Bose-QuietComfort Ultra Earbuds
Features CustomTune technology and Immersive Audio functionality with industry-leading ANC performance (34dB attenuation below 400Hz, 39dB above 1kHz). Incorporates Snapdragon Sound certification, aptX Adaptive support, and multipoint connectivity. Achieves lightweight 7.1g design with 6-hour battery life. However, excessive frequency emphasis at 30Hz (+14dB) and 2.5kHz deviates from faithful reproduction with artificially tuned sound characteristics.
Overview
The Bose QuietComfort Ultra Earbuds represent Bose’s latest flagship true wireless earbuds. Featuring proprietary CustomTune technology that analyzes individual ear shapes and automatically adjusts sound quality and noise cancellation. Incorporates Immersive Audio technology for spatial sound experience, Snapdragon Sound certification, and Qualcomm aptX Adaptive support. ANC performance achieves industry-leading standards with up to 34dB attenuation below 400Hz and up to 39dB above 1kHz. Despite weighing only 7.1g, includes IPX4 water resistance, multipoint connectivity, and up to 6 hours battery life with high practicality.
Scientific Validity
\[\Large \text{0.8}\]ANC performance demonstrates excellent objective measurements with scientifically verifiable effects: 34dB attenuation below 400Hz and 39dB above 1kHz. CustomTune technology’s ear shape analysis and acoustic adjustment represents a rational approach based on physical acoustic properties. However, measured frequency response shows excessive emphasis at 30Hz (+14dB) and 2.5kHz, representing intentional deviation from neutral reproduction. aptX Adaptive support achieves near-lossless Bluetooth transmission quality, though artificial frequency response adjustments contradict pure fidelity reproduction principles.
Technology Level
\[\Large \text{0.8}\]Implementation includes industry-leading technologies: CustomTune, Immersive Audio processing, Snapdragon Sound certification, and aptX Adaptive support. The hybrid ANC system using internal and external microphones, instantaneous environmental sound analysis and response, and real-time acoustic adjustment demonstrate extremely sophisticated signal processing. Achieving both 7.1g lightweight design and 6-hour battery life, plus IPX4 water resistance and multipoint connectivity, showcases refined implementation technology. However, these advanced technologies don’t necessarily contribute to improved sound fidelity.
Cost-Performance
\[\Large \text{0.8}\]US market price of USD 299 competes appropriately with Sony WF-1000XM5 (USD 160 equivalent to JPY 23,900), Apple AirPods Pro 2 (USD 186 equivalent to JPY 27,698), and Sennheiser MOMENTUM True Wireless 4 (USD 299.95). Considering industry-leading ANC performance, CustomTune technology, and Immersive Audio functionality, the price aligns with technical added value. Particularly, the measured 39dB noise attenuation above 1kHz clearly exceeds competitor performance. Against the lowest-priced Sony WF-1000XM5: CP = 160 ÷ 199 = 0.80, indicating competitive pricing within the premium segment based on equivalent JPY 28,880 pricing.
Reliability & Support
\[\Large \text{0.8}\]Bose brand reliability maintains high industry standards with extensive track record in noise cancellation technology. IPX4 water resistance provides adequate daily use protection, and integrated earwax filters prevent long-term sound quality degradation. Continuous firmware updates including multipoint connectivity addition in July 2024 demonstrate ongoing feature development. However, long-term stability of CustomTune technology and complex signal processing systems remains uncertain due to new technology factors.
Rationality of Design Philosophy
\[\Large \text{0.6}\]CustomTune technology, Immersive Audio processing, and multipoint connectivity represent rational design approaches based on individual technical elements. CustomTune’s personal ear shape analysis and acoustic adjustment particularly follows scientific approaches based on physical acoustic properties. However, intentional frequency emphasis at 30Hz (+14dB) and 2.5kHz deviates from pure faithful reproduction. Immersive Audio functionality prioritizes artificial acoustic effects over natural acoustic space reproduction. While representing rational choices for modern usage environments, compromises exist from an absolute sound quality pursuit perspective.
Advice
This product delivers the highest level of ANC performance and convenience in true wireless format, excelling particularly in noisy environments. CustomTune technology’s personal optimization, multipoint connectivity, and lightweight design offer excellent functionality for modern usage scenarios. The USD 299 price point is reasonable considering the advanced technologies incorporated. However, for pure sound quality pursuit, intentional frequency response adjustments prevent faithful source reproduction. At this price point, wired IEMs offer different acoustic characteristics without Bluetooth compression constraints. Clear recognition of convenience-versus-sound-quality tradeoffs is essential, with recommendation for users prioritizing ANC performance and portability above all else.
(2025.7.6)