Bose QuietComfort Ultra Earbuds (2nd Gen): A Closer Look at Bose’s Flagship Wireless Earbuds

Bose has long been a recognizable name in personal audio, and the QuietComfort Ultra Earbuds (2nd Gen) represent the company’s current flagship entry in the true wireless noise cancelling category. This second-generation model builds on the QuietComfort Ultra line with a set of features aimed at listeners who want strong noise cancellation, adaptable sound, and flexible connectivity in a single pair of earbuds. The black finish keeps things understated, while the feature set covers everything from spatial audio to wireless charging.

This review walks through what Bose states about the QuietComfort Ultra Earbuds (2nd Gen), what each feature is designed to do, and who might find the package appealing. Everything here is based on the manufacturer’s stated information rather than hands-on testing.

Design and Fit

Bose approaches fit with a modular system rather than a one-size-fits-all solution. The earbuds ship with nine combinations of eartips and stability bands, giving users room to experiment until they find a configuration that works for their ears. The eartips are described as soft and umbrella-shaped, designed to seal the opening of the ear and reduce outside noise. The stability bands, meanwhile, are intended to hug the earbuds in place.

That two-part approach matters because in-ear fit affects both comfort and how well passive noise isolation works. A proper seal from the eartips can help block some ambient sound before active noise cancellation even kicks in, while the stability bands address the physical security of the earbuds during movement. Bose describes the goal as a snug, comfortable fit, though the actual result will depend on how each user’s ears match the available combinations.

The earbuds carry an IPX4 rating, which indicates resistance to water splashes. That rating is worth noting for anyone who wants to wear them during workouts or in light rain, though IPX4 is not a claim of full waterproofing.

Noise Cancellation and CustomTune Technology

Noise cancellation is the headline feature here. Bose states that the QuietComfort Ultra Earbuds (2nd Gen) offer the best noise cancellation of any Bose wireless earbuds, and that it is now even better than before. That is a manufacturer claim rather than an independently verified result, but it signals where Bose positions this model in its lineup.

Two technologies support the noise cancellation experience. ActiveSense technology is designed to smooth spikes in surrounding sound, so that even in Aware Mode, sudden noises are less likely to intrude. Aware Mode, for those unfamiliar with the term, is the transparency setting that lets outside sound in deliberately. ActiveSense aims to make that mode more comfortable by softening abrupt changes in ambient noise.

CustomTune technology takes a different angle. It analyses the user’s ears and adapts the earbuds to their shape. According to Bose, the result is world-class noise cancellation and custom sound. Because ear canal geometry varies from person to person, this kind of personalization is intended to tune both the noise cancellation and the audio output to the individual listener.

Bose also notes that noise cancellation levels can be adjusted quickly without using Modes, including turning noise cancellation off entirely to conserve battery. That gives users a straightforward way to manage how much power the feature draws.

Immersive Audio and Cinema Mode

Bose Immersive Audio is a spatial audio feature that takes what you are hearing out of your head and places it beyond the earbuds. Bose describes the effect as listening from the acoustic sweet spot, where songs sound the way the artist intended. Whether that description matches a given listener’s preference is subjective, but the intent is to create a more enveloping sense of space rather than a strictly in-head presentation.

Cinema Mode extends that idea to video content. It spatializes audio while balancing background sounds and sound effects, with the goal of delivering a theater-like experience through the earbuds. For anyone who watches a lot of video on a phone, tablet, or laptop, this mode is designed specifically for that use case.

It is worth noting that Immersive Audio affects battery life, which Bose addresses directly in its battery estimates.

Call Quality and Microphone Performance

Bose describes the call quality on these earbuds as its best, with SpeechClarity technology using noise-rejecting microphones to filter out background noise and wind while focusing on the user’s voice. That is a stated claim about the microphone system rather than a measured result.

Flexibility is part of the calling experience as well. Calls can be taken with both earbuds or with a single earbud, which is useful for anyone who prefers to keep one ear open to their surroundings during a conversation.

Battery, Charging, and Connectivity

Battery life is rated at up to 6 hours in Quiet or Aware Mode, dropping to up to 4 hours when Immersive Audio is active. The charging case holds up to three full charges, extending total listening time between trips to a power source. Bose notes that the case now supports wireless charging in addition to USB-C, so users can choose between a cable or a wireless charging pad.

On the connectivity side, Bluetooth multipoint allows the earbuds to switch between devices such as a phone, a laptop, and others without needing to disconnect and reconnect manually. That is a practical convenience for anyone who moves between work and personal devices throughout the day.

The Bose app is also part of the package. Downloading it provides access to software updates, which Bose says help ensure optimal functionality and access to the latest features. As with many modern earbuds, keeping the firmware current may matter for getting the most out of the product over time.

Who Are These Earbuds Best For?

Based on the stated features, the QuietComfort Ultra Earbuds (2nd Gen) suit several specific types of users:

• Frequent travelers and commuters who want strong active noise cancellation and the ability to adjust it quickly, including turning it off to save battery.
• Listeners who value spatial audio and want both a music-focused Immersive Audio mode and a video-oriented Cinema Mode.
• People who juggle multiple devices, since Bluetooth multipoint supports switching between a phone, laptop, and other Bluetooth sources.
• Users who take a lot of calls, particularly those who want the option of single-earbud calling and noise-rejecting microphones.
• Anyone who has struggled to get a secure fit with other earbuds, given the nine eartip and stability band combinations.

Those who prioritize a fully waterproof design should note that the IPX4 rating covers splashes rather than submersion. Similarly, listeners who want maximum battery life per charge may want to weigh the difference between the 6-hour and 4-hour estimates depending on whether Immersive Audio is in use.

Final Verdict

The Bose QuietComfort Ultra Earbuds (2nd Gen) bring together several of Bose’s current technologies in one package: ActiveSense for smoothing ambient sound spikes, CustomTune for ear-based personalization, Immersive Audio and Cinema Mode for spatial listening, and SpeechClarity for calls. The wireless charging case, Bluetooth multipoint, and IPX4 rating round out a feature set that covers everyday listening, travel, and video viewing.

Battery life is rated at up to 6 hours in Quiet or Aware Mode and up to 4 hours with Immersive Audio, with the case providing up to three additional full charges. The nine fit combinations give users meaningful flexibility in dialing in comfort and seal.

For anyone drawn to Bose’s approach to noise cancellation and spatial audio, this second-generation model represents the company’s current take on the true wireless earbud formula. The feature list is broad, the fit system is adaptable, and the connectivity options are practical. Whether it is the right choice depends on how much weight a buyer places on each of those elements.