Sennheiser HDB 630 Review: Hi-Res Sound with USB-C Dongle

Experience premium Hi-Res sound with Sennheiser’s HDB 630 wireless headphones featuring a USB-C dongle for exceptional audio quality.

Sennheiser HDB 630: A Quick Dive into High-Resolution Wireless Audio

Ever wondered what happens when audiophile-grade headphones ditch the wires, add Bluetooth, and come bundled with a USB-C dongle for the ultimate sound experience? Enter the Sennheiser HDB 630. These wireless headphones are engineered to deliver Hi-Res Bluetooth audio to every user, no matter what smartphone you carry — yes, even iPhone owners get in on the action.

The magic lies in the included Sennheiser BTD 700 dongle, which unlocks aptX, aptX HD, and aptX Adaptive codecs, enabling streaming quality up to 24-bit/96kHz. Just plug the USB-C dongle into your device, pair it with the HDB 630, check your audio file’s quality, and you’re all set to be blown away.

Of course, Bluetooth streaming still involves some data loss, but the sound quality here is nothing short of exceptional — truly worthy of the revered Sennheiser HD 600 lineage. From my personal listening sessions, the HDB 630 delivered a wonderfully balanced, textured, and spacious soundstage that outperformed several competitors in this price bracket.

Out of the box, the headphones sport a neutral tuning that many audiophiles will appreciate — the bass is tight and energetic without being overpowering. A slight lift in the upper mids gives vocals extra room to shine, while highs remain controlled and never harsh.

The companion app, Sennheiser SmartControlPlus, offers a parametric equalizer and a crossfeed feature, letting you tailor the sound exactly to your liking.

But the customization doesn't stop at audio. The HDB 630 boasts adjustable active noise cancellation (ANC), transparent hearing modes, and adaptive ANC configurations, all working well to help you focus on your music whether on a plane or in the office.

However, the touch controls could use some polishing. Volume adjustments and one-tap pause functions sometimes felt fiddly, and the in-head detection was overly sensitive — the headphones occasionally turned on with just a light bump. While these features can be disabled, rivals like Sony WH-1000XM6 offer much smoother, more intuitive controls.

Still, the highlight for me was the battery life — a staggering 60 hours with ANC active. This is double what many top-tier headphones offer and made charging a rare necessity during my month of use.

Yes, there were minor gripes like microphone quality dips when using the dongle, and the fit isn’t the comfiest out there. But they sit snugly enough for marathon listening sessions, and mic quality without the dongle is solid.

All told, the HDB 630 is a stunning wireless debut in the beloved HD600 family, delivering detailed, immersive sound, massive battery life, and a rich feature set. For the price, these headphones are a tempting, easy recommendation.

Sennheiser HDB 630: Price & Release Date

• Price: $499 (approx. $499 USD)
• Released: October 2025

Launched in early October 2025, the HDB 630 marks Sennheiser’s first wireless entry into the iconic 6XX series. While not part of the Momentum or Accentum families, they feel like a natural sonic upgrade over the Sennheiser Momentum 4 Wireless.

At a premium $499, they compete with heavyweight rivals like Sony WH-1000XM6 and Bowers & Wilkins Px7 S3 — both formidable contenders we’ll explore later.

Sennheiser HDB 630: Specifications

• Drivers: 42 mm dynamic
• Active Noise Cancellation: Yes
• Battery Life: 60 hours with ANC
• Weight: 311 g
• Connectivity: Bluetooth 5.2, 3.5mm jack, USB-C
• Frequency Response: 6 Hz – 22 kHz

Sennheiser HDB 630: Feature Highlights

• Adaptive ANC and transparency modes
• SmartControlPlus app with parametric EQ and crossfeed
• Includes BTD 700 transmitter for premium Bluetooth audio quality

Sennheiser didn’t skimp on features here. The parametric equalizer is a standout, granting precise control over frequency bands with adjustable gain and Q-factor — an audiophile’s dream for tailored listening.

Personally, the EQ was intuitive, with clear instructions in the app. While I mostly stuck to the default sound, I did experiment with bass boosts, which was a fun tweak.

The crossfeed feature is a rarity on over-ear headphones. It blends left and right channels to balance extreme stereo separations — great if a track’s bass is heavily skewed to one side.

For instance, I tested it on Jimi Hendrix’s Purple Haze, where vocals originally panned hard right became more centered and balanced at full crossfeed. While I rarely used this feature, it’s a thoughtful addition for those sensitive to channel separation.

The real headline is Hi-Res Bluetooth audio support via the BTD 700 dongle. It unlocks aptX, aptX HD, and aptX Adaptive codecs, even for iPhone users often left out of high-res wireless audio clubs.

With the dongle, you get CD-quality and beyond — 24-bit/96kHz streaming (with some Bluetooth-related losses, naturally). This makes high-quality music playback accessible on nearly any modern device.

ANC performance impressed too, even if it’s not quite Bose QuietComfort Ultra Headphones Gen 2 level. The default ANC is set at 60%, likely for sound balance, but I dialed it to 100% during tests.

On a flight to Copenhagen, the low drone of jet engines was noticeably muted, and surrounding chatter almost disappeared with music playing at 60% volume. Some sharp sounds like seatbelt clicks still cut through, but overall, the noise cancellation was very effective.

Adaptive ANC is responsive and customizable, and transparency mode lets you hear your environment clearly — ideal for street safety or office chats. You can also enable wind noise reduction or turn off ANC altogether.

The “sound zones” feature lets you save EQ and ANC presets for different locations, automatically switching as you enter those zones — a neat touch of smart tech.

Battery life? Again, an outstanding 60 hours with ANC active, matching top-tier wireless legends like the Sennheiser Momentum 4 Wireless.

On the downside, I noticed a drop in call quality when using the BTD 700 dongle. Ending calls sometimes caused music playback distortions, and the SmartControlPlus app occasionally malfunctioned with the dongle inserted. Hopefully, firmware updates can iron these out. Without the dongle, call quality was excellent.

Overall, the HDB 630 offers a deeply customizable listening experience that's hard to beat.

• Feature rating: 4.5/5

Sennheiser HDB 630: Sound Quality

• Captivating, detailed sound
• Audiophile-friendly neutral tuning
• Hi-Res audio shines with BTD 700 dongle

Anyone acquainted with Sennheiser knows the brand sets high bars for sound quality, and the HDB 630 continues that proud legacy.

I was blown away by the clarity, detail, and expansive soundstage these headphones deliver — a rare find at this price point.

Their neutral tuning offers punchy but restrained bass, with less emphasis below 100 Hz than the Momentum 4. Mids are clear and upfront, with vocals gently boosted in the upper midrange. Highs are slightly tamer than many wireless rivals, resulting in a smooth, controlled presentation free from piercing or tinny artifacts.

Listening to Black Eye by Allie X revealed well-defined, confident vocals that sat neatly above the driving bass and electronic layers. Subtle percussion sparkled clearly, and electric guitars in the lower mids avoided the muddiness common on lesser headphones.

For softer fare like Rains Again by Solji, the HDB 630 excelled at rendering delicate high vocals and gentle acoustic guitars with tonal accuracy and emotional expression.

More ambient tracks like Spaceship by Marsolo showcased pristine environmental effects and positioning, though I found the bass lacked a bit of “bite” for my taste despite its speed and responsiveness.

Thankfully, there’s a bass boost toggle and extensive EQ presets for dialing in more low-end punch when desired.

Using my own EQ tweaks, Left And Right by D’Angelo came alive with textured, controlled bass layered under rich vocals and crisp percussion — the wide soundstage created an immersive, almost 3D experience few competitors in this range offer.

My primary listening was with the BTD 700 dongle and aptX Adaptive codec, which truly unlock the HDB 630’s potential for deeper, more detailed sound. Wired listening also impressed with responsiveness and elegant balance.

Simply put, they deliver true audiophile-level sound without wires.

• Sound quality rating: 5/5

Sennheiser HDB 630: Design

• Wireless design inspired by wired headphones
• Could feel more premium visually
• Touch controls and auto play/pause a bit clunky

So far, the HDB 630 nails sound and features, but the design is a mixed bag.

Visually, they lean heavily into a classic closed wired headphone aesthetic — just wirelessly enabled. I’m a fan of this continuity.

However, they don’t quite look as upscale as I expected for the price. The silver connectors between the headband and earcups come off somewhat plasticky, contrasting with the luxurious faux-leather padding. Overall, they're attractive but not as refined as competitors like the Bowers & Wilkins Px7 S3.

Touch controls were hit and miss. I appreciate touch interfaces, but here volume swipes sometimes jumped abruptly, and single taps to pause were too easy to trigger accidentally.

Sadly, touch controls are either on or off — no customization — which is a shame as I’d like to tailor sensitivity.

Track skipping and call controls, on the other hand, worked well.

The auto on/off head detection also felt overzealous. A few times, a slight bump on my desk powered them on and started music out loud, which was a bit annoying. I eventually disabled this, although the auto-pause on removing the headphones worked flawlessly.

Comfort-wise, the HDB 630 is decent for long sessions. They don’t press hard or irritate ears, though Sony’s WH-1000XM6 still feels lighter and more comfortable.

They don’t fold like many competitors, so they’re not the most travel-friendly. But the included case is well-made and protective, albeit a bit bulky with its zipper closure instead of magnets.

• Design rating: 3.5/5

Sennheiser HDB 630: Value for Money

• Fair price for the sound quality offered
• Competitors may offer better ANC and comfort
• Incredible feature set even compared to rivals

When it comes to value, the HDB 630 impresses — even though they’re not budget headphones.

For your $499, you get outstanding sound, and the BTD 700 dongle opens the door to Hi-Res Bluetooth audio, including for iPhones who usually miss out.

Compared to my trusty Sony WH-1000XM6 (priced similarly), the HDB 630 delivers a more open, detailed sound. The WH-1000XM6 has a more exciting out-of-the-box profile and superior noise cancellation and portability, but the Sennheisers shine with fine tunability.

Design and comfort place the HDB 630 squarely in the middle of the pack, neither best nor worst. But the feature set — parametric EQ, crossfeed, adaptive ANC, and crazy-long battery life — elevates them well beyond their price point.

• Value rating: 4.5/5

Should You Buy the Sennheiser HDB 630?

Sennheiser HDB 630 Alternatives

Sony WH-1000XM6

Sony WH-1000XM6 are among the best headphones released in 2025, boasting best-in-class noise cancellation, a balanced yet engaging sound, and the most intuitive touch controls I’ve ever used. They’re lighter and more comfortable than the HDB 630, with superior ANC and compactness. But they can’t match the Sennheiser’s epic battery life or slightly more detailed sound.

Bowers & Wilkins Px7 S3

Although the Px8 S2 is the newer flagship, the Px7 S3 better compares with the HDB 630 in price. This wireless headphone pair offers expansive sound, stunning looks, and a developing feature set — definitely worth your attention.

How I Tested the Sennheiser HDB 630

• Tested over one month
• Used in office and on flights
• Mostly listened via Tidal at 24-bit/96kHz quality

For a solid month, I carried the HDB 630 everywhere — office, home, walks, and flights. My main source was Tidal, taking advantage of the Hi-Res audio quality that Spotify’s lossless tier can’t touch. I used a TechRadar test playlist and sprinkled in favorites from my own collection.

I explored every major feature: crossfeed, parametric EQ, and ANC. For perspective, I often compared them directly to my tried-and-true Sony WH-1000XM6 to gauge sound and design differences.

“These headphones deliver detailed, immersive sound and massive battery life—making them an easy recommendation.”

— Enthusiastic Audiophile

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• What codec support does the Sennheiser HDB 630 offer?
  It supports aptX, aptX HD, and aptX Adaptive via the included BTD 700 dongle.
• How long does the battery last with ANC enabled?
  You get an impressive 60 hours of playback with active noise cancellation turned on.
• Is the sound tuning neutral or bass-heavy?
  The headphones feature a neutral sound profile with energetic but controlled bass.
• Are the touch controls easy to use?
  They work, but some functions like volume adjustment and pause can feel clunky and overly sensitive.
• Does the HDB 630 fold for compact storage?
  No, they don’t fold, but a sturdy carrying case is included.