The perfect blend of power and control. The powerhouse open-back headphoneConnects you to the deepest corners of your music collection
A Direct Connection To Your Music
Known for their engaging signatures and liquid-smooth response, HD 660S predecessors HD 650 and HD 600 shattered performance barriers in the audiophile headphone category.
The HD 660S transcends the best of that storied DNA with supernatural speed and effortless instrument reproduction—even at the bookends of the frequency spectrum. Utilizing an all-new transducer and specially ventilated drive unit, the HD 660S delivers the revealing, tack-sharp detail audiophiles demand without sacrificing the engaging dynamics that make music so enjoyable.
From Sennheiser’s ears to yours!
In just one listen you will understand why the HD 660S is so special. Thousands of listening sessions later its purpose is even clearer.
What you hear each and every time is the result of an open-back earcup mated to a new transducer tuned for the modern audiophile. Its speedy response is perfectly suited for reproducing those frequency-stretching recordings with confidence. Thanks to an aluminum voice coil, the 38mm diaphragm remains nimble for ultra-quick impulse fidelity across the board. This activation and rest behaviour unlocks the capability to communicate tonal and spatial characteristics precisely.
It’s all about connection
Sennheiser packed your HD 660S with a versatile set of essential cables, each one impedance-matched with ultra-low capacitance.
The ¼-inch / 6.3mm stereo connector offers the audiophile-standard plug for connection to devices such as headphone amplifiers and A/V receivers, digital audio players, analog gear, and more. A balanced, 4.4mm connector opens a pathway to a newer generation of balanced output devices (headphone amplifiers, digital audio players, etc.) that embrace this compact plug’s superior stability over time. A balanced headphone setup offers an even lower noise floor with great dynamic range when connected to balanced source/amp circuit outputs. The listener will thus experience a wider soundstage, tightly controlled transients and impossibly-clear instrument separation. Each cable is 9.8 feet / 3m long to accommodate unencumbered listening on gear deep within your shelves, or favorite listening chair, and a flexible adapter is included to reduce the 6.3mm to 3.5mm. An optional balanced cable (CH 650 S) is sold separately for simplified connection to 4-pin XLR jacks.
Sennheiser HD660s Specifications
Article number (SKU) 508826
Frequency response (speaker) 9 Hz – 41,500 Hz
Sound pressure level (SPL) 104 dB (1 V)
Impedance 150 Ω
Total harmonic distortion (THD) < 0.04% (1 kHz, 100dB)
Cable length 3 m
Adapter stereo jack plug, gold-plated 1/4″ (6.35 mm), unbalanced, 3-pin 4.4 mm, balanced, 5-pin
Transducer principle dynamic, open
Weight 260 g
Connector stereo jack plug, gold-plated 1/4″ (6.35 mm), unbalanced, 3-pin 4.4 mm, balanced, 5-pin
Ear coupling circumaural
Magnetic field 4.5 mT