Bose QC Ultra Earbuds Gen 2 Review

I think the Bose QC Ultra Earbuds Gen 2 answer a pretty specific question: do you want a premium noise-cancelling earbud that is technically sophisticated, comfortable enough for everyday use, and tuned for a vivid, bass-and-treble-forward presentation? If yes, these make a lot of sense. If not, the limitations show up fast.

People already know Bose for noise cancelling, and fair enough, that reputation is not an accident. But I think the bigger story here is CustomTune, because Bose has come with a rather elegant solution to the core problem of high acoustic impedance devices, like in-ear headphones, which is variability. Ear anatomy changes what you hear, especially with in-ear devices. That means tuning in-ear headphones and closed back headphones is inherently an exercise in aiming at a moving target that depends on the anatomy of the individual listener. Now, while Bose deserves credit for taking that seriously, the issue is that solving variability does not automatically mean the final tuning is something everyone will love. So while they've appropriately identified it as a problem, that doesn't mean they're necessarily correcting it to the right outcome.

Price and package

The QC Ultra Earbuds Gen 2 are $299 on Bose’s website. The case is attractive and feels solid, and the buds fit securely in it. I can turn the case upside down or shake it and they do not fall out, which is nice, although that secure fit does make them a little annoying to remove. The case is also a bit on the large side, so I would call it backpack-friendly more than pocket-friendly.

So yes, it's a good case but slightly awkward.

Fit and comfort

The fit is one of the more important caveats. Bose uses contoured outer inserts in different sizes to help lock the earbuds in place, and that matters because the actual insertion is fairly shallow. The secure-fit pieces are doing real work here and it's mostly effective.

For me, the fit was reasonable. They stayed in place, and I did not have problems with them falling out during normal movement. But a shallow fit is still a shallow fit, and if you are someone who prefers deeper-fitting earbuds, or if these outer support pieces do not match your ear shape, that is going to matter. Bose has done a decent job with the system, just not a miraculous one.

Battery and charging

Bose claims up to 6 hours of continuous playback on a charge, and up to 24 hours total with the case. There is also fast charging, with 10 minutes in the case claimed to provide about an hour of playback, and the case supports wireless charging.

The downside is that the battery is not replaceable. I think that is a shame, especially as this is becoming a more relevant issue in portable electronics.

Transparency mode and ANC

Transparency mode is pretty decent. I would not call it exceptional for realism or clarity, because it still does not make the outside world sound especially open or natural, and your own voice still sounds like it is coming through earbuds in your ears. That part is normal enough.

What Bose does well is keep transparency stable when you are moving around. A lot of earbuds behave a bit weirdly when they shift during walks, which can make transparency inconsistent or make your own voice sound off in strange ways. I did not run into that here, and that made these more usable than some other high-end true wireless options for walks and hikes.

ANC is also quite good, which is what you would expect from Bose. I do not think that is the most interesting part of the product, though. It works, it is competitive, and most people will be satisfied with it. The more distinctive part is the sound personalization.

Sound quality

These are unapologetically V-shaped. There is a lot of bass, a lot of treble, and less emphasis on the mids than I would want for a more natural or balanced presentation. That does not automatically make them bad, and in fact I think this is one of the better executions of this kind of tuning in a true wireless earbud.

But it is still exactly the kind of sound that tends to wow people at first and then wear them down if they want something more relaxed or more honest over time. If you want a smoother, more neutral signature, these are not doing that for you out of the box.

The good news is that the bass itself is very good. Once you pull it down a bit with EQ, the low end is impactful, tight, and nimble. Bose placed the bass shelf intelligently, which helps a lot. The mids are better than the stock tuning first suggests, too. They are not the problem. The problem is that the default bass-and-treble lift tends to overshadow them.

Treble is the trickier part. I still hear too much upper-treble energy, that airy, shimmery extra bite that can make the presentation exciting and percussive, but also keeps it from settling into something more natural. It is not especially harsh or sibilant, which is good, but it still pushes the sound toward vividness over realism.

CustomTune

This is the part most people miss about Bose, and honestly, it is the most interesting thing here.

With in-ear headphones, ear anatomy matters a lot. Canal size and shape change where resonances land, and those resonances have a big effect on timbre and tonal correctness. So tuning these products is not as simple as drawing a pretty target curve and calling it a day, because the response shifts from person to person in ways that can be pretty dramatic.

CustomTune is Bose’s answer to that. When you insert the earbuds, they play a chime, and that tone is used to snapshot the canal response. Inward-facing microphones read that information and the earbuds compensate accordingly. The stated goal is to make the response more consistent higher up in frequency, not just in the lows.

That is smart. More than smart, really. I think it is one of the more sophisticated things being done in mainstream wireless audio.

But here is the catch: solving variability does not mean the final target is automatically the one you want. A personalized correction to a tuning you do not like is still a tuning you do not like. Audio, as annoying as this may be for marketing departments, still has to sound good.

Why the EQ matters

This is where I think Bose left a lot on the table. The app gives you useful adjustment points for bass and treble, and those controls are sensibly placed. The bass adjustment in particular is genuinely effective.

But there are not enough filters to make these as flexible as they should be. A feature around roughly 2.5 kHz remains noticeable, and once you start turning down the bass and treble, that region becomes harder to ignore. Since Bose is already doing a lot of the heavy lifting with CustomTune, the obvious next step would have been more complete EQ control.

The point being, CustomTune solves a big part of the consistency problem, but not all of it. And when the remaining issues are in the treble, the thing you want is better EQ. Bose did not give these parametric EQ, and in my view that is the main reason they land as good rather than great.

If Bose had added parametric EQ here, I think these could have been much easier to recommend broadly. As they stand, they are still somewhat locked into their intended personality.

Reviewer impressions

I also had a chance to let a few other headphone reviewers hear them, and the broader reaction lined up pretty closely with my own take. People kept landing on the same basic points: the ANC is good, the bass quality is good, the mids are better than expected, and the treble has extra sparkle without necessarily turning harsh. There were also repeated comments about a dip through the mids or upper-mid transition, and about the bass being too much until it is reduced with EQ.

That tells me this is not just me being overly picky about the sound. The tuning profile is obvious in actual listening, even if different people focus on slightly different parts of it.

Comparisons

Against the Bose QC Ultra over-ear, these earbuds are less versatile. The over-ear model is easier to recommend across different preferences because its implementation and EQ flexibility work better for both balanced listening and more fun, exaggerated tuning. These earbuds are more specialized.

Against the AirPods Pro 2, the Bose are more technologically sophisticated in the way they address fit-related acoustic variability, but I would not call them the better choice if what you want is a smooth, natural, balanced tonality. That is still where the AirPods Pro 2 have an advantage.

Against the AirPods Pro 3, I would take the Bose. They are still V-shaped, but they were described as less punishing in the treble.

Against the Sony WF-1000XM6, I would take the Bose pretty clearly. The issue is not just EQ band count, it is that Sony does not have anything like CustomTune and, in this comparison, the Bose come out ahead on sound quality overall.

Verdict

I think the Bose QC Ultra Earbuds Gen 2 are very good earbuds for a particular listener, not great earbuds for everyone. Their strengths are real: good ANC, usable transparency mode, a stable everyday experience, excellent bass quality once adjusted, solid mids under the stock tuning, and a genuinely sophisticated personalization system in CustomTune.

The problem is that Bose paired all of that with a tuning that is still firmly V-shaped and an EQ system that does not let you fully escape it. So if you like vivid, punchy, bassy, treble-forward sound, these make a lot of sense. If you want natural, smooth, balanced sound, or if you are the kind of person who wants to precisely personalize a premium earbud, these stop short of what they could have been.

My view is simple: recommended, but with a pretty specific warning label. Buy them for the tech, the usability, and the energetic tuning. Do not buy them expecting a neutral all-rounder, because that is not what Bose made here.