{"product_id":"sennheiser-hd660s2-open-back-headphones-clearance-open-box","title":"Sennheiser HD660S2 Open Back Headphones - Clearance \/ Open Box","description":"\u003ch3\u003eSennheiser HD660S2 Open Back Headphones\u003c\/h3\u003e \u003cp\u003eElevate your musical journey with the HD 660S2 by Sennheiser, a refined successor to the HD 660S, boasting audiophile-grade specifications and an enhanced bass response. Immerse yourself in a captivating auditory adventure, courtesy of features like an optimized steel mesh surround, improved transducer airflow, and lighter yet higher-impedance aluminum voice coils. This results in impactful and extended sub-bass performance, allowing you to discern the deepest piano notes and bass drum beats without compromising comfort or the fidelity of natural sound reproduction.\u003c\/p\u003e \u003cp\u003eThese over-ear headphones, featuring an open-back design and ultrasoft velour earcups, guarantee exceptional comfort during extended listening sessions. The perfectly matched drivers ensure an intimate and high-fidelity listening experience with a minimal ±1 dB channel difference. The HD 660S2 includes two detachable cables in 1\/4\" unbalanced and 4.4mm balanced options, accompanied by a convenient 1\/4\" to 3.5mm adapter and a portable carry pouch.\u003c\/p\u003e \u003ch4\u003eEnhanced Impact and Emotional Resonance\u003c\/h4\u003e \u003cp\u003eExperience a transformative expansion of the entire sound spectrum, especially in the sub-bass frequencies. Sennheiser's meticulous engineering, doubling the sound pressure at the lowest frequencies, maintains extraordinary precision and balance across sub-bass, mid-bass, and beyond. The extension on the low-end creates a more spacious sonic landscape, elevating highs, deepening the soundstage, and intensifying emotional connections.\u003c\/p\u003e \u003ch4\u003eHeadphones that Match Comfort with Sound Quality\u003c\/h4\u003e \u003cp\u003eThe velour earpads of the HD 660S2 provide a tactile pleasure, offering the right tension for optimal acoustic positioning and supple padding for prolonged comfort. The open-back design ensures a comfortable listening environment even during lengthy sessions, and the lightweight construction and ergonomic headband eliminate any potential discomfort. Combined with exceptional Irish build quality, the listening experience is not only acoustically pleasing but also physically satisfying.\u003c\/p\u003e \u003ch4\u003eA Modern Take on a Legendary Line\u003c\/h4\u003e \u003cp\u003eContinuing the legacy of Sennheiser's high-end headphones, the HD 660S2 inherits the balanced and natural reproduction that inspired generations. Sharing visible and audible DNA with its predecessors, the HD 660S2 features a revised coil matching the 300-ohm impedance of the iconic HD 600 and HD 650. This new coil provides higher magnetic force and electrical dampening, resulting in cleaner impulse response. The compliant surround, with a resonant frequency of 70 Hz, contributes to greater precision, speed, and resolution, delivering double the sound pressure at the lowest frequencies.\u003c\/p\u003e \u003ch4\u003eKey Technical Advancements\u003c\/h4\u003e \u003cp\u003eOptimized transducer airflow reduces air leakage and enhances low-frequency acoustic pressure. Lightweight Duofol aluminum voice coils with a 300-ohm impedance improve electrical damping and detail retrieval. Twice the sound pressure at 20 Hz compared to previous models enhances the impact of percussion and electronic music. Stronger response above 5 kHz enhances perceived clarity, while a smoother response ensures more natural reproduction. A uniquely powerful vented magnet system minimizes distortion. 38mm high-performance dynamic drivers provide exceptional audio quality. Steel mesh baffle reduces permeability and augments bass response for a balanced and superior imaging experience.\u003c\/p\u003e \u003ch4\u003eHD660S Specs\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eEarpiece Design:\u003c\/strong\u003e Over-Ear (Circumaural), Open-Back\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEarpiece Swivel:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEarpiece Connection \/ Wearing Style:\u003c\/strong\u003e Headband, Wired\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFoldable:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDriver Type:\u003c\/strong\u003e Dynamic\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDriver Size:\u003c\/strong\u003e 1.5\" \/ 38 mm\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDiaphragm:\u003c\/strong\u003e Aluminum\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoice Coil:\u003c\/strong\u003e Copper-Clad Aluminum Wire\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eImpedance:\u003c\/strong\u003e 300 Ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eActive Noise Cancellation:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFull Remote OS Support:\u003c\/strong\u003e No\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003ePerformance:\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 8 Hz to 41.5 kHz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eResonant Frequency:\u003c\/strong\u003e 70 Hz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSensitivity:\u003c\/strong\u003e 104 dB SPL\/V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMatching Tolerance:\u003c\/strong\u003e 1 dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum Sound Pressure Level (SPL):\u003c\/strong\u003e 104 dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTotal Harmonic Distortion (THD):\u003c\/strong\u003e 0.04%\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eWired Connectivity:\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAudio Connector:\u003c\/strong\u003e 1 x 1\/4\" TRS Male, 1 x 4.4 mm TRRRS Male\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Adapter:\u003c\/strong\u003e 1\/8\" \/ 3.5 mm TRS\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCable Design:\u003c\/strong\u003e Y-Type, Straight, Detachable\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAudio Connector to Earpiece:\u003c\/strong\u003e 2 x 2-Pin Male\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCable Length:\u003c\/strong\u003e 5.9' \/ 1.8 m (Straight Cable)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCable Color:\u003c\/strong\u003e Black\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003ePhysical:\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eEnvironmental Protection:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eLED Indicator:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaterial of Construction:\u003c\/strong\u003e Aluminum, Plastic, Steel, Velour\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 9.2 oz \/ 260 g\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003ePackaging Info:\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePackage Weight:\u003c\/strong\u003e 1.405 lb\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBox Dimensions (LxWxH):\u003c\/strong\u003e 10.7 x 7.5 x 4.1\"\u003c\/li\u003e \u003c\/ul\u003e","brand":"Sennheiser","offers":[{"title":"Default Title","offer_id":45197247938719,"sku":"SEN-OBX-HD660S2-BLK","price":329.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0495\/6910\/4031\/files\/3964176a-afe9-4cf8-a6ef-7a5ff02af91f.jpg?v=1712070687","url":"https:\/\/listenup.com\/products\/sennheiser-hd660s2-open-back-headphones-clearance-open-box","provider":"ListenUp","version":"1.0","type":"link"}