{"product_id":"sennheiser-hd-660s2-offener-over-ear-kopfhoerer","title":"Sennheiser HD 660S2 Open-Back Over-Ear Headphone","description":"\u003cp\u003eThe Sennheiser HD 660S2 is an open-back, high-end over-ear headphone that delivers audiophile sound for a serious chain, thanks to 300-ohm drivers, extended sub-bass and a balanced connector. It takes the well-regarded HD 660S and pushes it audibly deeper into the bass without losing its precision.\u003c\/p\u003e\n\u003ch2\u003eWhy the HD 660S2?\u003c\/h2\u003e\n\u003cp\u003eInside works a newly vented magnet system with an ultra-light aluminium voice coil, built in Ireland. The result is outstanding impulse response with the finest resolution. The 300 ohms aren't a hurdle here, but an invitation to a good headphone amp - and via the balanced 4.4 mm connector you extract the last bit of quietness and control.\u003c\/p\u003e\n\u003ch2\u003eWhat you hear\u003c\/h2\u003e\n\u003cp\u003eA warm, engaging base tone, complemented by significantly extended sub-bass: Sennheiser has doubled the sound pressure of the lowest frequencies while still keeping the balance intact. Against this deeper backdrop, highs sound more brilliant, the stage deeper, and the music simply bigger.\u003c\/p\u003e\n\u003ch3\u003eWho is the HD 660S2 for?\u003c\/h3\u003e\n\u003cp\u003eFor audiophile listeners with a headphone amp or DAC\/amp who take vinyl, hi-res and the finest detail seriously. Straight talk: at 300 ohms, a phone stays pale and powerless - without a proper source you'd be buying the HD 660S2 below its worth. And because it's open-back, it's not for the office or the commute.\u003c\/p\u003e\n\u003ch2\u003eOur verdict\u003c\/h2\u003e\n\u003cp\u003eAn audiophile over-ear that combines the best of several worlds: precision, depth and long-session comfort. On the right chain, it plays well above its price. We at HD Zürisee in Wädenswil are happy to put together the right source for you.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat the trade press says:\u003c\/strong\u003e \"The HD 660S2 continues this tradition impressively.\" - hifitest.de, overall verdict \"reference class\" (5\/5 stars), 7\/2023.\u003c\/p\u003e\n\u003ch2\u003eTechnical data\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDesign: over-ear, open-back\u003c\/li\u003e\n\u003cli\u003eDriver principle: dynamic, open\u003c\/li\u003e\n\u003cli\u003eDriver size: 38 mm\u003c\/li\u003e\n\u003cli\u003eImpedance: 300 ohms\u003c\/li\u003e\n\u003cli\u003eFrequency response: 8 - 41,500 Hz\u003c\/li\u003e\n\u003cli\u003eSensitivity: 104 dB (1 kHz \/ 1 V RMS)\u003c\/li\u003e\n\u003cli\u003eTotal harmonic distortion (THD): \u0026lt; 0.04 % (1 kHz \/ 100 dB)\u003c\/li\u003e\n\u003cli\u003eConnector: 6.3 mm and 4.4 mm balanced; 6.3-to-3.5 mm adapter\u003c\/li\u003e\n\u003cli\u003eCable length: 1.8 m\u003c\/li\u003e\n\u003cli\u003eOrigin: Ireland\u003c\/li\u003e\n\u003cli\u003eWeight: 260 g\u003c\/li\u003e\n\u003cli\u003eIncluded: HD 660S2, 6.3 mm cable and 4.4 mm cable (1.8 m each), 6.3-to-3.5 mm adapter, carry case\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eDoes the Sennheiser HD 660S2 need a headphone amp?\u003c\/h3\u003e\n\u003cp\u003eYes, practically speaking. At 300 ohms, the HD 660S2 stays too quiet and powerless off a phone. It only unfolds its dynamics, control and depth with a headphone amp or DAC\/amp - we'll help you find the right source.\u003c\/p\u003e\n\u003ch3\u003eCan I run the HD 660S2 balanced?\u003c\/h3\u003e\n\u003cp\u003eYes. Besides the classic 6.3 mm cable, a balanced 4.4 mm cable is included. On a balanced output, the headphone audibly gains a quieter background and more control, especially in the bass.\u003c\/p\u003e\n\u003ch3\u003eHow does the HD 660S2 differ from the HD 660S?\u003c\/h3\u003e\n\u003cp\u003eThe HD 660S2 significantly extends the sub-bass: Sennheiser doubled the sound pressure of the lowest frequencies while preserving the usual precision. The sound image feels fuller and more spacious, without giving up the balanced character of the line.\u003c\/p\u003e\n\u003ch3\u003eWhy buy the Sennheiser HD 660S2 from HD Zürisee?\u003c\/h3\u003e\n\u003cp\u003eBecause a 300-ohm headphone without the right chain only shows half the truth - and we build the whole picture for you. We match headphone amp, DAC and cabling to the HD 660S2, with nearly three decades of experience on Lake Zurich. Call us on +41 44 680 22 00, message us on WhatsApp at \u003ca href=\"https:\/\/wa.me\/41765342200\"\u003e076 534 22 00\u003c\/a\u003e (text only, no calls) or email shop@hdzuerisee.ch.\u003c\/p\u003e\n\u003ch2\u003eGoes well with\u003c\/h2\u003e\n\u003cp\u003eGet a matching \u003ca href=\"\/en\/collections\/kopfhorerverstarker\"\u003eheadphone amp\u003c\/a\u003e, compare other \u003ca href=\"\/en\/collections\/kopfhorer\"\u003eheadphones\u003c\/a\u003e, or discover the other models from \u003ca href=\"\/en\/collections\/sennheiser\"\u003eSennheiser\u003c\/a\u003e.\u003c\/p\u003e","brand":"Sennheiser","offers":[{"title":"Default Title","offer_id":52989562028368,"sku":null,"price":569.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0932\/3262\/8048\/files\/sennheiser-hd-660s2-over-ear-kopfhoerer-schraegansicht.jpg?v=1786699535","url":"https:\/\/hdzuerisee.ch\/en\/products\/sennheiser-hd-660s2-offener-over-ear-kopfhoerer","provider":"HD Zürisee AG","version":"1.0","type":"link"}