Description
The HD 660S2 is tailored for audiophiles who find the original HD 660S or HD 600 too “thin” or lean in the bass. The key sonic improvement comes from reducing the resonant frequency from 110Hz to 70Hz, resulting in a deeper, more textured, and more engaging low-frequency response.
They retain the “Sennheiser sound”—warm, non-fatiguing, and detailed—while offering a slightly smoother treble response. Their high-impedance 300-ohm driver means they require a dedicated headphone amplifier or a high-quality digital audio player (DAP) to reach their full potential.
Specifications
| Type | Over-ear, open-back, dynamic |
| Frequency Response | 8 Hz – 41,500 Hz |
| Impedance | 300 Ohms |
| Sound Pressure Level (SPL) | 104 dB (1 kHz, 1 Vrms) |
| Total Harmonic Distortion (THD) | < 0.04% (1 kHz, 100 dB) |
| Transducer Size | 38 mm |
| Magnetic Field | 2.5 mT |
| Weight | 260 g |
| Ear Pad Material | Velour |
| Cable Length | 1.8 m (detachable) |
| Connector | 6.35 mm (1/4 inch) stereo jack, 4.4 mm balanced jack |
| Adapter | 6.35 mm to 3.5 mm (1/8 inch) |
Package includes
1 x Sennheiser HD 660S2 Headphones (Black)
1 x 6.35 mm to 3.5 mm Adapter
1 x 1.8 m Cable (6.35 mm/1/4″ plug)
1 x 1.8 m Cable (4.4 mm balanced plug)
1 x Soft Carry Pouch
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