Sennheiser HD 650 Open-Back Headphones

Experience legendary audio performance with the Sennheiser HD 650 — a gold standard in audiophile listening. Praised for its musical, non-fatiguing sound signature, the HD 650 presents each note with intimate precision and lifelike warmth. Its open-back design and finely-tuned drivers reveal exceptional tonal balance across bass, mids, and treble, making it ideal for extended, immersive listening sessions without fatigue. Whether rediscovering your favorite albums or exploring high-resolution audio, the HD 650 offers a true-to-source sound that elevates every detail.

Crafted in-house with meticulous driver matching and precision voice coils, the HD 650 ensures channel-to-channel consistency and mastering-grade performance. The 42mm dynamic transducers with a 38mm diaphragm and aluminum voice coils deliver extended frequency response and clean impulse behavior. Built with comfort in mind, it features soft padding, balanced clamping force, and a lightweight design. It includes a high-quality oxygen-free copper Y-cable with 1/4" TRS and 3.5mm adapter — all engineered for transparency and reliability in your hi-fi setup.

Specifications

• Earpiece Design: Over-Ear (Circumaural), Open-Back
• Driver Type: 42mm Dynamic with Copper-Clad Aluminum Voice Coil
• Impedance: 300 Ohms
• Frequency Response: 10 Hz – 39 kHz
• Sensitivity: 103 dB SPL (1 kHz / 1 Vrms)
• Maximum Power Handling: 500 mW
• Total Harmonic Distortion (THD): 0.05%
• Contact Pressure: 6.0 N
• Audio Connector: 1 x 1/4" TRS (with 1/8" / 3.5 mm adapter included)
• Cable Type: 3 m (9.8 ft) Y-Type, Straight, Detachable
• Connector to Earpiece: 2 x 2-Pin
• Cable Material: Oxygen-Free Copper
• Weight: 260 g (9.2 oz) without cable
• Environmental Protection: None
• Foldable Design: No
• Swivel Earcups: No
• Packaging Dimensions: 12.7 x 10.15 x 4.35"
• Package Weight: 1.35 lb

Expanded Key Features List

• Signature Non-Fatiguing Sound: Warm, detailed, and musical sound ideal for long listening sessions without ear fatigue.
• Open-Back Audiophile Design: Natural acoustic reproduction and expansive soundstage ideal for reference-level listening.
• Precision-Matched Drivers: Each transducer is paired for ±1 dB channel consistency to ensure balanced stereo imaging.
• 42mm Dynamic Driver Unit: Large diaphragm paired with aluminum voice coil offers extended frequency response and fast transients.
• 300 Ohm Impedance: Engineered for optimal performance with dedicated headphone amplifiers and hi-fi gear.
• Comfort-Driven Fit: Lightweight frame with 6.0 N clamping pressure and soft ear padding allows for hours of fatigue-free use.
• High-Quality OFC Cable: Detachable Y-cable with oxygen-free copper wiring ensures minimal signal loss and long-term durability.
• Includes 3.5mm Adapter: Comes with 1/4" to 3.5mm adapter for flexible connection to various sources.

Q&A Section

Q: What kind of sound signature does the HD 650 have?
A: The HD 650 offers a warm, natural, and smooth sound that’s non-fatiguing and perfect for long listening sessions, especially in classical, jazz, and vocal genres.

Q: Is the HD 650 suitable for mixing or mastering?
A: Yes, it provides highly accurate sound reproduction with tightly matched drivers, making it a reliable choice for critical listening and audio production.

Q: Do I need an amplifier for the HD 650?
A: Due to its 300-ohm impedance, a dedicated headphone amplifier is strongly recommended to drive the HD 650 to its full sonic potential.

Q: Can I use the HD 650 with mobile devices?
A: While technically possible, mobile devices typically lack the power required to properly drive these headphones — a DAC/amp combo is recommended.

Q: How comfortable is the HD 650 for long sessions?
A: Extremely comfortable — its ergonomic headband and velour earpads provide gentle pressure and excellent cushioning even during marathon listening.

Q: Does it have noise cancellation?
A: No, the HD 650 is an open-back headphone and does not include active or passive noise cancellation. It’s designed for quiet listening environments.

Q: Are the cables detachable and upgradeable?
A: Yes, the HD 650 uses a detachable Y-cable with standard 2-pin connectors, making it easy to upgrade or replace.

Q: Where is the HD 650 manufactured?
A: The HD 650 is manufactured in Ireland with high-quality materials and strict quality control standards.