| DESIGN AND DIMENSIONS | Sennheiser HD 660 S | - |
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| Product Type | Headphones - wired - 6.35 mm jack | - |
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| Weight | 260 g | - |
| Colour | Matte black | Anthracite, matte black | - |
| Recommended Use | Professional audio, portable electronics | - |
| SOUND QUALITY | Sennheiser HD 660 S | - |
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| Headphones Form Factor | Full size | - |
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| Headphones Technology | Dynamic | - |
| Ear Cups Type | Open | - |
| Connectivity Technology | Wired | - |
| Sound Output Mode | Stereo | - |
| Frequency Response | 9 - 41500 Hz | - |
| Total Harmonic Distortion (THD) | 0.04% | - |
| Sensitivity | 104 dB/Vrms | - |
| Impedance | 150 Ohm | - |
| CABLE | Sennheiser HD 660 S | - |
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| Cable Type | Headphones cable - OFC - straight | - |
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| CONNECTIONS | Sennheiser HD 660 S | - |
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| Connector Type | Headphones (phone stereo 6.3 mm) | - |
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| OTHERS | Sennheiser HD 660 S | - |
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| Included Accessories | 3.5 mm to 6.3 mm adapter, 4.4 mm Pentaconn stereo jack plug | - |
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| Service & Support | Limited warranty - parts and labour - 2 years | - |
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