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Offered is „HD 660S2“ by Sennheiser as second-hand device from the category „Wire bound Headphone“ on audio-markt.de - the online market place for high-end. The advert with the number 5448031825 ends on 15.10.2026 at 06:09 o'clock.
At €495, this Sennheiser HD 660s2 asks for more than the obvious alternative of buying new, which often lands around €469–€599 depending on the seller. Compared to your own database anchor of a €277 median for used listings, this price is significantly ambitious, sitting well above the 75th percentile (€352) and nearly double the median. It is not a bargain; it is a premium asking price for a used unit.
The HD 660s2 remains a top-tier open-back choice for its superb bass extension and refined detail compared to the original HD 660s, delivering a modern, nuanced sound with lower distortion. However, at €495, you are paying near-new money for a used item, so the only upside would be if it includes original accessories, is in pristine original-owner condition, or offers a rare bundle that justifies the stretch. Without those extras, the fair play is to wait for listings closer to your €277 median.
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.
See all Sennheiser listings on RADAR.
