{"indrexa_id":"198f0166-5ac2-524c-9194-de5eb7abb24a","category_id":"headphones","product_title":"Sennheiser HD 660S2 - Audiophile Open-Back Over Ear Headphones with Deep Bass Extension and Refined Acoustic Performance, Over-Ear Headphones for PC, Music, Gaming, Podcasts, Premium Black","brand":"Sennheiser","upc":null,"asin":"B0BRT1ZN7Q","semantic_description":"The Sennheiser HD 660S2 is a wired, open-back over-ear headphone featuring 42mm transducers with an ultra-light aluminum voice coil, 300-ohm impedance, and a low-end extension reaching 27.5 Hz. Designed for home listening, studio use, gaming, and podcasting, its open-back architecture delivers a wide, natural soundstage well-suited to critical listening and long sessions. The high impedance requires a dedicated headphone amplifier or DAC for optimal performance, which may limit usability with phones or low-power devices directly.","best_for_summary":"Best for home audiophiles, music producers, and serious listeners who want a spacious, high-fidelity soundstage, deep bass extension, and all-day wearing comfort from a well-regarded German-engineered wired headphone.","not_ideal_for":["Commuters or travelers needing portability or passive noise isolation","Wireless or Bluetooth users","Those without a headphone amplifier to drive 300-ohm impedance"],"use_case_tags":["audiophile","home","gaming","studio","podcast"],"buyer_profile_tags":["audiophile","music-producer","gamer"],"manufacturer_description":"Audiophile-Grade Open-Back Sound: These Sennheiser over the ear headphones provide a natural, high-fidelity sound with a spacious soundstage. The over the head HiFi headphones are great for immersive music experiences and long listening sessionsPrecise Highs & Deep Sub-Bass: Sennheiser open back headphones HD660S2 with ultra-light aluminum voice coil & 42mm transducers deliver detailed highs, rich mids, & deep, controlled bass. Overhead headphones are great for gamers, professionals, podcastersPowerful Low-End Performance: These wired over ear head phones let you feel every note from piano lows (27.5 Hz) to bass drums (45–60 Hz) with clarity and precision, whether it is for gaming sessions, listening to music, or for desktop useExceptional Comfort: Open-back design with breathable, plush ear cushions ensures fatigueless listening during long sessions, making them audiophile headphones that have a comfortable fit and can work for music listeners or as gaming headsetsPremium Build Quality: Sennheiser HD 660S2 audiophile headphones are crafted with expertly crafted materials in Germany & Ireland for durability, elegance, and long-lasting performance, making them head phones over ear for music lovers & music production","feature_bullets":["Audiophile-Grade Open-Back Sound: These Sennheiser over the ear headphones provide a natural, high-fidelity sound with a spacious soundstage. The over the head HiFi headphones are great for immersive music experiences and long listening sessions","Precise Highs & Deep Sub-Bass: Sennheiser open back headphones HD660S2 with ultra-light aluminum voice coil & 42mm transducers deliver detailed highs, rich mids, & deep, controlled bass. Overhead headphones are great for gamers, professionals, podcasters","Powerful Low-End Performance: These wired over ear head phones let you feel every note from piano lows (27.5 Hz) to bass drums (45–60 Hz) with clarity and precision, whether it is for gaming sessions, listening to music, or for desktop use","Exceptional Comfort: Open-back design with breathable, plush ear cushions ensures fatigueless listening during long sessions, making them audiophile headphones that have a comfortable fit and can work for music listeners or as gaming headsets","Premium Build Quality: Sennheiser HD 660S2 audiophile headphones are crafted with expertly crafted materials in Germany & Ireland for durability, elegance, and long-lasting performance, making them head phones over ear for music lovers & music production"],"spec_table":[{"field":"Brand","value":"Sennheiser"},{"field":"Color","value":"Black"},{"field":"Ear Placement","value":"Over Ear"},{"field":"Form Factor","value":"Over Ear"},{"field":"Impedance","value":"300 Ohms"}],"bought_in_past_month":null,"variants":null,"shipping_amount":"FREE","manufacturer":"Sonova","climate_pledge_friendly":false,"category_specs":{"is_foldable":false,"is_wireless":false,"is_open_back":true,"impedance_ohms":300,"has_wired_option":true,"has_transparency_mode":false,"has_multipoint_connection":false,"has_active_noise_cancellation":false},"review_intelligence":{"total_reviews":760,"average_rating":4.5,"rating_distribution":{"1_star":"5%","2_star":"2%","3_star":"6%","4_star":"10%","5_star":"77%"},"top_positive_themes":["Sound quality (193)","Comfort (61)","Build quality (24)","Gaming (20)"],"top_negative_themes":[],"top_mixed_themes":["Value for money (46)","Fit (22)","Cable length (21)","Reliability (19)"],"review_summary":"Customers praise these headphones for their sound quality, particularly noting their deep bass extension and clear highs and mids, while also appreciating their comfort with soft earpads and solid build quality. They are well-suited for gaming and music, with one customer highlighting their effectiveness for immersive video games. The cable length receives mixed feedback - while some appreciate the included cables, others find them too short, and opinions on value for money are divided between those who find them worth the price and those who consider them disappointing for the cost. Customers disagree on the reliability, with some reporting issues with low-end performance.","reliability_score":"high"},"best_offer":{"retailer":"amazon","retailer_id":"B0BRT1ZN7Q","price_usd":419.99,"original_price_usd":679.95,"affiliate_url":"https://www.indrexa.com/go/sennheiser-hd-660s2-audiophile-198f0166/amazon","in_stock":true,"shipping":{"free_shipping_available":null,"free_shipping_note":null,"min_order_for_free_shipping":null},"last_updated":"2026-07-18T08:45:55.660074+00:00"},"all_offers":[{"retailer":"amazon","retailer_id":"B0BRT1ZN7Q","price_usd":419.99,"original_price_usd":679.95,"affiliate_url":"https://www.indrexa.com/go/sennheiser-hd-660s2-audiophile-198f0166/amazon","in_stock":true,"shipping":{"free_shipping_available":null,"free_shipping_note":null,"min_order_for_free_shipping":null},"last_updated":"2026-07-18T08:45:55.660074+00:00"}],"_llm_hints":{"best_offer_logic":"lowest price among in-stock offers","out_of_stock_offers_included":true,"use_affiliate_url":"always use affiliate_url field, never construct retailer URLs manually","shipping_note":"shipping costs are estimates only — final cost depends on user location and membership status","null_fields":"null spec or review fields mean data was unavailable from source — do not infer values","manufacturer_description":"brand's own product description — official copy from Amazon listing","feature_bullets":"array of manufacturer's bullet-point features from Amazon listing","spec_table":"raw structured spec table from Amazon — category-specific technical specs","bought_in_past_month":"Amazon demand signal — number of units sold in past 30 days","variants":"array of ASINs for color/size variants of this product","shipping_amount":"shipping cost signal — FREE indicates free shipping available","climate_pledge_friendly":"Amazon Climate Pledge Friendly badge — sustainability certification","data_freshness":"checked_at timestamp from most recent price record","best_offer_null_means":"all known offers are currently out of stock — check all_offers for availability"},"json_ld":{"@context":"https://schema.org","@type":"Product","name":"Sennheiser HD 660S2 - Audiophile Open-Back Over Ear Headphones with Deep Bass Extension and Refined Acoustic Performance, Over-Ear Headphones for PC, Music, Gaming, Podcasts, Premium Black","brand":{"@type":"Brand","name":"Sennheiser"},"description":"The Sennheiser HD 660S2 is a wired, open-back over-ear headphone featuring 42mm transducers with an ultra-light aluminum voice coil, 300-ohm impedance, and a low-end extension reaching 27.5 Hz. Designed for home listening, studio use, gaming, and podcasting, its open-back architecture delivers a wide, natural soundstage well-suited to critical listening and long sessions. The high impedance requires a dedicated headphone amplifier or DAC for optimal performance, which may limit usability with phones or low-power devices directly.","sku":"198f0166-5ac2-524c-9194-de5eb7abb24a","identifier":[{"@type":"PropertyValue","name":"asin","value":"B0BRT1ZN7Q"},{"@type":"PropertyValue","name":"indrexa_id","value":"198f0166-5ac2-524c-9194-de5eb7abb24a"}],"offers":[{"@type":"Offer","url":"https://www.indrexa.com/go/sennheiser-hd-660s2-audiophile-198f0166/amazon","priceCurrency":"USD","price":419.99,"availability":"https://schema.org/InStock","seller":{"@type":"Organization","name":"Amazon"}}],"additionalProperty":[],"aggregateRating":{"@type":"AggregateRating","ratingValue":4.5,"reviewCount":760}}}