Informations
Product description
The HD 660S2 is a high-end open-back headphone designed for audiophiles and critical listeners seeking deep bass, detailed resolution and a spacious soundstage. It features a reworked driver and improved airflow design to deliver natural, dynamic sound with enhanced low-end and clarity across the entire frequency range. Comfortable and built with premium materials, it’s ideal for long listening sessions, hi-fi systems, DAC/amp setups, or studio-like listening environments.
Key Features
• Open-back, over-ear design for wide, natural soundstage
• Dynamic driver with updated voice coil and airflow for deeper bass and low distortion
• Extended frequency range for accurate reproduction of bass/sub-bass and detailed highs
• Detachable cords with both balanced and unbalanced options (jack 6.35 mm + balanced 4.4 mm) for flexibility
• Lightweight and comfortable build — suitable for long listening sessions
• Designed for hi-fi listening, detailed music playback, mixing or mastering
Specifications
| PRODUCT | Sennheiser HD 660S2 Headphones |
| Design | Open-back, over-ear (circumaural) |
| Transducer Type | Dynamic, 38 mm driver |
| Impedance | 300 Ω |
| Frequency Response | 8 Hz – 41,500 Hz |
| Sound Pressure Level (SPL) | 104 dB (1 kHz, 1 V RMS) |
| Total Harmonic Distortion (THD) | < 0.04% @ 1 kHz / 100 dB SPL |
| Ear Coupling | Over-ear, open-back |
| Cable | Detachable (balanced 4.4 mm + unbalanced 6.35 mm) |
| Weight | 260 g |