SENNHEISER HD 660S Open-Back Headphones

【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 dispersion unique to open-back designs
•✅ Smooth mid-highs and tight bass, versatile sound suitable for any genre
•✅ Precisely selected high-precision drivers ensure channel balance within ±1dB
•✅ 150Ω impedance, making 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
No outer box
•✅ 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)
•✅ Minor scuffs on the main unit.
These do not affect usability, but please check the photos for the exact condition.

・Please understand that as this is a used item, there may be minor signs of use.


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■Shipping
•Free shipping, ships within 24 hours of purchase
•Carefully packaged to protect against scratches and impact

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The HD 660S was released as an evolution of Sennheiser's masterpiece, the 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 comment if you have any questions!