Sennheiser HDB 630 Wireless Headphone Review

This new Sennheiser design is aimed at audiophiles wanting a sonically superior wireless headphone. It comes complete with features like a USB-C transmitter dongle that allows for aptX Adaptive compatibility across devices, the ability to play music at 24-bit/96kHz resolution, plus a 42mm dynamic transducer made at the company’s Tullamore factory in Ireland. So if you’re a stickler for sound quality as well as features, then it may just be what you need.

Up Close

If you’ve experienced Sennheiser’s Momentum 4 true wireless headphones before, then you’ll find this product familiar. The HDB 630 inherits the former’s chassis design, while getting nice new touches like silver-finished headphone yokes, plus a new type of leatherette for the top of the headband. All of which gives this product a swisher feel than the Momentum 4.

The earcups use the same premium PU leather and dense memory foam cushions found on Sennheiser’s acclaimed MOMENTUM 4, offering excellent comfort and long-term durability. The headband, meanwhile, is wrapped in Japanese protein leatherette for an added touch of luxury. During extended listening sessions — four hours or more — the HDB 630 Wireless remained exceptionally comfortable, with no noticeable crown pressure or clamping fatigue. The only caveat is heat build-up in warmer climates such as Singapore, where limited breathability can lead to a touch of ear perspiration. 

The 42mm dynamic transducer is similar to that of the Momentum 4 in terms of materials, but is manufactured in the Tullamore factory with some detail changes, such as a new acoustic mesh and deeper back volume. The dust cover has also been enhanced, which Sennheiser says provides increased acoustic transparency for superior high-frequency performance.

Just like the Momentum 4, you get a single button on the right earcup for power, activating the Bluetooth pairing mode and toggling between standard and high-resolution audio quality. There’s a bunch of accessories, such as a USB-C to USB-C cable for charging and wired listening, a 3.5mm to 2.5mm cable for wired listening, a flight adapter and the BTD 700 USB-C transmitter dongle.

The latter is a nice addition, since it allows devices without aptX compatibility, such as iPhones, to transmit in aptX Adaptive. This has the added benefit of both lower latency (down to 30ms in Gaming Mode) if you’re playing games, as well as the ability to support up to 24-bit/96kHz, according to Sennheiser. I plugged this adapter into my PC to test the wireless connection out with games like Assassin’s Creed Mirage and PUBG: Battlegrounds, and got great results.

The Sennheiser Smart Control Plus app is definitely needed, at least for initial setup. There’s a new Parametric Equaliser with adjustable Q controls, filters, an A/B toggle and more. Sennheiser is also planning to let users easily share their presets with others via a QR code generation feature that’s set to launch later in 2025.

The touch controls can also be adjusted here, although I found them perfectly intuitive and sensible out of the box. One nice feature is that you can adjust the level of ANC or transparency right from the touch controls, simply by pinching in or out on the touch panel. I was worried that it would be hard to remember, in addition to all the other swipes and taps, but again, Sennheiser has done a nice job. I could associate a pinch-in with pulling an imaginary bubble smaller, which was to raise the ANC level. A pinch-out could be thought of as expanding the bubble, meaning you’re raising the transparency level to let more sound in. A quick double-tap switches between ANC and transparency. All in all, it’s well thought out.

Sadly, there are only sixteen volume steps when using the touch panel or your phone’s volume buttons to control the volume, so if you require more granular volume control, you’ll have to do it from the phone screen. The app is also needed to switch from Standard to High Resolution for audio quality in the beginning, before you can switch with the button on the right earcup. And of course, other niceties like firmware updates, multipoint connection management and Sennheiser’s Sound Zones must be managed through the app as well.

A sturdy hard-sided carrying case is included to protect the headphones – this is about the same size as the Momentum 4’s, so it's rather large. This is mostly because the earcups aren’t able to fold in on themselves, and only swivel inwards. You get up to 60 hours of playback time, and there’s a quick charge feature for seven hours of battery life from a quick ten-minute boost.

The Listening

If you’ve been wanting a neutral-tuned wireless headphone from Sennheiser, this will fit the bill. You will immediately notice a less boosted bass response than most rivals, as well as a smoother, more accurate sound. The HDB 630 can run over Bluetooth as well as through a USB-C connection with the headphones powered on, and I tested both. My impressions are based on the Bluetooth experience using the included BTD 700 transmitter, so you can get hi-res audio with aptX Adaptive, but note that the USB-C connection provides even better detail, clarity and dynamics. This is recommended for the best possible sound.

Starting with the bass, you’ll immediately notice that it’s more neutral than the Momentum 4 – excellent news for audiophiles who have long been used to having to tweak the EQ to remove bass. For example, the bottom end is no longer as boomy in Billie Eilish’s Bad Guy, allowing you to catch subtle details like the vocal layering and synths in the background.

The midrange is similar to the Momentum 4, but thanks to the toned-down bass, it feels more prominent in the mix. Songs like Wish I Knew You by The Revivalists sound beautiful, with fine resolution and accurate timbre. It’s also much easier to pick out the background sounds in songs like Ariana Grande’s Breathin’.

Treble is also slightly smoother, although it’s easy enough to give this region a little bump in the PEQ to add back a bit more sparkle. Listening to Across the Stars (Love Theme from “Star Wars: Attack of the Clones”) by The London Symphony Orchestra was a delight, with the strings coming across beautifully and contrasting perfectly with brass instruments.

Thanks to the angled drivers inside, you get a relatively wide soundstage that offers good stereo imaging and accuracy, even if the headphones are only running on Bluetooth. Kacey Musgraves’ Star-Crossed is a track that benefits from this, allowing for plenty of air and space to really let her vocals shine front and centre while being supported by the male backing vocals and instrumentals.

The Verdict

Sennheiser’s new HDB 630 headphone might be slightly more expensive than the Momentum 4, but when you consider that you get the BTD 700 dongle included, it pretty much evens out. The question here really is – what kind of sound signature do you enjoy? If you’re a fan of bass and treble boost, then the Momentum 4 can be found at hefty discounts these days. But if you value a neutral sound and the ability to listen to music in true hi-res, then the HDB 630 is a fantastic choice.

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