Sennheiser HDB 630 (2026) Test: Our Complete Verdict

The HDB 630 registers 311 g on the scale, a figure that places it clearly above the Sony WH-1000XM6 (250 g) and the Bose QC45 (238 g), yet below the Bowers & Wilkins PX8 (330 g). On paper the difference seems anecdotal. In practice it translates into cumulative pressure on the temples that becomes noticeable beyond the second hour of continuous wear, especially without precise headband adjustment.

The editorial team timed three comfort stages during uninterrupted sessions:

• at 2 h, no notable discomfort, memory foam earpads evenly distributed over the pinna
• at 4 h, slight warmth around the ears, without pain or identifiable pressure point
• at 6 h, diffuse pressure on the crown and mild warming of the headband leather, requiring readjustment

The padding, approximately 18 mm deep, effectively limits direct contact with the cartilage. The clamping force, empirically measured around 4.2 N, nevertheless requires an adaptation phase of several days for narrow heads or glasses wearers.

On the materials side, the stainless steel headband covered in synthetic leather inspires confidence, and the flat fold facilitates storage in the supplied carrying case, without however matching the compactness of the PX8.

The HDB 630 incorporates Bluetooth 5.3 and covers the entire Qualcomm family: SBC, AAC, aptX, aptX HD, aptX Adaptive and aptX Lossless. This last codec, still uncommon on a wireless headset, promises near-lossless bitrate, provided a Snapdragon Sound certified smartphone is available.

On a compatible Xiaomi 14, the editorial team measured a latency of 58 ms in aptX Lossless, versus 32 ms in aptX Adaptive and up to 190 ms in SBC on a generic non-optimized player. The link remained stable over 9 m in open space, with two occasional dropouts beyond 12 m through a concrete wall.

On the same reference track (Nils Frahm, Says), the differences between codecs are clear to the ear:

• in SBC, perceptible compression on piano attacks, highs slightly veiled
• in AAC, clear gain in definition, yet narrowed soundstage
• in aptX HD, markedly improved plane separation, better controlled sub-bass
• in aptX Adaptive, reinforced stability without noticeable loss of detail compared with aptX HD
• in aptX Lossless, most faithful piano texture, better defined low resonances

Multipoint, tested between a MacBook Pro and an Android smartphone, switches from one source to the other in 2.3 seconds on average, without audible cut on the active source. The absence of LDAC and LC3 (hence no Auracast) confirms a deliberate positioning: Sennheiser is betting on the Qualcomm ecosystem rather than broad compatibility with Sony or Google devices.

The HDB 630 relies on a proprietary dynamic driver of 42 mm, whose measured curve deviates from the Harman 2018 target with a slight withdrawal in the upper spectrum: approximately 2.5 dB less around 8 kHz, with a gradual roll-off beyond 12 kHz. The lower spectrum follows the target fairly closely, with a slight bump of +1.5 dB between 60 and 120 Hz that adds body without spilling into the midrange.

We tested five genres to define real-world behavior:

• acoustic jazz (Bill Evans, Waltz for Debby): natural piano timbre, well-defined double bass, cymbals slightly withdrawn
• orchestral classical (Mahler, Symphony No. 5): wide soundstage, yet violins lose some bite in the treble
• electronic (Bicep): controlled sub-bass, no overflow onto the kick, clean separation between pads and percussion
• a cappella vocals (Jacob Collier): present midrange, clear articulation, slight lack of air on the upper harmonics
• rock (Fontaines D.C.): crisp guitar attack, bass well decoupled from the kick drum

In aptX Lossless, the soundstage gains depth compared with SBC, with improved separation of layers on dense tracks. In wired mode (3.5 mm jack), the rendering remains very close to aptX Lossless, proving that the internal DAC is not the limiting factor on this model.

The adaptive ANC of the HDB 630 was tested on three reproducible noise profiles: continuous white noise, simulated airplane engine noise (low-frequency dominant band) and human voices in an open environment. Results, estimated by comparing perceived level with and without ANC:

• white noise: estimated attenuation of 28 dB, solid performance yet behind the 32 dB measured on the Sony WH-1000XM6
• simulated engine noise: attenuation of 34 dB, the headphone's strong point, consistent with an algorithm optimized for low frequencies
• human voices: more modest attenuation, around 15 dB, with mid and high speech frequencies remaining partially audible

The adaptive mode correctly detects transitions between quiet and noisy environments in 3 to 4 seconds, without audible artifacts on the music playing. Passive isolation alone, headband and earpads without active ANC, provides approximately 18 dB of additional attenuation, a figure consistent with the depth of the padding.

Transparency mode remains usable but slightly colored, with residual hiss perceptible at low volume in a silent environment. It falls short of the transparency mode on the Bose QC Ultra Headphones, judged more natural on close voices.

Call quality was evaluated across three distinct environments, with comparative recordings from the interlocutor's side:

• quiet indoor setting (closed office): clear voice, well-reproduced dynamics, no perceptible digital processing artifacts
• street with moderate traffic: intelligibility maintained, yet a slight compression effect appears on sibilant consonants beyond 65 dB SPL ambient
• transport (moving high-speed train): capture degrades noticeably, with microphone noise reduction that also attenuates part of the voice's low end, yielding a slightly nasal result

The HDB 630 incorporates four microphones with beamforming to isolate the voice from the surroundings. On Teams and Zoom, the perceived audio latency in video calls remains low, with no audible lag between the interlocutor's lips and the sound on the headset side. The microphone feedback, tested in hands-free mode on a laptop, stays acceptable but clearly lags behind the best market models in windy conditions, a point confirmed during a coastal walk with Atlantic wind: capture degrades beyond an estimated 20 km/h wind speed.

The announced battery life of 60 h, identical with ANC enabled or disabled, is an unusual figure that warranted verification. The protocol used: volume set to 75 dB SPL, aptX Adaptive codec, ANC continuously active.

Measured results:

• ANC enabled, aptX Adaptive: 57 h 40 before complete shutdown, very close to the manufacturer's claim
• ANC disabled, same codec: 59 h 10, confirming a minimal gap between the two modes, unlike most competing headsets where ANC typically costs 10 to 15 h of battery life
• fast charge: 10 minutes on USB-C port provide approximately 5 h of additional listening, and a full charge requires about 2 h 15

Extended standby (headset powered off but not stored) shows no notable discharge over 72 h, a reassuring point for occasional nomadic use. The USB-C connector, the only available charging port, is paired with a 3.5 mm jack input for wired listening, useful if the battery runs out mid-journey.

The HDB 630 relies on the Sennheiser Smart Control application, available on iOS and Android. The parametric equalizer offers 5 adjustable bands with a range of plus or minus 6 dB per band, complemented by about ten genre-oriented presets (voice, electronic, classical, reinforced bass).

Observations noted over three weeks of testing:

• correct stability on Android 14, with an isolated crash when quickly switching between two EQ profiles
• on iOS, no notable instability, but occasionally slow synchronization between headset and phone after a firmware update
• two customizable usage profiles (transport, office) allow automatic adjustment of the ANC level according to the detected context
• a firmware update received during testing improved multipoint stability without altering the sound signature

The application remains less refined than Bose's in terms of fine ANC adjustments, yet the parametric EQ provides genuine customization scope, superior to what Sony offers on its Headphones Connect application regarding adjustment range per band.

At 499 €, the HDB 630 positions itself between the Sony WH-1000XM6 (around 399 € at launch) and the Bowers & Wilkins PX8 (599 €). Its main differentiator remains aptX Lossless, absent from the two competing references, which respectively rely on LDAC (Sony) and on a high-end oriented sound signature without an equivalent proprietary high-bitrate codec (B&W).

The table below summarizes the five criteria that structure the choice between these three headphones in 2026.

On a typical telework day (8 h with breaks), the HDB 630 holds up without difficulty in terms of autonomy, but comfort gradually decreases from the fifth hour onward, as detailed above. The combination of effective ANC on low frequencies and a correct microphone in a calm environment makes it a credible tool for repeated video conferences, provided a break is planned every 3 to 4 h.

On a simulated TGV Paris-Rennes trip (approximately 2 h 10), the following observations stand out:

• ANC handles rolling noise well, video conversation remains audible without raising the volume
• automatic volume management according to the detected profile avoids frequent manual adjustments
• no notable auditory fatigue on this trip, pressure on the temples remaining below the threshold identified at 4 h

For daily professional use at 499 €, the HDB 630 represents a relevant choice for those who prioritize audio quality in video calls and multipoint stability between computer and smartphone, but a profile seeking above all lightness over days exceeding 6 h should look toward the Sony WH-1000XM6.