





🎶 Hear every detail, feel every beat — audiophile luxury redefined.
The Sennheiser HD 660S2 headphones combine German precision engineering with Irish assembly to deliver an ultra-wide 8Hz–41.5kHz frequency response and 300 Ohm impedance for crystal-clear, distortion-free sound. Featuring a lightweight 38mm aluminum voice coil and airflow-optimized open-back design, these headphones provide deep sub-bass impact and a spacious soundstage. Plush velour ear cushions and ergonomic design ensure premium comfort for extended listening, while included balanced and unbalanced cables plus a 2-year warranty make them a versatile, reliable choice for discerning audiophiles.






| Noise Control | None |
| Frequency Response | 41500 Hz |
| Headphones Jack | 3.5 mm Jack |
| Model Name | HD 660S2 |
| Connectivity Technology | Wired |
| Included Components | 6.3 mm cable (1.8 m), 4.4 mm cable (1.8 m), 6.3mm to 3.5mm adapter, HD 660S2 headphones, Protective Case |
| Age Range (Description) | Adult |
| Material | Aluminium |
| Compatible Devices | Cellphones, Gaming Consoles, Laptops, Music Production Equipment, Portable Media Player, Tablets |
| Control Type | Media Control |
| Cable Feature | Detachable |
| Item Weight | 260 Grams |
| Frequency Range | 27.5 Hz - 41,500 Hz |
| Net Quantity | 1 Count |
| Control Method | Touch |
| Number of Items | 1 |
| Cable Length | 180 Centimetres |
| Audio Driver Type | Dynamic Driver |
| Earpiece Shape | Over Ear |
| Series number | 660 |
| Special Feature | Audiophile Stereo Headphones |
| Global Trade Identification Number | 04260752330374 |
| Manufacturer | Sennheiser, Sennheiser electronic gramsbH & Co. kilograms. Am Labor 1. DE - 30900 Wedemark Germany |
| Model | 700240 |
| Model Year | 2023 |
| Item model number | 700240 |
| Special Features | Audiophile Stereo Headphones |
| Batteries Included | No |
| Batteries Required | No |
| Cable feature | Detachable |
| Includes Rechargeable Battery | No |
| Manufacturer | Sennheiser |
| Country of Origin | Ireland |
| Item Weight | 260 g |
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