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Bose QuietComfort Ultra Headphones (2nd Gen) vs Focal Bathys MG

Every spec side by side, from each maker's published figures.

Better figure, where one is clearly better

BoseQuietComfort Ultra Headphones (2nd Gen)FocalBathys MG
Overview
ReleasedSeptember 2025April 2025
Sound
TypeOver-earOver-ear
Noise cancellingYesYes
Transparency modeYesYes
Driver size–40 mm
Spatial audio with head trackingYes–
Bluetooth codecsSBC, AAC and aptX AdaptiveSBC, AAC, aptX and aptX Adaptive
Lossless over USB-CYesYes
Drivers–Magnesium drivers with 'M'-shaped domes, made in France; 10 Hz to 22 kHz (±3 dB); harmonic distortion < 0.2% at 1 kHz
Noise cancelling detailQuiet Mode (full noise cancelling) and Aware Mode with ActiveSense, now smoother at damping sudden noise spikes; noise cancelling adjustable or fully off in the Bose app; CustomTune tailors sound and noise cancelling to your ears; wind block in custom modesTwo noise-reduction modes (Silent, the strongest, and Soft, which cuts low-frequency noise) plus a Transparency mode, chosen with a button on the left ear cup or in the app
Audio featuresBose Immersive Audio (Still keeps the virtual speakers in place as you turn your head; Motion lets them follow) and Cinema Mode; up to seven custom modes; adjustable EQ in the Bose app; lossless USB-C audio at 16-bit, 44.1 or 48 kHz; aptX Adaptive with Snapdragon Sound devices, which Bose says adapts to lossless audio and low latency; Gaming ModeUSB-DAC mode up to 24-bit/192 kHz over USB-C; EQ with presets and custom settings plus a Mimi hearing test in the Focal & Naim app
Battery
Listening time (maker's claim)Up to 30 hoursUp to 30 hours
Battery life detailUp to 23 hours with Immersive Audio on; up to 45 hours with noise cancelling and Immersive Audio off; tested by Bose at 75 dB SPL; low-power standby when laid flat or put in the case; can be used while charging1,060 mAh lithium-ion battery; 30 hours over Bluetooth with noise cancelling, 35 hours in jack mode, 42 hours in USB-DAC mode; full charge in about 1.5 hours with a 2 A adaptor
Fast charging15 minutes gives up to 3 hours with noise cancelling on and Immersive Audio off (Bose's test footnote gives 2.5 hours); full charge in up to 3 hours15 minutes for about 5 hours (with a 2 A adaptor)
Design
Weight264 g350 g
Bluetooth5.45.2
Two devices at onceYesYes
Headphone cableYesYes
ControlsOn the right ear cup, a Bluetooth/power button, a multi-function button (play, pause, skip, calls and modes) and a capacitive volume strip (swipe for volume; touch and hold for a shortcut to Immersive Audio settings, Spotify Tap or the voice assistant); on-head detection pauses and resumes audio, answers calls and wakes the headphonesPower/DAC slide switch; multifunction button, + and – buttons; ANC/transparency button on the left ear cup; voice assistant button on the right ear cup; backlit logo that can be switched off in the app
MicrophonesFour microphones for calls, two on each ear cupEight microphones with Clear Voice technology for calls
Fit and ear tipsAround-ear (circumaural) with an adjustable headband; removable protein leather cushions; plastic and aluminium build with polished metal yokes; folds for the carry caseAround-the-ear, closed-back; genuine leather and microfibre headband, magnesium yoke, aluminium construction; clip-on earpads are replaceable
Works withBose app for iOS and Android; multipoint connection to two devices; Google Fast Pair; Spotify Tap; SimpleSync with a Bose Smart Soundbar or Bose Smart SpeakerFocal & Naim app for iOS and Android; Google Fast Pair; two devices at once, up to eight remembered; 3.5 mm jack input on the right ear cup (switches off Bluetooth)
ColoursBlack, White Smoke, Driftwood Sand and Midnight Violet at launch; Bose UK now also sells Cherry Chocolate, Desert Gold and Olive GreenGraphen Grey, Chestnut
In the boxHeadphones, carry case, 3.5 mm to 2.5 mm audio cable, USB-C to USB-C cable (99 cm), safety sheetHeadphones, rigid carrying case (24 x 21 x 7 cm), 1.2 m 3.5 mm jack cable, 1.2 m USB-C cable, quick start guide

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