SENNHEISER HDB 630

PRODUCT DESCRIPTION

Uncompromising audiophile listening, wherever you are

Imagine closing your eyes and hearing every breath of the saxophonist, every vibration of the double bass string, the depth of space between the instruments. The Sennheiser HDB 630 are more than just wireless headphones: they are the first pair of closed-back headphones that bring critical studio listening out of the recording studio and into your everyday life. Designed for those who refuse to compromise between wireless freedom and audiophile fidelity, they represent the definitive answer to a question enthusiasts have been asking for years: is it possible to have hi-res resolution, tonal neutrality, and extreme battery life in a single wireless product?

Technical Excellence: When Engineering Serves the Music

The beating heart of the HDB 630 is the 42mm electrodynamic transducer developed in-house by Sennheiser. This isn't a generic driver: every component in the audio chain has been designed to work in perfect synergy. The frequency response extends from 6 Hz to 40 kHz in USB-C mode, ensuring reproduction that far exceeds the human audible spectrum and captures every micro-detail of the original recording.

But the real revolution is the included BTD 700 USB-C Bluetooth dongle, which transforms any laptop or mobile device into a hi-res source. Thanks to aptX Adaptive and aptX HD support, you get wireless transmission up to 24-bit/96 kHz with virtually no perceptible loss. For the most demanding purists, the direct USB-C connection offers a completely lossless digital path, eliminating any intermediate analog conversion.

The adaptive noise cancellation (ANC) has been calibrated with audiophile philosophy: instead of overprocessing the signal, the intelligent algorithm selectively removes ambient frequencies without affecting dynamics, the soundstage, or the transparency of the midrange. The result? You can listen to a string quartet on an airplane and experience the same spatiality as in an empty concert hall.

Listening Benefits: How the HDB 630 Transforms Your Music Experience

The HDB 630's neutral response curve is a philosophical manifesto. While most consumer headphones emphasize bass for an instant "wow" effect, Sennheiser has chosen the path of timbral truth. The bass is fast, extended, and controlled: you feel the impact of the kick drum without it masking the vocals. The mids are crystal clear and present, with a richness that makes vocals incredibly realistic and intimate. The highs remain open and airy without ever being fatiguing, even after hours of listening.

This neutrality isn't aseptic: it's liberating. It means that for the first time, you can listen to music as the artist intended, without manufacturer-imposed colorations. With the Smart Control Plus app's parametric equalizer, you have the freedom to customize each band with surgical precision. Prefer a touch of warmth in the mids? Want a roll-off in the sub-bass? You're in total control.

The crossfeed function is a nice touch for those who listen to stereo recordings with headphones: it simulates natural listening through speakers, reducing fatigue and creating a more coherent, three-dimensional soundstage.

And then there's the battery life: 60 hours of continuous playback. Not hours of standby, but real listening with ANC enabled. That means you can tackle an intercontinental flight, a week-long commute, or a mixing marathon without ever having to think about recharging.

Setup and compatibility: ready to use, anywhere

The HDB 630 are designed for the modern ecosystem. The BTD 700 USB-C dongle connects to laptops, tablets, smartphones, game consoles, and even the latest-generation audiophile DAPs. Bluetooth 5.2 ensures excellent stability even in crowded wireless environments.

The included hard case protects your investment while traveling, while the weight of just 311 grams and the leatherette over-ear cushions ensure long-lasting comfort even during critical listening sessions exceeding 4-5 hours. The detachable 3.5mm audio cable makes them compatible with traditional analog systems, headphone amplifiers, and in-flight entertainment systems.

Sennheiser Heritage: 75 Years of Acoustic Excellence

Sennheiser is no newcomer to the world of professional audio. Since 1945, the German company has been setting the standards for reference listening in recording studios, mastering rooms, and on stages around the world. The HDB 630 inherits this DNA and translates it into the first pair of wireless closed-back headphones designed for the discerning audiophile who wants mobility. Every design choice—from the transducer to the response curve, from noise cancellation to codec implementation—reflects decades of experience in professional listening.

HDB 630 vs. MOMENTUM 4: Which should you choose?

The Sennheiser MOMENTUM 4 are excellent lifestyle headphones with a warm, immersive sound. The HDB 630 are critical listening tools. The main difference? Tonal neutrality. Where the MOMENTUM 4 emphasizes bass and subbass for a more satisfying sound at first listen, the HDB 630 offers a linear and balanced response that reveals every nuance of the recording. Additionally, the HDB 630 includes the BTD 700 dongle for hi-res resolution via Bluetooth and a parametric equalizer for precise customization. Choose the MOMENTUM 4 for everyday use and immediate listening pleasure; choose the HDB 630 if you're an audiophile, a music producer, or simply don't want to compromise on sound fidelity.

TECHNICAL SPECIFICATIONS

Audio Features

Transducer: 42mm electrodynamic (moving coil)

Frequency Response: 6 Hz – 40 kHz (USB-C), 6 Hz – 22 kHz (Bluetooth/analog)

Maximum Resolution: 24-bit/96 kHz (via USB-C)

Nominal Impedance: 480 Ω (active mode)

THD (Total Harmonic Distortion): <0.2% (1 kHz / 100 dB SPL)

Maximum SPL: 105 dB

Connectivity and Codecs

Bluetooth: 5.2

Supported Codecs: aptX Adaptive, aptX HD, aptX, AAC, SBC

Dongle Included: BTD 700 USB-C Bluetooth (hi-res transmission)

Battery and Battery Life

Battery Life: Up to 60 hours (with ANC enabled)

Charging: USB-C

Design and Comfort

Type: Closed, over-ear headphones

Weight: 311g (without cable)

Earpads: Premium leatherette

Case: Hard case included

Advanced Features

Adaptive Active Noise Cancelling (ANC)

Parametric equalizer (Smart Control Plus app)

Crossfeed function for natural listening

Touch control on the earcups

Included Accessories

BTD 700 USB-C Bluetooth dongle

USB-C to USB-C cable (1.20m)

3.5mm audio jack cable (1.20m)

Airline adapter

Hard case

FAQ – FREQUENTLY ASKED QUESTIONS

1. Are the Sennheiser HDB 630 suitable for professional studio monitoring? Absolutely. Thanks to their neutral frequency response, up to 24-bit/96kHz resolution via USB-C, and a high-precision 42mm driver, the HDB 630 are perfect for mixing, mastering, and critical listening. The lossless USB-C connection makes them comparable to professional wired studio headphones, with the advantage of wireless freedom when needed.

2. How long does the battery actually last with ANC enabled? The HDB 630 offer up to 60 hours of continuous playback with active noise cancellation. This equates to about a week of heavy use (8 hours per day) without a charge, making them ideal for long trips, extended work sessions, and worry-free everyday use.

3. What's the difference between the HDB 630 and the MOMENTUM 4? The MOMENTUM 4 has a warmer, more immersive sound signature, perfect for casual listening. The HDB 630 are calibrated for audiophile neutrality, offer superior resolution (24-bit/96kHz via Bluetooth with the BTD 700 dongle), parametric equalizer, and crossfeed functionality. The HDB 630 are the perfect choice for audiophiles, audio professionals, and anyone who doesn't want to compromise on tonal fidelity.

4. Does the BTD 700 dongle work with other audio devices? Yes, the included BTD 700 USB-C Bluetooth dongle can be used with any device with a USB-C port: laptops, tablets, Android smartphones, game consoles (Nintendo Switch, PS5), digital audio players (DAPs), and even some external DACs. It instantly transforms any device into a wireless hi-res source.

5. Can I use the HDB 630 wired for even better sound? Yes. You can connect the HDB 630 via USB-C cable for a fully digital, lossless signal up to 24-bit/96kHz, or via the included 3.5mm jack cable for use with analog amplifiers, traditional hi-fi systems, or in-car entertainment systems. Wired mode completely bypasses the wireless processing.

6. Does the ANC compromise audio quality like other headphones? No. Sennheiser has developed an adaptive noise cancellation algorithm specifically tuned to preserve dynamics, transparency, and the soundstage. Unlike many consumer headphones, the HDB 630's ANC selectively removes only ambient frequencies without introducing compression or audible artifacts.