Bose QuietComfort Ultra Earbuds Review: Still the Quietest
The second generation adds battery, a newer wireless stack and much better call handling. The fundamental trade is unchanged: the best cancellation in an earbud, not the best sound.
Bose has one clear identity in audio, and it is not sound quality. It is silence. For twenty-odd years the company’s real product has been the absence of the world around you, and the QuietComfort Ultra Earbuds are the most concentrated version of that idea it has ever shipped — the whole noise-cancelling apparatus of a full-size headphone, squeezed into something that disappears into a coat pocket.
The second generation is not a reinvention. It is a tidying-up: better battery, a newer wireless stack, sharper call handling. Whether that is worth your money depends almost entirely on one question, which is what this review is really about — do you want the quietest earbuds available, or the best-sounding ones? Because those are still not the same product.
Why noise cancellation in earbuds is genuinely hard
It is worth understanding why over-ear headphones have always cancelled better, because it explains everything about how these feel.
Cancellation works in two layers. The first is passive: physical material blocking sound before any electronics get involved. An over-ear cup has a large sealed volume and a lot of foam. An earbud has a silicone tip the size of a pea. The second layer is active: microphones listen to what leaks through and the processor generates an inverted waveform to cancel it.
Earbuds start with far less passive isolation, so the active layer has to work much harder, in a much smaller space, with much less power. That Bose gets earbuds to within touching distance of good over-ear cancellation is the actual achievement here, and it is the reason people forgive the other compromises.
The single biggest variable is the tip. More complaints about weak cancellation come down to a bad seal than to anything else. Bose ships multiple tip and stability band sizes and the app has a fit test. Run it. A one-size-up tip changes the result more than any firmware update ever will.
What changed in the second generation
Four things, in rough order of how much you will notice them.
Battery. The buds are now rated at up to six hours. Reviewers testing with Immersive Audio and full cancellation running measured a little over five, which is the number to plan around, since that is how most people actually use them. Total runtime including the case sits around the mid-twenties of hours, and lighter settings push it higher — independent measurements vary here more than Bose’s own figure suggests, so treat the case total as a range rather than a promise.
Wireless stack. A newer Bluetooth version with LE Audio support, which brings better power efficiency and lays groundwork for lower-latency and broadcast features. Day to day this shows up as a slightly more stable connection rather than anything dramatic.
Call handling. Bose’s SpeechClarity processing does a noticeably better job of isolating your voice from what is happening around you. This was the weakest part of the first generation and it is meaningfully improved.
Codec support. aptX Adaptive alongside AAC and SBC, which matters if you are on an Android phone that supports it and does not matter at all if you are on an iPhone.
Immersive Audio, and whether to leave it on
Bose’s spatial mode takes stereo and places it in front of you rather than inside your head, optionally locking that position so the sound stays put when you turn. It is the most polarising feature on the product.
It genuinely works — the effect of music appearing to come from a point in the room is convincing, and for film and long listening sessions it reduces the slightly claustrophobic feeling that earbuds can produce. But it costs battery, it softens the immediacy of well-produced music, and on some tracks it introduces a hollow quality in the midrange.
The reasonable position: leave it on for video, podcasts and background listening. Turn it off when you are actually paying attention to music. Treat it as a mode, not a setting.
Sound, honestly
These are tuned the way Bose has always tuned things — smooth, warm, generous in the low end, slightly softened at the top. It is an extremely easy listen and it flatters almost everything. It is also not neutral, and if you are used to studio-monitor tuning you will find the treble polite to the point of reticence.
There is an EQ in the app and it moves the needle further than most people expect. If your first reaction is that the bass is heavy, five minutes there will change your mind about the product.
How they compare
| Model | Strongest at | Weakest at | Choose it if |
|---|---|---|---|
| Bose QC Ultra Earbuds | Cancellation, comfort, spatial audio | Battery per charge, neutral sound | Silence is the reason you are buying |
| AirPods Pro 3 | Apple integration, switching, features | Less effective on deep drone | You live inside the Apple ecosystem |
| Sony WH-1000XM6 | Overall cancellation, battery, calls | Bulk — it is an over-ear | You will accept a bag rather than a pocket |
| Sony WF-1000XM5 | Sound quality, app control | Fit consistency | You want detail more than silence |
The honest summary of that table: if you want the quietest earbuds, buy the Bose. If you want the best-sounding ones, do not. If you want the quietest anything, buy the over-ear and carry a bag.
What it does well
- The most effective cancellation available in an in-ear format
- Comfortable enough for genuinely long sessions
- Immersive Audio is a real feature, not a gimmick
- Call clarity substantially improved over the first generation
- Wireless charging and multipoint both included
What to think about first
- Around five hours real-world with everything switched on
- Warm tuning that is not to every taste out of the box
- IPX4 — fine for sweat and drizzle, not for swimming
- Immersive Audio costs battery and some clarity
- Premium pricing in a fiercely competitive category
Who these are for
Frequent flyers and commuters. The category these were designed for and the one where nothing beats them at this size. Aircraft drone is the exact frequency profile cancellation handles best.
People in loud shared spaces who cannot wear over-ears — hot offices, warehouses, anywhere a headband is impractical.
Anyone who has bounced off earbuds on comfort. Bose’s fit system is the most accommodating in the category, and if other buds have hurt after an hour these are the ones to try.
They are a weaker choice if you mostly listen at a desk, where an over-ear is cheaper and better, or if you want analytical sound, where several rivals win outright.
Check the current price
Earbud pricing moves constantly and this model discounts heavily around sale events, so a figure quoted today will be wrong soon. Check it live. The link goes to the second-generation model reviewed here; the first generation is often available for noticeably less if the newer features do not matter to you.
See the Bose QuietComfort Ultra Earbuds →
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Frequently asked questions
Is the second generation worth upgrading to from the first?
How long do they last on one charge in practice?
Can I use them for running or the gym?
Do they connect to two devices at once?
Do they cancel voices as well as engine noise?
Are they better than the over-ear QuietComfort Ultra Headphones?
The verdict
Still the earbuds to buy if the point is silence. The second generation fixes calls and adds enough battery to matter, without changing the fundamental trade: exceptional cancellation and comfort, in exchange for warm rather than accurate sound and a modest five-ish hours with everything running. Frequent travellers should stop reading and buy them. Music-first listeners should look at Sony instead.
Sources and method
Specifications are Bose’s published figures. Real-world battery and cancellation behaviour reflect consistent findings across independent reviews, including measured runtimes that fall short of the rated figure under Immersive Audio. Reviewers disagree on total case runtime and on the exact Bluetooth revision, and we have deliberately given ranges rather than picking the most flattering number. We have not tested this product ourselves and do not claim to have.