clip has a listening mode that SoundGuys describes as altering the sound “so that people around you have a harder time hearing.”

Designs that do more of the work

• Shokz DirectPitch (OpenFit line, OpenDots): directional drivers aimed at the canal, which Shokz designed specifically to cut what reaches the person next to you.
• Shokz OpenFit Pro: adds an open-ear noise-reduction mode that lowers what reaches your ear, which lets you run the volume lower for the same perceived level. Battery halves when it's on.
• Sony LinkBuds Clip: the one pick with a dedicated leakage-protection mode.
• Bone conduction at moderate volume: no speaker pointed at open air. The Shokz OpenRun Pro 2 is the pick if the neckband suits you.

Picks