Bose QuietComfort Ultra Earbuds Truly Wireless Headphones Review

The Bose QuietComfort Ultra Earbuds have kept the same sleek, streamlined look of the Bose QuietComfort Earbuds II Truly Wireless. These buds have a stem design and feature the manufacturer's logo embossed on the glossy exterior. As with the previous gen, the stability fins and ear tips are part of a swappable design that makes it easy to try out different fits. They come in three color variants: 'Black', 'White Smoke', and 'Moonstone Blue'.

These earbuds are very comfortable. Their ergonomic design ensures that the tips can create a good seal without going deep into your ear canal. The included selection of silicone ear tips makes it easy to achieve a comfortable fit, and the variety of stability fins provided allows you to find a set that feels snug and stable. The form factor of these buds does mean that they stick out of your ear slightly, and their fit can loosen if they get snagged on something or if you're lying down on your side.

These buds have good controls. You can tap the touch-sensitive surface on either bud to activate functions, and they have a nice responsiveness. However, it's easy to accidentally tap them while placing them in your ears. There's also no audio feedback to let you know when you've successfully registered a command, except for switching ANC modes and a max/min volume warning.

On either bud:

• Single tap: Plays and pauses audio. Also accepts calls.
• Double tap: Skips to the next track. Also ends calls.
• Triple tap: Skips to the previous track.
• Touch and hold: By default, this cycles between ANC modes: 'Quiet', which is ANC on, and 'Aware', which is a talk-through mode, so that you can hear your environment without taking your earbuds out. You can also remap these controls to add a shortcut of your choice.
• Swipe up: Raises the volume.
• Swipe down: Lowers the volume.

Like most wireless in-ears, they have a very portable design, which you can slip into bags or pockets while taking up minimal space. Their case is also small enough to fit into bags or coat pockets.

The Bose QuietComfort Ultra Earbuds come with a good carrying case. It's made of hard plastic with a matte coating that feels smooth. The lid is magnetically secured, but it's made of hollow plastic that's not as sturdy as the rest of the case. There's also an LED power indicator to let you know the buds are charging. Sadly, this case doesn't feature wireless charging, which has been missing since the Bose QuietComfort Earbuds Truly Wireless.

These earbuds have a good build quality that aligns with their predecessor, the Bose QuietComfort Earbuds II Truly Wireless. The buds are made of plastic with a metal strip on the stem that houses the touch-sensitive control surface. They're also certified IPX4 for resistance against splashes of water. The case feels decently sturdy despite its plastic construction. However, the case lid feels flimsier than the rest of the case, which detracts from the overall build quality. The silicone ear tips are also made of a soft, pliable material that may tear if you're not careful with them.

These buds have a very stable in-ear fit thanks to their stability fin design. There are nine different fin and ear tip combinations, so you can find a stable fit for your ear shape. You can wear them during workouts, and they won't fall out of your ears.

• Bose QuietComfort Ultra earbuds
• 3x stability fins
• 3x ear tips
• USB-A to USB-C charging cable
• Carrying case
• Manual

The Bose QuietComfort Ultra Earbuds have a bass-heavy sound signature similar to their predecessor, the Bose QuietComfort Earbuds II Truly Wireless. The overemphasized bass response is great for genres like electronic music and hip-hop, as there's plenty of boom and punch on tap. The slightly tilted response across the upper-mid and treble ranges emphasizes the detail of vocals and lead instruments, while sibilants, like cymbals, sound bright and present. If you prefer a different sound profile, the companion app offers a graphic EQ and presets that let you tweak the sound to your preferences.

Users contacted us regarding a high noise floor while the ANC was on, resulting in 'coil-like' sounds and beeps. While subjectively listening to the buds for a while with ANC on, we could also hear this kind of noise from our unit at random times, mostly from the left earbud. These buds also have a somewhat high noise floor, meaning the headphones generate quite a bit of their own sound. If you've experienced this issue, please inform us in the forums.

These Bose QuietComfort Ultra Earbuds have great frequency response consistency. The manufacturer has implemented their CustomTune technology with these earbuds. This technology analyzes your ears and adjusts the ANC and sound profile over repeated uses. The manufacturer claims they'll adapt to your ears, listening environment, and musical preferences over time to optimize their performance. This means that the frequency response between listening sessions is slightly inconsistent compared to previous QuietComfort iterations, as the earbuds slightly re-tune the ANC and sound profile every time you use them. As a result, you might find it easier to get a more consistent sound after a few listening sessions.

The bass accuracy is excellent. The response is overemphasized across the lowest bass frequencies, which results in boomy sub-bass reproduction and kicks with plenty of slam. On tracks like Young Thug's Wyclef Jean, the subby bassline has plenty of rumble and punch, which complements the track's paired-down production.

These buds have impressive mid accuracy. They generally follow our target curve quite well, but there's a dip in the mid to high-mid that nudges vocals and instruments to the back of the mix. This is particularly noticeable in bass-heavy tracks, where prominent drums and basslines often overshadow vocals and lead instruments. In songs like Mitski's I Love Me After You, the boomy, reverb-drenched kicks in the intro make the lead vocal and piano sound distant and less clear.

The treble accuracy is great. The overall response is slightly tilted but quite neutral across the entire range. There are also some peaks and dips across the range. Sibilants, like cymbals, sound bright and present, while the peak in the low-treble, in particular, makes vocals and instruments sound detailed and exciting.

These earbuds have a decent peaks and dips performance. There's a peak in the low-bass, which adds plenty of rumble to your mixes. A dip in the mid-mid affects the left driver more noticeably than the right, pushing instruments and vocals a little further back in the mix. There's a peak between the high-mid and low-treble range that makes the harmonics of vocals and instruments harsh and another peak in the mid-treble that makes sibilants, like S and T sounds, piercing.

The imaging performance is outstanding. Bose has demonstrated consistent quality control and ergonomics across their previous products, and the Bose QuietComfort Ultra Earbuds indicate this. Our unit's L/R drivers are well-matched in group delay, phase, amplitude, and frequency response. While the group delay falls slightly above audible levels in the low-bass, making low frequencies sound a touch loose, this is only noticeable if you intentionally listen for it in bass-centric genres like EDM and hip-hop. There's also a slight bump in our unit's phase response between the low and high-mid, which is difficult to hear in real-life audio content. However, imaging tends to vary across units.

The Bose QuietComfort Ultra Earbuds have a bad passive soundstage performance, which is normal for in-ears. Their design bypasses your outer ear, which needs to be activated by sound to create an out-of-head soundstage. As a result, sound seems to come from inside your head rather than from speakers placed around you.

Like the Bose QuietComfort Ultra Headphones Wireless, these buds feature Immersive Audio technology that you can use in either 'Still' or 'Motion' mode. 'Still' places the virtual speakers in front of you and tracks your head to ensure sound comes from the original direction of the audio. If you swivel your head to the left, the audio will seem like it's playing to your right. By contrast, the 'Motion' mode tracks your head to ensure that these virtual speakers stay positioned in front of you at all times. However, this feature can't be described as true virtual surround sound as these buds lack the processing capabilities for multi-output surround sound content like Dolby Atmos. Instead, they use Digital Signal Processing (DSP) to virtually model a wider stereo soundstage.

The weighted harmonic distortion performance is very good. Although there are a few spikes in the treble range, these can be difficult to hear in real-life content unless you intentionally listen out for them. Other frequencies fall within good levels, resulting in clean and pure audio reproduction.

These are the settings used to test the Bose QuietComfort Ultra Earbuds, and our results are only valid in this configuration.

The Bose QuietComfort Ultra Earbuds have a superb noise isolation performance using the Quiet mode, which is the maximum setting for this feature. They can reduce higher frequency sounds like office chatter and fridge hum very well, but they excel at providing isolation against bass-range noise like low engine rumbles.

Like the Bose QuietComfort Earbuds II Truly Wireless, they use CustomTune technology, which adapts the ANC performance depending on your environment and ear shape, increasing and decreasing attenuation levels across different frequency ranges. As a result, ANC performance can differ across listening sessions, even if you achieve a similar in-ear fit. You can see the difference in ANC performance over different listening sessions here. While our results also indicate that these headphones are marginally outperformed by their predecessor when it comes to noise isolation, this is likely due to limitations in our testing methodology. We checked to see if extending the sweep had an impact on the ANC's ability to dynamically adapt to sound and found that performance improves with longer sweep lengths when seated in the same position, indicating that these buds provide greater attenuation when given some time to adapt to their environment. However, our test rig can't fully account for the adaptive nature of the manufacturer's ANC and CustomTune technologies. Subjectively, it's also very difficult to hear any differences in noise isolation performance between this unit and the QuietComfort Earbuds II, based on everyday use.

The leakage performance is great. Most of the leakage is between the mid to treble range, and escaping audio sounds thin. Even at higher volumes, your audio won't disturb people around you.

The integrated mic's recording quality is okay. The mic is far from your mouth, so your voice lacks body. However, you'll still be understandable to whoever's on the other end.

The mic's noise handling performance is poor. Due to the mic's distance from your mouth, it struggles to separate speech from background noises in busy, noisy environments. Your voice sounds distant and lacking in clarity as a result. However, this won't be an issue if you take calls from a calmer environment, like at home or in a quiet office.

The Bose QC Ultra Earbuds have a decent battery performance. The manufacturer advertises up to six hours of continuous battery life (up to four hours with Immersive Audio enabled), but we measured a little over that. The case also holds an additional three full charges, which can be useful if you need to recharge on the go. There's even a useful power-saving feature that puts the buds on standby mode when you take them out of your ears. It's also possible to use one of the buds while the other charges in the carry case. However, battery life can depend on use.

Bose Music is a great companion app for these earbuds. It allows you to customize your audio experience by using EQ (both a graphic EQ and presets), and you can turn the spatial audio function on/off, as well as toggle between Still and Motion modes to change how head tracking affects your audio. You can adjust the volume, remap controls, and change the Bluetooth source. There's even a handy earbud seal test that can tell you if you've achieved a good fit. Finally, there are plenty of options for adjusting the intensity of the ANC. You can toggle between three ANC modes by default: 'Quiet', 'Aware', and 'Immersion', but you can also create new ANC presets and set custom levels for ANC and immersion levels. Moving the ANC slider doesn't decrease the strength of the ANC; it instead increases the Talk-Through strength relative to the ANC level. Increasing the Talk-Through strength will incorporate more audio from your surroundings, as captured by the built-in mic. You can see a video of the app in use here.

These headphones come with a USB-C to USB-A cable to recharge their carrying case.

The Bose QuietComfort Ultra Earbuds have decent Bluetooth connectivity. They don't support multi-device pairing, so you'll have to disconnect from your phone to pair with your laptop. However, they do support Google Fast Pair, which lets you seamlessly connect to Android devices. They have high PC latency when using their default SBC codec, but they also support aptX Adaptive, which can help lower latency if you're streaming video. Some apps and devices compensate for latency, though.

Some users online have reported connectivity issues with these buds, whereby they would disconnect after a few minutes of playback. We tested them with a few devices but haven't encountered any connectivity issues. If you've experienced any such issues, please let us know in the forums.

These earbuds can connect to Bluetooth-enabled PCs with full audio and mic compatibility. However, there's no other way to connect these headphones to your PC.

The headphones come with a carrying case that charges via a USB-C cable. However, unlike previous QuietComfort models, you can't charge the case wirelessly.