Field Test · Studio Gear Review
Sennheiser HD 650
In-depth technical assessment of Sennheiser’s acclaimed HD 650 model
Sennheiser
- Headphones
- Open-backed design for increased enjoyment
- For editing, mastering, or simply listening
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Spec Sheet
- Dynamic
- Open-back
- Impedance: 300 Ohm
- Sound pressure level: 103 dB
- Frequency range: 10 – 41,000 Hz
- 3 m Cable with 6.3 mm stereo jack plug
- Weight without cable: 269 g
- Weight with cable: 346 g
- Includes 20 cm adapter cable from 6.3 mm to 3.5 mm jack plug
Studio Log
| Available since | September 2019 |
|---|---|
| Item number | 471755 |
| Sales Unit | 1 piece(s) |
| Design | Over-Ear |
| System | Open |
| Impedance | 300 Ohms |
| Frequency range | 10 Hz – 41000 Hz |
| Adapter | Yes |
| Replacable Cable | Yes |
| Marrone/Argento | Black |
| Max. SPL | 103 dB |
| Sensitivity | 103 dB |
| Type Of Connector | Jack, mini-jack |
| Adaptor | Yes |
| Weight | 269 g |
| Replaceable Cable | Yes |
| Colour | Black/Gray |
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Customer Review Summary
Sennheiser HD 650 Overview
Released in September 2019, the Sennheiser HD 650 continues to be a benchmark for open-back headphones in the mid-range price segment. Retailing at approximately £319, these dynamic, over-ear headphones feature a 300 Ohm impedance and a broad frequency response spanning 10 Hz to 41,000 Hz. Their open design promotes natural sound reproduction, making them a popular choice for audiophiles, music producers, and sound engineers alike.
Design and Build Quality
The HD 650’s construction utilises predominantly black and grey plastic paired with fabric earpads. At 269 grams (excluding the 3-metre cable), the headphones are relatively lightweight, contributing to their renowned comfort during extended listening or mixing sessions.
Despite the solid feel, some users have noted that the glossy plastic surfaces attract fingerprints and are prone to light scratches. The proprietary two-sided cable connector is functional but limiting for replacements, with an included 6.3 mm jack and 3.5 mm adapter providing compatibility with various sources. The supplied cable design splits to each earcup, which might cause minor discomfort for some users, especially during movement.
Comfort and Wearability
Extensive user feedback highlights the HD 650 as one of the most comfortable headphones on the market, allowing several hours of use without significant fatigue. Branded as narrow-fitting, they exert a firm clamping force, which some find a drawback initially; however, this tension often eases with break-in. Their oval earcups accommodate different ear shapes well and are particularly noted for compatibility with glasses wearers.
Sound Signature and Performance
The HD 650 is acclaimed for its neutral and natural sound signature, exhibiting a well-balanced tonal curve. The bass response is tight and well-defined, described by listeners as “dry” and impactful without overpowering the mids and highs. Midrange frequencies are especially praised for their clarity and warmth, rendering vocals and instruments with an organic presence that many find immersive and fatigue-free.
High frequencies are smooth and airy, avoiding harsh sibilance or spikes often present in competing models. The soundstage, while not as expansive as some AKG or planar magnetic headphones, provides an intimate and precise spatial image suitable for critical listening and mixing.
Technical Highlights
- Frequency range: 10 Hz to 41 kHz, allowing reproduction beyond the standard audible band
- Impedance: 300 Ohms, requiring moderately powered sources to reach optimal volume and dynamic range
- Sensitivity: 103 dB SPL, fairly efficient for high-impedance headphones
- Maximum sound pressure level: 103 dB, suitable for professional monitoring without distortion
Usage and Driving Requirements
While often considered demanding due to their 300 Ohm impedance, the HD 650 can be driven to satisfactory volume levels by many modern laptop sound cards or interfaces. Nevertheless, usage with a dedicated headphone amplifier is recommended to unleash their full dynamic and tonal potential.
Users employing audio interfaces such as the RME Babyface or DAC/amps note that these headphones deliver excellent clarity and detail with minimal need for equalisation, although some prefer minor correction tools like Sonarworks Reference to compensate for slight bass roll-off.
Applications and Suitability
The HD 650 excels in analytical listening environments including mixing, mastering, and music production. The faithful frequency response enables accurate assessment of tracks without artificial coloration, making them a reliable reference tool in studios.
For casual or home listening, the open-back design offers an immersive experience akin to a live performance, especially with genres like pop, rock, R&B, and electronic music. However, their lack of isolation and sound leakage mean they are unsuitable for noisy environments or public use.
Pros and Cons
- Pros: Exceptional midrange and vocal clarity, well-integrated bass, smooth treble, comfortable for long sessions, replaceable cables, wide frequency response
- Cons: Moderate clamping force may require break-in, proprietary cable connectors limit third-party options, plasticky aesthetic and finish, open-back design unsuitable for noisy surroundings
Conclusion
The Sennheiser HD 650 remains a revered classic, more than two decades after its inception. Its combination of natural tonality, balanced spectrum, and comfort justifies its status as a favourite among both professionals and discerning listeners. Despite some build material considerations and the need for a suitable amplifier to drive them properly, their sound quality places them at the forefront of open-back headphones under £350.
Whether as a mixing reference or a music enjoyment tool, the HD 650 delivers enduring value and musical insight. Users seeking a refined, neutral listening experience with an emphasis on vocal detail will find this model particularly rewarding.
