Bose QuietComfort Earbuds II

They Measure Your Ear

Cancellation depends on knowing what the microphones are hearing relative to what reaches the eardrum, and that relationship differs with every ear canal and every seal. Most earbuds apply a generic profile and accept the error.

These play a brief tone on insertion, measure the response of your specific ear, and calibrate the cancellation to it. It is a genuine engineering answer to the main reason in-ear cancellation underperforms.

The result is cancellation that is, in practice, among the most effective available in an earbud, and the measurement step is why rather than incidental to it.

Fit System And Stability

They use separate ear tips and stability bands rather than a single tip, which allows seal and retention to be optimised independently — a tip that seals well may not hold well, and treating them separately is more effective than a compromise.

That gives more fit combinations than a conventional set of tips, which matters because ear shape is the dominant variable in earbud performance.

They are physically larger than some rivals and protrude more, which some find uncomfortable to sleep in or lie on and is worth knowing if that matters to you.

Transparency And Sound

Transparency is very good, consistent with Bose's general strength there — natural enough to converse through rather than merely usable.

The tuning is warm and full rather than neutral, which suits noisy environments where residual noise masks fine detail. Anyone wanting analytical sound should be looking at wired earphones instead.

Codec support is more limited than some rivals, which matters only if your phone supports the codecs in question and you can hear the difference in a noisy environment, which in practice is rarely.

Practicalities

Battery life is adequate rather than long, and reduces with cancellation active as it does on every earbud.

The case is larger than some competitors, which along with the bud size makes the whole package bulkier in a pocket.

As with all true wireless earbuds, the batteries in both buds and case degrade and cannot be replaced, which makes them a three-to-four year product.

Against The Alternatives

Against Sony's flagship earbuds, the two are close on cancellation with Bose calibrating per ear; Sony offers deeper app control and a smaller package.

Against AirPods Pro, Bose cancels comparably or better and loses all Apple ecosystem integration.

Against deep-insertion wired earphones, those isolate more passively across all frequencies with no battery, and offer no convenience.

The Verdict

Among the most effective cancelling earbuds available, and the per-ear calibration is a genuine engineering answer to why in-ear cancellation usually underperforms.

They are physically larger than rivals, the case is bulky, battery life is adequate rather than long, and the tuning is warm rather than neutral.

The fit system with separate tips and bands is worth spending time on — cancellation quality here depends on it more than on any setting.

One consequence of the calibration is worth anticipating: because it measures on each insertion, a bud seated differently produces a different result, and the cancellation can vary noticeably between sessions if your insertion technique is inconsistent. Seating them the same way each time is what makes the performance repeatable, and it is the reason two people report very different results from identical earbuds.