By: Dipin Sehdev

Sennheiser is taking a confident swing at the premium wireless headphone market with its new HDB 630, a $499 USD over-ear model that blends studio-grade fidelity with travel-ready comfort and thoughtful usability. Positioned squarely against the Sony WH-1000XM6 (92% CE Critic Score), Bose QuietComfort Ultra, Apple AirPods Max (86% CE Critic Score), and Bowers & Wilkins Px8 S2 (90% CE Critic Score), the HDB 630 aims to appeal to listeners who want the nuance of wired audiophile listening—without being tethered to a cable.

With support for 24-bit/96kHz high-resolution playback, aptX Adaptive, and a bundled BTD 700 USB-C transmitter dongle for instant hi-res wireless connectivity, Sennheiser is clearly out to prove that wireless convenience doesn’t have to mean sonic compromise.

Built for Serious Listening

Rather than reinvent the wheel, Sennheiser based the HDB 630 on the proven chassis of its best-selling MOMENTUM 4 (85% CE Critic Score) headphones. The familiar form factor has been refined inside and out. Internally, the HDB 630 features a custom acoustic system centered around a new 42mm dynamic transducer, hand-assembled at Sennheiser’s Tullamore facility in Ireland—the same site responsible for the company’s most respected headphone drivers.

Sennheiser says the goal was simple: deliver the transparency, imaging, and tonal balance that audiophiles expect from wired setups—now in a fully wireless format. “We designed the HDB 630 for listeners who expect the same fidelity from their wireless headphones as they do from their wired setups—just without the leash,” said Wee Hong Kuan, Senior Product Manager at Sennheiser.

The tuning is deliberately flat and natural, emphasizing texture over flash. Early impressions suggest a controlled low end, articulate mids, and a crisp but fatigue-free treble. At 311 grams, the headphones feel substantial without being heavy, with memory foam earpads covered in Japanese Protein Leatherette from IDEATEX—chosen for its softness, breathability, and durability.

High-Resolution Revolution

Where the HDB 630 truly flexes is in its digital audio architecture. This headphone supports up to 24-bit/96kHz playback through its USB-C port, letting users bypass Bluetooth entirely for true hi-res wired listening. For analog purists, a 3.5mm input remains included.

Wireless playback is handled by Bluetooth 5.2, with codec support for SBC, AAC, aptX, aptX HD, and aptX Adaptive. The absence of LDAC, Bluetooth LE Audio, or aptX Lossless might disappoint some spec-sheet chasers, but Sennheiser’s approach here is pragmatic—focusing on the codec most widely compatible across Android, Windows, and select Apple devices.

The inclusion of the BTD 700 USB-C dongle makes a real-world difference. It instantly upgrades smartphones, tablets, and computers that don’t natively support aptX Adaptive, allowing high-resolution transmission up to 24-bit/96kHz. Considering only about 16% of current smartphones support hi-res Bluetooth natively, this small dongle effectively levels the playing field for the remaining 80%.

In short, Sennheiser didn’t just build a headphone—it built a mini ecosystem for high-resolution audio.

Smarter Sound: Sennheiser Smart Control Plus

Hardware aside, one of the most meaningful upgrades comes from the software side. The HDB 630 introduces the next-generation Sennheiser Smart Control Plus app (for iOS and Android), which brings a suite of advanced sound-shaping tools.

The new Parametric Equalizer (PEQ) allows users to fine-tune specific frequencies, select filter types, and adjust Q bandwidth—features typically reserved for studio gear. Unlike most headphone EQs, the PEQ operates on the headphone’s internal DSP, ensuring the tuning applies universally across all connected devices and apps.

There’s also a Crossfeed mode, inspired by Sennheiser’s $60,000 HE 1 reference system, which gently blends the left and right channels to recreate the natural spatial experience of loudspeakers—especially useful for older stereo mixes.

Users can even share EQ presets with other HDB 630 owners, and Sennheiser plans to add QR code sharing in a future firmware update. It’s a small but clever nod to the growing community of enthusiasts who treat tuning curves like collectibles.

Beyond sound shaping, the app allows control over Adaptive Noise Cancellation (ANC) intensity, on-head detection, and codec preferences, making it one of the most complete companion apps in the category.

Comfort and Noise Control Done Right

Comfort has long been a Sennheiser strength, and the HDB 630 is no exception. The over-ear design combines lightweight materials with a refined clamp pressure that should suit extended sessions—be it in the office, on a flight, or at home with lossless playlists.

The Hybrid Adaptive Noise Cancellation uses multiple microphones per earcup to measure and counteract ambient noise in real time. It’s not as aggressive as Sony’s ANC, but it’s natural-sounding—reducing distractions without introducing noticeable pressure or hiss. Transparency Mode and beamforming microphones also ensure clear voice pickup during calls.

Battery performance is another standout: up to 60 hours of playback with ANC enabled, or 7 hours from a 10-minute quick charge. A full charge takes about 2 hours via USB-C. It’s among the longest-lasting wireless headphones in the category—roughly double the endurance of the AirPods Max and Px8 S2.

Premium Presentation

Every detail of the HDB 630 package reinforces its premium positioning. The headphones ship with:

• Protective travel case

• USB-C charging cable

• 3.5mm analog audio cable

• Airline adapter

• BTD 700 USB-C Bluetooth transmitter

The inclusion of the dongle at this price is notable, considering competing brands often charge $100–$150 for similar accessories.

Fit and finish are also improved compared to the MOMENTUM 4, with subtle upgrades in hinge tolerance and surface texture. It looks less plasticky and feels more engineered—more “Sennheiser Reference” than “Sennheiser Lifestyle.”

Specifications

Price and Availability

The Sennheiser HDB 630 Wireless Headphones are available for pre-order beginning October 8, 2025, at an MSRP of $499.95 USD / €499.90 EUR. Shipping begins October 21, 2025, through authorized retailers and sennheiser-hearing.com.

Early Verdict

At $499, the HDB 630 lands in the sweet spot for premium wireless audio—balancing craftsmanship, battery life, and sonic performance with a focus on usability and customization.

While the omission of LDAC, Bluetooth LE Audio, and aptX Lossless may raise eyebrows, the included USB-C dongle provides a more practical hi-res solution that works across far more devices. Combined with true 24-bit/96kHz capability, exceptional comfort, and class-leading endurance, the HDB 630 shows Sennheiser is finally taking the fight to Sony, Bose, and Bowers & Wilkins—with German engineering leading the charge.