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Like new box everything included
Is this the kind of clean, no-drama buy you want to pounce on? At €270, it lands essentially on the €271 median of recent EUR comps and right between the €264 and €280 quartiles, so this is a fair market ask rather than a steal or an ask that needs haggling.
The HD 660S2 is well liked for its easygoing, refined tuning, strong midrange clarity, and more satisfying low-end weight than the older Sennheiser classics, which makes it a very sensible daily-driver open-back if you want comfort and a smooth, non-fatiguing presentation. If the cables and accessories are all there and the condition checks out, this reads as a solid buy rather than a risky one; the main upside is simply getting a highly regarded headphone at proper used-market money.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Founded in June 1945 by Dr. Fritz Sennheiser in a farmhouse near Hanover, Germany, Sennheiser began as Laboratorium Wennebostel, producing voltmeters and early microphones amid post-World War II reconstruction. Seven engineers from the University of Hannover joined the founder, quickly pivoting to broadcast microphones like the DM 2 in 1946 and the groundbreaking MD 82 shotgun mic in 1956. Renamed Sennheiser electronic in 1958, the family-owned company passed to second- and third-generation leadership, maintaining its innovative spirit over eight decades.
Sennheiser excels in professional and consumer audio, renowned for microphones, wireless systems, and headphones that set industry standards. Pioneers of the first open-back headphones (HD 414 in 1968) and enduring studio icons like the MD 421 and MD 441, they also produce high-end headphones, earbuds, soundbars, and conferencing solutions. While strong in pro audio like mixers and geophysical gear, their consumer focus centers on headphones and wireless tech rather than amplifiers, speakers, turntables, DACs, or cables.
Sennheiser commands a premium position in the hi-fi market, blending mid-tier accessibility with high-end excellence for discerning buyers and professionals. Trusted for reliability and sonic precision, it appeals to audiophiles seeking reference-grade headphones without boutique obscurity, backed by a heritage of technological firsts that sustains its global leadership.
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