Bowers & Wilkins Px7 S3 vs Sonos Ace Ultra

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Px7 S3 compared with Ace Ultra

	Bowers & WilkinsPx7 S3	SonosAce Ultra
Overview
Released
Released	April 2025	September 2026
Sound
Type
Type	Over-ear	Over-ear
Noise cancelling
Noise cancelling	Yes	Yes
Transparency mode
Transparency mode	Yes	Yes
Spatial audio with head tracking
Spatial audio with head tracking	–	Yes
Driver size
Driver size	40 mm	40 mm
Bluetooth codecs
Bluetooth codecs	SBC, AAC, aptX, aptX Adaptive and aptX Lossless	SBC, AAC and aptX Lossless
Lossless over USB-C
Lossless over USB-C	Yes	Yes
Drivers
Drivers	40 mm dynamic full-range biocellulose drive units, angled towards the ears; dedicated discrete headphone amplifier; Bowers & Wilkins DSP with 24-bit/96 kHz processing	Custom-designed 40 mm dynamic driver in each cup
Noise cancelling detail
Noise cancelling detail	Eight microphones (two measure each drive unit's output, four monitor outside noise, two for voice); noise cancelling On, Pass-Through or Off from the Quick Action button or the Music app	Adaptive Active Noise Cancellation adjusts to changes in fit and surroundings; Aware mode with optional Voice Boost; sidetone lets you hear your own voice during calls
Audio features
Audio features	aptX Adaptive 24/96 and aptX Lossless (Snapdragon Sound); also aptX HD; 5-band EQ with presets, or True Sound mode; USB-C audio interface; spatial audio and LE Audio with LC3 and Auracast promised as later updates	Dolby Atmos and dynamic Dolby Head Tracking with compatible content and devices; TrueCinema tunes playback to your room and compatible Sonos soundbar; TV Audio Swap supports two pairs, with head tracking available for one pair. Adaptive EQ plus 3-band or 8-band EQ and Loudness controls
Battery
Listening time (maker's claim)
Listening time (maker's claim)	Up to 30 hours	Up to 35 hours
Battery life detail
Battery life detail	Rechargeable lithium-ion battery; 30 hours of wireless streaming with noise cancelling on at average volume; full charge takes up to 2 hours	Replaceable 1060 mAh lithium-ion battery; up to 35 hours with ANC or Aware mode on, or 50 hours with ANC off in the maker guide
Fast charging
Fast charging	15 minutes for up to 7 hours	Three minutes from empty provides up to three hours of listening; full charge from empty in up to three hours. USB-C power adaptor sold separately
Design
Weight
Weight	300 g (better)	322 g
Bluetooth
Bluetooth	5.3	6.0
Two devices at once
Two devices at once	Yes	Yes
Headphone cable
Headphone cable	Yes	Yes
Controls
Controls	Volume up, volume down and multi-function buttons on the right ear cup; power switch and Quick Action button (noise cancelling modes or voice assistant) on the left; wear sensors in both ear cups pause and resume playback	Content Key slides for volume and presses for playback, calls and audio swapping; Noise Control button cycles noise modes or activates the connected device's voice assistant; Power/Bluetooth button; wear detection pauses and resumes playback
Microphones
Microphones	Eight microphones in total, all used for calls; ADI Pure Voice call processing	Ten microphones for noise control, calls, Aware mode and TrueCinema
Fit and ear tips
Fit and ear tips	Over-ear; leather and aluminium; ear cushions and headband replaceable by trained service engineers	Adjustable stainless-steel headband; rotating ear cups with magnetically attached replaceable cushions; contrasting right-cup interior. Current UK page gives 322 g, while the maker guide gives 325 g
Dimensions
Dimensions	–	Current UK page gives 193 mm height, 163 mm width, 90.8 mm ear-cup width and 45 mm ear-cup depth; maker guide instead lists overall depth 84 mm
Water resistance detail
Water resistance detail	–	No IP rating published; maker guide says the headphones are not waterproof
Works with
Works with	Bowers & Wilkins Music app for iOS and Android; Google Fast Pair; two devices at once; USB-C sound output for computers and phones; analogue input through the USB-C port with the supplied cable (Bluetooth disconnects)	Bluetooth multipoint to two devices, disabled by default; USB-C digital audio and supplied USB-C to 3.5 mm analogue cable, with Bluetooth disabled during cable use. Maker guide specifies aptX Lossless; SBC and AAC are listed by What Hi-Fi. Headphone linking over 802.11a/b/g/n Wi-Fi on 2.4 or 5 GHz requires a compatible Sonos speaker and the Sonos app; opt-in Early Access, provided as-is and subject to change
Colours
Colours	Anthracite Black, Canvas White, Indigo Blue, Frost Blue, Vintage Maroon	Black, Soft White, Agave, Sand
In the box
In the box	Headphones, carry case (177 x 60 x 234 mm), 1.2 m USB-C to USB-C cable, 1.2 m USB-C to 3.5 mm audio cable, document pack	Headphones, travel case with removable cable pouch, 0.75 m USB-C to USB-C cable, 1.2 m USB-C to 3.5 mm cable, setup and warranty documentation; analogue cable is not compatible with third-party replacements