Sennheiser HDB 630 Wireless Headphones - Open Box

All open-box Sennheiser HDB 630s are tested, inspected and cleaned and are sold in like-new condition with their original packaging and accessories.  Enjoy high-resolution, neutral sound — anywhere Meet the Sennheiser HDB 630 Wireless Headphones — a closed-back, over-ear design that delivers true audiophile performance with the freedom of wireless listening. Featuring Sennheiser’s in-house 42 mm transducer, advanced adaptive noise cancellation, and the included BTD 700 Bluetooth® USB-C Dongle, the HDB 630 brings reference-grade sound to your phone, tablet, or laptop. Enjoy up to 60 hours of battery life and studio-level control through the Smart Control Plus App’s parametric EQ and crossfeed tools. Key Features Neutral, high-resolution tuning — 42 mm Sennheiser transducer delivers lifelike mids, precise detail, and an expansive soundstage. BTD 700 Dongle included — unlocks aptX™ HD and aptX™ Adaptive high-res Bluetooth for phones, tablets, and computers. Parametric EQ & Crossfeed — shape your sound and recreate speaker-like imaging using the Smart Control Plus App. Adaptive Noise Cancellation — powerful yet transparent, maintaining dynamics and tonal balance. Multi-connection options — USB-C, analog 3.5 mm, or Bluetooth 5.2 for lossless and wireless flexibility. All-day comfort — 311 g lightweight frame, plush leatherette pads, and up to 60 hours per charge. Designed for true portable fidelity Serious listening no longer requires racks of gear. The HDB 630 redefines portable audiophile sound with the same composure and neutrality enthusiasts expect from Sennheiser’s wired models. Pair the BTD 700 Dongle for instant hi-res performance across platforms and enjoy a complete acoustic chain engineered for balance, clarity, and realism — whether you’re at home, in the office, or on a flight. Precision control with advanced DSP Using the Smart Control Plus App, the HDB 630 gives you full parametric equalization and crossfeed control. Fine-tune frequency ranges, bandwidth, and filter types for exact tonal shaping — from subtle vocal refinement to bass extension. Crossfeed brings a natural stereo image to older recordings while preserving phase integrity, making these headphones uniquely capable for both critical and casual listening. Comfort and endurance for every journey A refined Japanese-leatherette headband, generous earpads, and low clamping force make long sessions effortless. With 60 hours of playback and rapid USB-C charging, the HDB 630 is built for marathon playlists, travel days, and studio-length editing sessions. Sound signature: Neutral done right The HDB 630’s tuning emphasizes fast, controlled bass, lifelike mids, and smooth treble that retains air without fatigue. Compared to the Momentum 4, it’s a more reference-oriented sound — less coloration, more precision, and a wider, more natural stage. Technical Specifications Specification Details Article Number (SKU) 700445 Type Closed-back, over-ear, wireless Transducer Electrodynamic (moving coil) Driver Diameter 42 mm (in-house Sennheiser) Frequency Response 6 Hz – 40 kHz (USB / Line-In / aptX Adaptive) Nominal Impedance 480 Ω (active) Sound Pressure Level (SPL) 105 dB (1 kHz / 0 dBFS) THD < 0.2 % (1 kHz / 100 dB SPL) Resolution Up to 24-bit / 96 kHz (via USB-C or BTD 700) Connectivity Bluetooth 5.2 / USB-C / 3.5 mm analog input Codec Support aptX™ Adaptive, aptX™ HD, aptX™, AAC, SBC Noise Cancellation Adaptive ANC with Transparency mode Battery Life Up to 60 hours (USB-C charging) Weight 311 g (without cable) Ear Pad Material Leatherette (synthetic) Audio Cable 1.20 m detachable 3.5 mm (right side) USB Cable 1.20 m USB-C to USB-C (audio + charging) Included Dongle BTD 700 Bluetooth® USB-C Dongle What’s in the Box HDB 630 closed-back wireless headphones BTD 700 Bluetooth® USB-C dongle 1.20 m USB-C to USB-C audio / charging cable 1.20 m audio cable with 3.5 mm plug In-flight adapter Carrying case Compare to Similar Models Model Design Codec Support Battery Life Sound Signature Price (USD) Sennheiser HDB 630 Closed-back Wireless Over-Ear aptX Adaptive / HD / AAC / SBC Up to 60 hours Neutral Reference Tuning $499 (estimated) Sennheiser Momentum 4 Closed-back Wireless Over-Ear aptX Adaptive / AAC / SBC Up to 60 hours Warm Balanced $379 Bowers & Wilkins Px7 S2e Closed-back Wireless Over-Ear aptX Adaptive / AAC / SBC Up to 30 hours Warm Dynamic $399 Sony WH-1000XM5 Closed-back Wireless Over-Ear LDAC / AAC / SBC Up to 30 hours Smooth V-Shaped $399