{"product_id":"sennheiser-hd-820-closed-back-over-ear-headphones","title":"Sennheiser HD 820 Closed-Back Over-Ear Headphones – Ring Radiator Drivers, Glass Transducer Covers","description":"\u003cdiv class=\"ab-product-description\" style=\"text-align: center; font-family: inherit;\"\u003e\n\u003cp\u003eEnjoy dedicated headphone listening with the privacy of a closed-back design. The Sennheiser HD 820 combines Ring Radiator transducers with distinctive concave glass covers, engineered to manage internal reflections and support a spacious presentation.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRing Radiator transducers\u003c\/strong\u003e – a dynamic design with a very wide frequency response, from 12Hz to 43.8kHz (-3dB).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConcave glass transducer covers\u003c\/strong\u003e – redirect sound from the rear of the driver into an absorber, reducing resonances in the sealed cup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClosed-back circumaural design\u003c\/strong\u003e – isolates you from your surroundings while keeping the sound open and transparent.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced cable\u003c\/strong\u003e – a 3 m impedance-matched, low-capacitance cable with silver-clad OFC conductors and a gold-plated 4.4 mm plug.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHandcrafted ear pads\u003c\/strong\u003e – combined with a damped metal headband for comfort and stability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGood to Know\u003c\/h3\u003e\n\u003cp\u003eWith a 300-ohm impedance, the HD 820 benefits from a capable dedicated headphone amplifier, ideally with a balanced output. It is manufactured in Germany.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: Dynamic, closed-back, circumaural\u003c\/li\u003e\n\u003cli\u003eTransducer: Ring Radiator with glass covers\u003c\/li\u003e\n\u003cli\u003eImpedance: 300 ohms\u003c\/li\u003e\n\u003cli\u003eFrequency response: 12Hz–43.8kHz (-3dB); 6Hz–48kHz (-10dB)\u003c\/li\u003e\n\u003cli\u003eSound pressure level: 103dB (1kHz, 1V)\u003c\/li\u003e\n\u003cli\u003eConnectors: 6.35 mm; 4.4 mm balanced\u003c\/li\u003e\n\u003cli\u003eCable: 3 m, silver-clad OFC, balanced\u003c\/li\u003e\n\u003cli\u003eWeight: 360 g (without cable)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"ab-product-shipping-returns\" style=\"text-align: center; font-family: inherit;\"\u003e\n\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eFree UK Delivery\u003c\/strong\u003e – We ship exclusively within the United Kingdom. Orders are processed within 1 business day, with estimated delivery in 5–8 business days after dispatch.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e30-Day Returns\u003c\/strong\u003e – Returns are accepted within 30 days of delivery, subject to our \u003ca href=\"\/policies\/refund-policy\"\u003eReturn \u0026amp; Refund Policy\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCustomer Support\u003c\/strong\u003e – Monday–Friday, 9 AM–5 PM (UK local time). Business days exclude weekends and UK bank holidays.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sennheiser","offers":[{"title":"Default Title","offer_id":67819639963898,"sku":"507435","price":1349.25,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0845\/5353\/1642\/files\/product_detail_x2_desktop_HD_820-Sennheiser-01.jpg?v=1792619774","url":"https:\/\/audiobass.co.uk\/products\/sennheiser-hd-820-closed-back-over-ear-headphones","provider":"Audio Bass","version":"1.0","type":"link"}