Bose QuietComfort 15 vs Bose QuietComfort Ultra Headphones

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QuietComfort 15 compared with QuietComfort Ultra Headphones

	BoseQuietComfort 15	BoseQuietComfort Ultra Headphones
Overview
Released
Released	2009	October 2023
Sound
Type
Type	Over-ear	Over-ear
Noise cancelling
Noise cancelling	Yes	Yes
Transparency mode
Transparency mode	–	Yes
Spatial audio with head tracking
Spatial audio with head tracking	–	Yes
Back
Back	Closed	–
Bluetooth codecs
Bluetooth codecs	None (wired)	SBC, AAC and aptX Adaptive
Lossless over USB-C
Lossless over USB-C	–	No
Noise cancelling detail
Noise cancelling detail	Noise cancellation can be used without the audio cable; the power switch is on the right earcup	Eight microphones for feedback and adaptive feed-forward noise reduction; Quiet, Aware and Immersion modes plus custom modes; Aware Mode with ActiveSense briefly applies noise cancelling during very loud sounds; noise cancelling adjustable in the Bose app; Wind Block setting; CustomTune calibrates sound and noise cancelling to your ears each time you put them on
Audio features
Audio features	–	Bose Immersive Audio (Still keeps the sound in place as you turn your head; Motion lets it follow) using an onboard IMU; three-band EQ (bass, mid-range, treble) in the Bose app; aptX Adaptive with Snapdragon Sound devices
Battery
Listening time (maker's claim)
Listening time (maker's claim)	Up to 35 hours	Up to 24 hours
Battery life detail
Battery life detail	Around 35 hours from one replaceable AAA alkaline cell; the indicator flashes with approximately five hours remaining	Up to 24 hours with Immersive Audio off, 18 hours with it on; tested by Bose at 75 dB SPL in Quiet Mode; the headphones don't charge while switched on
Fast charging
Fast charging	–	15 minutes gives up to 2.5 hours with Immersive Audio off, 2 hours with it on (owner's guide; Bose UK's FAQ says 3 hours); full charge in up to 3 hours
Design
Weight
Weight	–	254 g
Bluetooth
Bluetooth	–	5.3
Two devices at once
Two devices at once	–	Yes
Headphone cable
Headphone cable	Yes	Yes
Controls
Controls	Power switch on the right earcup; Hi/Lo level switch on the audio cable for high-output sources such as aircraft systems	On the right ear cup, a Bluetooth/power button, a multi-function button (play, pause, skip, calls, modes) and a capacitive volume strip (swipe for volume; touch and hold for a shortcut to Immersive Audio settings, Spotify Tap, the voice assistant or battery level); on-head detection pauses and resumes audio and wakes or sleeps the headphones
Microphones
Microphones	–	Eight microphones in total; four are used for calls (two on each ear cup), in a beamforming array
Fit and ear tips
Fit and ear tips	Around-ear cushions; the earcups rotate inward for storage in the carrying case	Around-ear (circumaural) with an adjustable headband; removable protein leather cushions; plastic, aluminium and protein leather; fold flat for the carry case
Water resistance detail
Water resistance detail	–	No water resistance rating published
Works with
Works with	Detachable wired audio cable with 3.5 mm source plug; supplied adapter for dual 3.5 mm aircraft sockets	Bose app (launched with Bose Music) for iOS and Android; multipoint connection to two devices since a July 2024 update; Google Fast Pair; Spotify Tap; SimpleSync with Bose smart soundbars and speakers; 2.5 mm analogue input needs the headphones powered on; no USB audio
Colours
Colours	–	Black and White Smoke at launch; What Hi-Fi lists later Lunar Blue and Diamond 60th Edition finishes
In the box
In the box	Headphones, carrying case, audio cable, AAA battery and airline adapter; later packages also included a cable with remote and microphone	Headphones, carry case, 3.5 mm to 2.5 mm audio cable, USB-C (A to C) cable (50.8 cm), safety sheet