Sennheiser HDB 630: two-minute review

What happens when you cut the wires off your audiophile-grade headphones and fit a Bluetooth module inside, then add a USB-C dongle to the box so people can hear them at their best? You get the Sennheiser HDB 630. These wireless headphones are intended to deliver ‘hi-res’ Bluetooth audio to anyone, no matter which smartphone you’re using – yes, even an iPhone.

To achieve this, Sennheiser has bundled in its BTD 700 dongle, which opens up access to the aptX, aptX HD and aptX Adaptive codecs, and up to 24-bit / 96kHz streaming quality. Just plug the USB-C dongle into your phone, pair it to the Sennheiser HDB 630, mkae sure your file quality is of the desired standard and you’re good to go.

Of course, some data is lost when streaming over Bluetooth, but still, the audio quality here is exceptional and deserving of Sennheiser’s HD (ie. reference grade) lineup. I was very impressed by the beautifully balanced, textured, and well-separated performance of the HDB 630, which outperformed even some of the best headphones I’ve tested in this price-range.

They have a neutral tuning out of the box, which a lot of audiophiles will appreciate – the bass is far from overbearing, though it remains punchy and responsive. A bump in the upper midrange often gives vocals a little bit of extra room to express themselves too, while treble is controlled and never too intense.

With parametric EQ and crossfade functions, you can also adapt the sound to your specific tastes – there’s so much customizability to access with the Sennheiser SmartControlPlus companion app.

And that applies to more than just sound. There’s customizable active noise cancellation, including a transparency mode, and a standalone adaptive configuration. These all work effectively, and although you won’t get absolute top-tier noise-crushing abilities here, the HDB 630 were able to keep me pretty focused on my music during a flight and when working at my office.

One thing that I wish was a little more tweakable, though, is the touch controls. Some of these function decently, but a couple feel a little clumsy to use, like volume adjustment and a single-touch play/pause option. Similarly, the On-head Detection is very sensitive, and the cans sometimes turn on even with a small knock. All of this can be switched off, but rivals like the Sony WH-1000XM6 offer much more intuitive controls.

Back to the positives though. Something that really wowed me about the HDB 630 was their excellent battery life. Considering a lot of high-level rivals in this range only offer around 30 hours of playtime, the 60 hours you get here – with ANC on, by the way – is absolutely exceptional. I barely ever had to charge these cans during my month of testing, and that in itself is a massive benefit.

In fact, other than the slightly unrefined touch controls, most of my criticisms are minor. I experienced a few inconsistencies with mic quality when using the BTD 700 dongle, and I would say that these aren’t quite the comfiest cans ever. But still, they’re snug enough to keep on for longer listening sessions, and without the dongle, the mic quality is very good.

Overall, these cans make a spectacular wireless debut into Sennheiser’s beloved HD6XX line. They supply revealing, immersive audio, buckets of playtime, and a rich set of features. Sure, there are a few imperfections here and there, but if we’re talking sound for pound (or dollar, etc.) value, then the Sennheiser HDB 630 are a tempting option, and easy to recommend.

Sennheiser HDB 630 review: price & release date

• $499 / £399 / AU$999
• Launched in October 2025

The Sennheiser HDB 630 were revealed at the beginning of October 2025, and are available to order now. They’re the first wireless pair of headphones to join Sennheiser’s beloved 6XX range, rather than slotting into the Momentum or Accentum family, but they feel like a natural upgrade over the Sennheiser Momentum 4 Wireless, sonically speaking.

As a premium pair of wireless headphones, these come with a fairly high price tag. They’ll set you back $499 / £399 / AU$999, which is in a similar ballpark to top-tier wireless options like the Sony WH-1000XM6 and Bowers & Wilkins Px7 S3 – more on both of those later.

Sennheiser HDB 630 review: specs

Sennheiser HDB 630 review: features

• Well-engineered adaptive ANC and passthrough modes
• Fleshed-out companion app with parametric EQ and crossfeed
• Comes with Sennheiser BTD 700 transmitter for better Bluetooth audio

When it comes to features, Sennheiser has put a lot of care into delivering just about everything you could want from wireless headphones.

Let’s start with some of the flashy inclusions that you’re not going to find from most rivals. First up, we’ve got parametric EQ. This grants users with granular control over the frequency they want to change, along with gain and Q-factor. So, if you’ve got a very precise sound in mind, you’ll easily be able to adapt the headphones to it.

In my experience, parametric EQ worked very nicely, and there are clear instructions in the Sennheiser SmartControlPlus app for how to get the best out of it. I generally stuck with the default sound, but tried making an altered tuning with a slight low-end bump, which was fun to configure.

Next, let’s talk about crossfeed – something I’d never used on a rival pair of the best over-ear headphones. Essentially, this can be used to blend the left and right audio channels for a more balanced presentation – especially useful if a recording has extreme channel separation and most of the bass only plays from the right side, say.

I tried this feature out with Purple Haze by Jimi Hendrix – a man who loved to move sound across the stereo field for a unique listening experience. When cranking crossfade up to high, vocals – which initially were focused into the right channel – were significantly more balanced. Personally, I had no issue with the original sound, so I rarely used crossfeed, but it does work well, and I’m sure some will enjoy using it.

Perhaps the star feature of the HDB 630 is their higher-res Bluetooth audio support. To make use of this, you can plug in the included BTD 700 dongle, which opens up access to aptX, aptX HD, and aptX Adaptive codecs – even if you’re on iPhone.

Anyway, the BTD 700 will let you stream audio in higher-than CD quality – 24-bit / 96kHz (albeit with some loss incurred by Bluetooth transmission itself). That means that great quality music becomes available to just about any modern device – more on the actual audio performance later, though.

Another one of the HDB 630’s major features is active noise cancellation. I was very pleased with the overall performance here, even if it won’t compare to leading players in this field, like the Bose QuietComfort Ultra Headphones Gen 2. One small thing: the HDB 630 set the ANC level to 60% by default, perhaps for the ideal balance sonically, but for testing purposes I cranked this up to 100%.

On a flight to Copenhagen, the low rumble of the jet engine was massively subdued, while discussions around me were basically inaudible. And that was when listening to music at about 60% volume, by the way. Some higher pitched sounds – like the click of seatbelts – did creep through, but I was still impressed with the HDB 630’s noise nixing talents.

Adaptive mode is dynamic and effective too, but you can also access a transparency mode with the custom settings. This is an ideal selection if you’re someone that prefers to have a good measure of your surroundings. There’s also an option to turn on anti-wind noise, or simply turn noise cancelling off entirely.

Sound zones is another interesting feature that enables you to set an EQ preset and ANC level depending on your location. You can save a number of locations, and the headphones will seamlessly slip into your chosen settings, so long as you’re within a certain radius of the relevant area.

A quick word on battery life too. You get an outstanding 60 hours of playtime from the HDB 630, even with ANC on. That’s very impressive indeed, and matches the battery life of the five-star-rated Sennheiser Momentum 4 Wireless.

One key issue I ran into during my time with the HDB 630, was that call and recording quality would suffer significantly if I was using the BTD 700 dongle. Similarly, if I ended a call, when my music continued to play it sometimes sounded fuzzy. The SoundConnectPlus app would also sometimes fail to work when I had the dongle inserted, though this wasn’t always the case. These issues may well be solvable with updates and such – but the call quality issue was especially unfortunate, as without the dongle, call quality on the HDB 630 is strong.

All in all, though, there’s just so much to sink your teeth into on the HDB 630, and if you want highly customizable listening experiences, it doesn’t get much better than this.

• Features score: 4.5/5

Sennheiser HDB 630 review: sound quality

• Immersive, detailed audio performance
• Audiophiles will likely appreciate more neutral default tuning
• Hi-res audio sounds fantastic with BTD 700 transmitter

Now, for anyone familiar with Sennheiser’s name, you’ll know that the company is known for knocking out stellar sounding audio gear time after time. And the HDB 630 continue that trend. I was very impressed with the clarity, detail, and width of the audio these headphones conjure up — and at this price, you’re not going to find a lot of rivals that do better.

The HDB 630 have a pretty neutral sound out of the box. Bass is punchy, but not overly assertive, with a significant dip in the sub-100Hz range compared to the Momentum 4. Mids never get drowned out, with vocals often given a lift thanks to a slight bump in the upper mid-range. Meanwhile, treble is perhaps a little more tempered than I’m used to on a lot of wireless headphones, but this results in a controlled presentation, with sounds in the upper-range never coming across as over-eager or tinny.

When listening to Black Eye by Allie X, I was impressed with the brilliantly defined, assertive vocals, which were carefully separated from the pumping low-end and electronica in the background. Finer details like light percussion came through clearly, while electric guitars in the lower mid-range – which can sometimes sound muddied with middling or poor quality cans – were given a fair amount of room to play.

Rains again by Solji – a softer ballad – was the exact kind of track the HDB 630 could excel with. The higher-pitched vocals floated were beautifully emotive and well-positioned in the mix, with soft acoustic guitars, as well as soft strings and keys all replicated in a tonally accurate, expressive manner.

Turning to a deeper track like Spaceship by Marsolo, this is where things may require some tweaking. The ambient sounds and almost otherworldly effects that enter into the track were exceptionally clear and well-positioned, though the bass itself – despite being rapid and responsive – lacked a little bit of bite for my personal taste.

Thankfully, this wasn’t too much of an issue, though. There is a bass boost toggle for moments where you want a low-end lift in a pinch, and extensive EQ presets and custom options if you want a deeper tuning.

I tried my own custom tuning, using parametric EQ, and Left And Right by D’Angelo sounded incredibly immersive, thanks to the controlled, texture bass, expertly layered vocals, and impactful yet disciplined percussion in the treble range. The wide soundstage created an almost three-dimensional listening experience, and that’s something that a fair few rivals in this price range can’t offer.

For reference, I spent the majority of my time listening with the BTD 700 dongle and the aptX Adaptive codec – this genuinely makes a difference with the HDB 630, opening up a more full-sounding, revealing listen. I also tried wired listening, and was again delighted with the responsive, elegantly balanced performance of the HDB 630. These are an excellent-sounding pair of headphones for the cost – they deliver exactly what they aim to: audiophile-friendly sound, without the cable.

• Sound quality score: 5/5

Sennheiser HDB 630 review: design

• Wired headphone vibe, wireless design
• Could look a little more premium, in my view
• Touch controls and auto-on feel a little clumsy

It’s been an almost perfect start for the HDB 630 so far, but the design department is where the picture is a little bit more mixed.

First up, let’s talk about looks. The HDB 630 have an appearance that’s befitting of their purpose. Visually, they’re almost more like closed-back wired headphones, minus the wires – and I’m a fan of that synchronicity.

However, for me, they just don’t look quite as premium as I’d hope for headphones in this price range. The silver sections that connect the headband to the earcups have an almost plasticky look, which contrasts the luxurious-looking headband and leatherette earcups. They still look pretty good overall, and this is largely a matter of personal preference – but I think some rivals, like the Bowers & Wilkins Px7 S3 have a sleeker overall aesthetic.

Something that’s less subjective, however, is the quality of touch controls on the HDB 630. Personally, I’m a touch controls guy – controversial, I know. But I didn’t always find them to be intuitive here. When flicking up, volume would occasionally rise too drastically, and the single touch requirement to pause music meant that it was too easy to accidentally play or pause my tunes.

Unfortunately, touch controls can’t be customized – it’s either on, or off – which is a bit of a shame, as I would’ve liked to try tailoring them to my preferences. To give the HDB 630 their flowers, some functions, like skipping or returning to the previous track, worked great. Call controls functioned well too.

It was a similar story with On-head Detection, which seemed a little clumsy. On a couple of occasions, I’d give the headphones a knock when they were on my desk, and they’d auto power-on, connect to my phone, and start playing my music out. That was a little frustrating, and led to me later turning the feature off, even though the smart pause function worked really nicely when removing or re-wearing the headphones.

On the positive side, these headphones are fairly comfortable for longer listening sessions. I definitely think that my day-to-day headphones, the Sony WH-1000XM6 feel lighter and comfier in-use, but the HDB 630 didn’t feel tight on my head or harsh on my ears. They also offered a secure fit during my flight and whenever I was out and about.

Unlike headphones such as the Sony WH-1000XM4, the HDB 630 don’t fold up. That means they’re not the most compact around. But when you need to take them out and about, you can make use of the included carry case, which is built to a high standard. It feels very durable, and is well protected against scuffs or scratches. It’s a little large and uses a zip rather than my preference of magnets, but it’s still a very welcome inclusion.

• Design score: 3.5/5

Sennheiser HDB 630 review: value

• Fairly priced for the sound quality on offer…
• …even if you can get better ANC and comfort from some rivals
• Incredible feature-set, even against competitors

When it comes to value for money, the Sennheiser HDB 630 score nicely – yes, even though they’re not the cheapest headphones out there.

For the money you pay, you get absolutely wonderful sound quality, and the inclusion of the BTD 700 dongle opens up higher-res Bluetooth listening to anyone – even iPhone listeners, who are frequently left behind in that domain.

Even in a side-by-side comparison with my similarly priced Sony WH-1000XM6, I felt that the HDB 630 performed exceptionally, offering a slightly more open, revealing sound. The XM6 arguably have a more ‘exciting’ profile out of the box, but with a little tuning, there’s not much the HDB 630 can’t do.

Looks-wise and comfortability-wise, the HDB 630 are solid – not the best in class but certainly not bad. But they sure do stand out when it comes to features. Parametric EQ, crossfade, adaptable ANC, and a ton of battery life. All of that combined with the sound you get? That’s plenty of bang for your buck.

• Value score: 4.5/5

Should I buy the Sennheiser HDB 630?

Buy them if…