Sennheiser HDB 630 vs Sonos Ace Ultra

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HDB 630 compared with Ace Ultra

	SennheiserHDB 630	SonosAce Ultra
Overview
Released
Released	October 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	42 mm	40 mm
Back
Back	Closed	–
Impedance
Impedance	480 ohms	–
Bluetooth codecs
Bluetooth codecs	SBC, AAC, aptX and aptX Adaptive	SBC, AAC and aptX Lossless
Lossless over USB-C
Lossless over USB-C	Yes	Yes
Drivers
Drivers	Dynamic transducer; 6 Hz to 40 kHz via line-in, 96 kHz USB or 96 kHz aptX Adaptive, 6 Hz to 22 kHz otherwise; active impedance 480 Ω; 105 dB SPL at 1 kHz/0 dBFS; THD below 0.2% at 1 kHz/100 dB SPL	Custom-designed 40 mm dynamic driver in each cup
Noise cancelling detail
Noise cancelling detail	Adaptive noise cancellation and adjustable Transparency Mode	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	Smart Control Plus parametric EQ and crossfeed; USB audio up to 24-bit/96 kHz; Bluetooth codecs include aptX HD as well as aptX Adaptive, aptX, AAC and SBC; the headphones do not support aptX Lossless even though the included BTD 700 supports it with other compatible headphones	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 60 hours	Up to 35 hours
Battery life detail
Battery life detail	Bluetooth playback with ANC activated; 700 mAh, 3.7 V, 2.59 Wh lithium-polymer battery (manual); analogue listening requires power (What Hi-Fi?); USB audio also charges the headphones	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	10 minutes gives up to 7 hours of listening; full charge approximately 2 hours (manual)	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	311 g (better)	322 g
Bluetooth
Bluetooth	5.2	6.0
Two devices at once
Two devices at once	Yes	Yes
Headphone cable
Headphone cable	Yes	Yes
Controls
Controls	Right-earcup touch pad for playback, volume, calls and ANC/transparency, multifunction button for power/pairing and the phone's voice assistant; Smart Pause wearing detection	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	Four omnidirectional MEMS microphones in two beamforming pairs; 50 Hz to 10 kHz microphone response (manual)	Ten microphones for noise control, calls, Aware mode and TrueCinema
Fit and ear tips
Fit and ear tips	Synthetic leatherette earpads and Japanese IDEATEX Protein Leatherette headband; swivelling earcups and replaceable pads; 311 g without cable on the UK specification page, versus 293 g in the manual	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 water resistance rating published	No IP rating published; maker guide says the headphones are not waterproof
Works with
Works with	Sennheiser Smart Control Plus; connects to two Bluetooth devices, plays audio from one at a time; included BTD 700 is Bluetooth 5.4, while the headphones are Bluetooth 5.2; aptX Adaptive via the dongle requires High Resolution mode in the app	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	Black; Lunar Silver added in September 2026 (Sennheiser US announcement)	Black, Soft White, Agave, Sand
In the box
In the box	Headphones, BTD 700 USB-C dongle, 1.2 m USB-C to USB-C charging/audio cable, 1.2 m analogue cable with 3.5 mm source plug, in-flight adapter and carrying case	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