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The Sennheiser HD 660S2 are premium open-back over-ear headphones featuring 42mm dynamic drivers and a wide 8 Hz to 41.5 kHz frequency range. Designed for audiophiles and professionals, they deliver precise highs, rich mids, and deep bass with exceptional comfort thanks to breathable ear cushions. Crafted with durable aluminum in Germany and Ireland, these wired headphones include detachable cables and multiple jack options for versatile use across music, gaming, and podcasting.






| Control Method | Touch |
| Control Type | Media Control |
| Unit Count | 1.0 Count |
| Item Weight | 630 Grams |
| Water Resistance Level | Not Water Resistant |
| Is Electric | No |
| Antenna Location | music |
| Compatible Devices | Smartphone |
| Cable Features | Detachable |
| Additional Features | stereo pairing |
| Enclosure Material | Aluminum |
| Specific Uses For Product | Music |
| Headphone Folding Features | Over Ear |
| Earpiece Shape | Oval |
| Headphones Ear Placement | Over Ear |
| Style Name | Headphones |
| Theme | Music |
| Color | Black |
| Connectivity Technology | Wired |
| Headphone Jack | 1/4 inch TRS, 4.4 mm TRRRS |
| Frequency Range | 8 Hz - 41.5 kHz |
| Audio Driver Type | Dynamic Driver |
| Audio Driver Size | 42 Millimeters |
| Impedance | 300 Ohm |
| Noise Control | Sound Isolation |
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