Gear: Suunto Sonic bone conduction headphones

First entry in a gear category. The format is deliberate: specifications, then what the physics of the delivery path allows, then a personal impression kept separate from both.

Specifications

Checked 2026-08-27.

Path	Bone conduction, open ear
Chip / Bluetooth	Qualcomm QCC3044, Bluetooth 5.2, multipoint
Codec	aptX Adaptive
Stated frequency range	20 Hz – 20 kHz
Microphones	Dual, with cVc echo cancelling and noise suppression
Battery	140 mAh, 10 h playtime; 5 min charge ≈ 90 min use; full charge ≈ 1 h
Weight	30.6 g
Materials	Titanium alloy and silicone
Ingress	IP55
Price	$149 USD at launch; $79 on the Suunto US store when checked

One correction worth making, because it is easy to repeat. “Dual” refers to the microphones, not the transducers. Every listing I checked says “Built-in Dual Mics”. Two bone transducers, one per side, is the standard arrangement for any stereo bone-conduction headset and is not a distinguishing feature.

The property that decides everything else

A sealed transducer at one ear gives roughly 40–60 dB of interaural attenuation — the signal arriving at the far ear is far quieter than at the near one, which is what makes two ears independent. A transducer on the skull gives close to none. The skull couples both cochleae, so a bone-conducted signal arrives at both at once.

This is not a shortcoming of this product. It is what bone conduction is.

It has a hard consequence for the work I do. My rulebase returns a laterality of undefined — not “left”, not “bilateral-ish” — for any delivery path with under 15 dB of interaural attenuation. A path that cannot deliver a left-ear stimulus must not have downstream predictions made as though it did.

So, for this device:

protocol	usable
Isochronic tones, AM envelopes, any shared signal	yes
Binaural beats	no
Interaural time differences, dichotic drive	no
Anything reporting a per-ear result	no

Two further limits, neither disqualifying. The 20 Hz – 20 kHz figure is an air-conduction-style specification and I have not verified it as delivered through bone on a head — for evoked-potential work the delivered envelope is what matters, and it is unmeasured. And the nearest measured air-versus-bone separation I have is 22 dB, from tuning-fork work on a different transducer for a different purpose.

First impression

Mine, one person, one session, unblinded. Not evidence, and the tier on this post reflects that.

The headphones were extremely easy to get set up, and this is the first time that I’ve used bone conduction headphones, so it truly blew my mind experiencing them. I couldn’t believe how high resolution they were, even though it’s not even sound directly through the ears. Still trying to wrap my head around it. But regardless, this is a great buy.

Also, just as a side note, it’s a really great way to have audio-evoked potentials or something like Brain.fm running during family time so that my ears aren’t covered, and I’m more aware and more present, but can still be running a therapeutic music solution.

That last point is the one I would actually defend, and it is about compliance rather than acoustics: a protocol that can run while you are present with your family is a protocol that gets run. Nothing here measures whether the delivered signal is adequate for the purpose — only that the barrier to wearing it is much lower.