SENNHEISER HD 660S Open-Back Headphones (Used)

【Free Shipping】SENNHEISER HD 660S Open-Back Headphones (Used)

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These are the Sennheiser HD 660S open-back headphones.
Highly regarded among audio enthusiasts, they are known for their musical and natural sound that is easy on the ears even during long listening sessions.

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■Product Overview
• Brand: Sennheiser
• Model: HD 660S
• Color: Black
• Type: Open-back / Dynamic
• Wearing Style: Over-ear
• Impedance: 150Ω
• Connection: Wired (6.3mm stereo plug, 4.4mm balanced Pentaconn plug)

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■Product Features
• ✅ Wide soundstage and natural sound diffusion unique to open-back designs
• ✅ Versatile sound with clear mid-highs and tight bass, suitable for any genre
• ✅ Precisely selected high-accuracy drivers ensure channel balance within ±1dB
• ✅ 150Ω impedance makes them easy to use in portable setups
• ✅ Comes with two high-quality cables:
　・6.3mm standard stereo plug (for amplifiers, etc.)
　・4.4mm Pentaconn balanced plug (for portable amplifiers, etc.)

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■Condition
Outer box included
• ✅ Operation confirmed (sound output is normal for both left and right channels)
• ✅ Disinfected and cleaned with 99.5% alcohol
• ✅ Stored in a non-smoking, pet-free environment (managed in a case with desiccant)
• ✅ There are minor scuffs on the main unit.
These do not affect usability, but please check the photos for the exact condition.

• Please understand that as a used item, there may be minor signs of wear consistent with use.

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■Shipping
• Free shipping. Ships within 24 hours of purchase.
• Will be carefully packaged to protect against scratches and impact.

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The HD 660S was released as an evolution of Sennheiser's acclaimed HD650, and is a high-quality model praised by many music fans. Enjoy a high-level audio experience for everything from home music listening to music production.

Please feel free to ask any questions in the comments!