HDB 630

Released October 2025

Noise-cancelling over-ear headphones with USB-C audio, a parametric equaliser and an included Bluetooth transmitter, suited to listeners who want higher-resolution audio from phones and computers.

Type: Over-ear
Noise cancelling: Yes
Battery: 60 h
With case: –
Best codec: aptX Adaptive
Weight: 311 g

What reviewers say

Reviewers praise the detailed sound, comfortable padding, long battery life and flexible connections. Both find the parametric equaliser useful and the bundled transmitter valuable for devices lacking aptX Adaptive. Noise cancelling is the main compromise, falling behind the strongest Sony and Bose alternatives.

From whathifi.com and soundguys.com

Specifications

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Sound

Type: Over-ear
Noise cancelling: Yes
Transparency mode: Yes
Driver size: 42 mm
Back: Closed
Impedance: 480 ohms
Bluetooth codecs: SBC, AAC, aptX and aptX Adaptive
Lossless over USB-C: Yes
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
Noise cancelling detail: Adaptive noise cancellation and adjustable Transparency Mode
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

Battery

Listening time (maker's claim): Up to 60 hours
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
Fast charging: 10 minutes gives up to 7 hours of listening; full charge approximately 2 hours (manual)

Design

Weight: 311 g
Bluetooth: 5.2
Two devices at once: Yes
Headphone cable: Yes
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
Microphones: Four omnidirectional MEMS microphones in two beamforming pairs; 50 Hz to 10 kHz microphone response (manual)
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
Water resistance detail: No water resistance rating published
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
Colours: Black; Lunar Silver added in September 2026 (Sennheiser US announcement)
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

Pros and cons

Pros

Included BTD 700 USB-C transmitter enables aptX Adaptive on compatible USB sources
USB-C audio up to 24-bit/96 kHz and a 3.5 mm source cable
Up to 60 hours of Bluetooth playback with noise cancelling