{"product_id":"sennheiser-hd-660s2","title":"Sennheiser HD 660S2","description":"\u003cdiv lang=\"en\"\u003e\n\u003cp\u003e\u003cstrong\u003eSennheiser HD 660S2\u003c\/strong\u003e – open-back dynamic over-ear headphones with 38 mm transducers, 300 Ω impedance, 104 dB SPL (1 kHz\/1 Vrms), 8–41,500 Hz frequency response, \u0026lt;0.04% THD (1 kHz\/100 dB), 260 g weight, detachable 1.8 m cables (6.3 mm single-ended and 4.4 mm balanced), 6.3–3.5 mm adapter, made in Ireland.\u003c\/p\u003e\n\u003cp\u003eHD 660S2 refines the HD 600-series reference tuning with deeper sub-bass extension and improved airflow around the driver for higher acoustic efficiency. An ultra-light aluminum voice coil with a 300-ohm load delivers fast transient response and low distortion, while the open-back chassis preserves a wide, natural soundstage.\u003c\/p\u003e\n\u003cp\u003eThe driver assembly uses steel-mesh damping shaped to the transducer geometry and a vented magnet system to control air movement and minimize distortion. Plush velour pads and a low-mass headband provide long-session comfort, and the dual detachable cables (single-ended and 4.4 mm balanced) simplify integration with studio and hi-fi headphone amps.\u003c\/p\u003e\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e300 Ω ultra-light aluminum voice coil for precise transients and amplifier synergy\u003c\/li\u003e\n\u003cli\u003e38 mm dynamic transducers with optimized surround and airflow for extended sub-bass\u003c\/li\u003e\n\u003cli\u003eOpen-back architecture for natural imaging and spacious soundstage\u003c\/li\u003e\n\u003cli\u003eVented magnet system and steel-mesh damping to reduce distortion\u003c\/li\u003e\n\u003cli\u003eTwo detachable 1.8 m cables (6.3 mm and 4.4 mm) plus 6.3→3.5 mm adapter\u003c\/li\u003e\n\u003cli\u003ePlush velour earpads; replaceable pads and cables for long-term serviceability\u003c\/li\u003e\n\u003cli\u003eManufactured in Ireland\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTransducer principle: Dynamic, open\u003c\/li\u003e\n\u003cli\u003eTransducer size: 38 mm\u003c\/li\u003e\n\u003cli\u003eImpedance: 300 Ω\u003c\/li\u003e\n\u003cli\u003eFrequency response: 8 – 41,500 Hz\u003c\/li\u003e\n\u003cli\u003eSound pressure level (SPL): 104 dB (1 kHz, 1 Vrms)\u003c\/li\u003e\n\u003cli\u003eTotal harmonic distortion (THD): \u0026lt;0.04% (1 kHz, 100 dB)\u003c\/li\u003e\n\u003cli\u003eEar coupling: Over-ear\u003c\/li\u003e\n\u003cli\u003eWeight (without cable): 260 g\u003c\/li\u003e\n\u003cli\u003eCable length: 1.8 m (both)\u003c\/li\u003e\n\u003cli\u003eConnectors: 6.3 mm (single-ended), 4.4 mm (balanced)\u003c\/li\u003e\n\u003cli\u003eIncluded: HD 660S2 headphones, 6.3 mm cable (1.8 m), 4.4 mm balanced cable (1.8 m), 6.3→3.5 mm adapter, pouch\u003c\/li\u003e\n\u003cli\u003eCountry of origin: Ireland\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Sennheiser","offers":[{"title":"Default Title","offer_id":58445612974412,"sku":"51770","price":548.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/9854\/1644\/files\/SennheiserHD660S21.jpg?v=1786985797","url":"https:\/\/noiseroom.lt\/products\/sennheiser-hd-660s2","provider":"Noise Room","version":"1.0","type":"link"}