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Bose QuietComfort 35 II vs Bose QuietComfort 45

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

Better figure, where one is clearly better

BoseQuietComfort 35 IIBoseQuietComfort 45
Overview
ReleasedSeptember 2017September 2021
Sound
TypeOver-earOver-ear
Noise cancellingYesYes
Transparency mode–Yes
Bluetooth codecsSBC and AACSBC and AAC
Noise cancelling detailHigh, Low and Off settings in the Bose Connect app or via the Action button; defaults to High on power-up; no dedicated transparency mode described in the maker's guideTwo modes, Quiet (full noise cancelling) and Aware (full transparency); microphones inside and outside the ear cups with a proprietary digital chip, tuned for mid-range frequencies such as voices
Audio featuresNo custom equaliser in Bose Connect (SoundGuys); SBC and AAC codecs confirmed by SoundGuysTriPort acoustic architecture; Active EQ; adjustable EQ (bass, mid-range and treble) in the Bose Music app
Battery
Listening time (maker's claim)Up to 20 hoursUp to 22 hours
Battery life detailUp to 20 hours wirelessly or 40 hours using the supplied audio cable; headphones do not play while charging; analogue listening remains possible with a depleted batteryUp to 22 hours on Bose's current product page, tested with noise cancelling on at 50% volume in continuous playback; Bose quoted up to 24 hours at launch (2021 press release); wired listening with the audio cable extends play time
Fast chargingFull charge in up to two hours (current owner's guide); What Hi-Fi reports 15 minutes provides 2.5 hours of wireless listening15 minutes gives up to 3 hours; full charge in up to 2.5 hours (Bose UK; the launch press release said two hours)
Design
Weight–240 g
Bluetooth4.15.1
Two devices at onceYesYes
Headphone cableYesYes
ControlsPower/Bluetooth slider, volume buttons and multi-function button on the right earcup; left Action button can control noise cancellation; multi-function button accesses the phone's voice controlPhysical buttons; on the right ear cup, power, volume up, volume down and a multi-function button (play, pause, calls, voice assistant); on the left ear cup, an Action button to switch modes and mute the microphone on calls
MicrophonesBuilt-in microphone system for calls and voice assistants; maker's launch announcement describes voice pickup but does not publish a microphone countFour external microphones for voice pickup in a beamforming array with a noise-rejection algorithm; What Hi-Fi counts six microphones in total
Fit and ear tipsAround-ear cushions; headband folds and earcups rotate for the supplied carry caseAround-ear with plush synthetic leather ear cushions and headband; impact-resistant nylon with cast-metal hinges; folds flat for the carry case
Case weight–0.18 kg (carry case)
DimensionsSoundGuys reports 235.3 g and 180 × 170 × 81 mm; What Hi-Fi's table gives 240 g; no current maker headphone weight was verified, so the main weight field is left out–
Water resistance detailNo IP rating verified in the maker documents used; owner's guide says not to use near waterNo water resistance rating published
Works withBose Connect app for iOS and Android; two active Bluetooth devices, one audio stream at a time, with eight stored pairings; NFC pairing; SimpleSync with compatible Bose speakers and soundbars; Bluetooth 4.1 confirmed by TechRadar; Google Assistant is not available on iOS according to Bose's current article; current maker product page also lists Amazon Alexa, subject to country and language availabilityBose Music app for iOS and Android; multipoint connection to two devices; remembers up to seven paired devices; SimpleSync with Bose smart soundbars and speakers; Spotify Tap
ColoursBlack and Silver at launchTriple Black and White Smoke at launch
In the boxHeadphones, carry case, USB charging cable and analogue audio cable; micro-USB charging connector; 2.5 mm headphone to 3.5 mm device audio cable (TechRadar)Headphones, carry case, 30.5 cm USB-C charging cable, 3.5 mm to 2.5 mm audio cable

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