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Bose QuietComfort.
Bluetooth Noise Cancelling Earbuds with Spatial Audio
The New King of Quiet?
In the fiercely competitive world of wireless earbuds, Bose has long been the undisputed champion of one crucial feature: Active Noise Cancellation (ANC). With the QuietComfort Ultra Earbuds, they’ve not only doubled down on this strength but also introduced a revolutionary new feature, “Immersive Audio,” to challenge rivals on the sound quality front. We’ve put these buds through their paces to see if they live up to the hype and if they’re a worthy investment for your daily tech trek.

Design & Comfort: A Familiar, Secure Fit
At first glance, the QC Ultra Earbuds look very similar to their predecessors, the QuietComfort Earbuds II. They retain the signature, slightly chunky design with a stability band (or “concha fin”) and an oval-shaped ear tip. While they’re not as minimalist as some competitors, this design is what makes them so comfortable and secure. The included “Fit Kit” with three sizes of both ear tips and stability bands allows for a highly personalized fit. We found that taking the time to find the right combination creates a fantastic seal, which is critical for both sound quality and ANC performance. For daily commuting and office work, they are incredibly comfortable, though some may find them a bit too bulky for intense workouts. They are, however, IPX4 sweat and water-resistant.
Connectivity & Battery:
The QC Ultra Earbuds feature Bluetooth 5.3 and, thanks to a software update, now support multipoint connectivity, a crucial feature that was missing at launch. This allows you to seamlessly switch between two devices, like your laptop and your phone. Battery life is rated at up to 6 hours on a single charge (without Immersive Audio), with an additional 18 hours from the charging case for a total of 24 hours. The case itself now includes the long-awaited wireless charging capability, a welcome upgrade that brings them in line with top competitors.

Performance & Features:
- Noise Cancellation (ANC): The Unbeatable Standard
- Bose’s ANC technology remains in a class of its own. The QuietComfort Ultra Earbuds are, without a doubt, the best noise-cancelling earbuds on the market. They don’t just reduce background noise; they create an eerie, almost-silent vacuum. From the rumble of a bus engine to the chatter of a crowded coffee shop, these buds effectively nullify distractions, allowing you to fully immerse yourself in your audio. The CustomTune technology is a subtle but effective feature, automatically calibrating the ANC and sound to your unique ear shape for a personalized experience.
- Sound Quality: Rich, Balanced, and Punchy Bose has historically been known for a warmer sound profile, and the QC Ultra Earbuds deliver a rich and detailed audio experience. The bass is deep and resonant without being overpowering, the mids are clean, and the highs are crisp and clear. The overall sound is balanced and adaptable, making it suitable for a wide range of music genres. While they may not be as clinically “flat” as some audiophile-focused buds, the sound is a pure joy to listen to.


- Immersive Audio: A Game-Changer? This is the star feature and a significant departure for Bose. “Immersive Audio” is their take on spatial audio with head tracking. In “Still” mode, the audio is spatialized and seems to come from a point directly in front of you, creating a wider, more open soundstage that makes music feel more expansive. In “Motion” mode, the sound stays fixed in place as you turn your head, a neat effect for watching movies or for those who want a more dynamic sound experience. It’s an impressive technology that works better here than in many other implementations, though it can feel a bit unnatural on certain tracks. Be aware that using this feature significantly impacts battery life.
- Call Quality: Clear and Reliable Thanks to improved microphones and an AI-powered noise suppression system, call quality is excellent. The earbuds effectively isolate your voice from background noise, making your calls crystal clear even in noisy environments. We found that the person on the other end of the line had no trouble hearing us, even when we were near traffic.


The Verdict for Tech Trek Reviews
The Bose QuietComfort Ultra Earbuds are a triumphant return to form for Bose. They solidify their position as the undisputed leader in noise cancellation, a feature that is truly a productivity and tranquility game-changer. The new Immersive Audio feature is a promising innovation that adds a new dimension to listening, and the inclusion of wireless charging and multipoint connectivity addresses key user complaints from the previous model.
While they carry a premium price tag, for anyone who prioritizes world-class noise cancellation and a rich, immersive sound experience, the QuietComfort Ultra Earbuds are an easy recommendation. They are a near-perfect blend of technological prowess and user-focused design, making them an essential gadget for any tech enthusiast on the move.
Final Score: 9.5/10


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