{"product_id":"sennheiser-hd-820-bd","title":"Sennheiser HD 820","description":"\u003ccenter\u003e\n    \u003cdiv class=\"video-container\"\u003e\n        \u003ciframe width=\"100%\" height=\"100%\" style=\"max-width: 80vw; aspect-ratio: 16\/9;\" src=\"https:\/\/www.youtube.com\/embed\/FGxpXKdB0Fc?si=H6JXJqkIExKUHwKU\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; \n                gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen\u003e\n        \u003c\/iframe\u003e\n    \u003c\/div\u003e\n\u003c\/center\u003e\n\u003c!-- Bloco SEO antes da descrição --\u003e\n\u003cstyle\u003e\n  \/* Ficha e comparativos responsivos (Shopify-ready) *\/\n  .tabela-responsiva{\n    border-collapse:collapse;width:100%;max-width:960px;margin:16px auto;\n    font-family:Inter,system-ui,Segoe UI,Roboto,sans-serif;font-size:14px;color:#111;text-align:left\n  }\n  .tabela-responsiva th,.tabela-responsiva td{border:1px solid #e5e5e5;padding:10px 12px;vertical-align:top;background:#fff}\n  .tabela-responsiva thead th{background:#f7f7f7;font-weight:600}\n  .tabela-responsiva tbody tr:nth-child(even) td{background:#fafafa}\n  @media(max-width:768px){\n    .tabela-responsiva{border:0}\n    .tabela-responsiva thead{display:none}\n    .tabela-responsiva tbody{display:block}\n    .tabela-responsiva tr{display:block;border:1px solid #e5e5e5;border-radius:10px;margin-bottom:12px;overflow:hidden}\n    .tabela-responsiva td,.tabela-responsiva th[scope=\"row\"]{display:block;border:0;border-bottom:1px solid #f0f0f0;padding:12px 14px}\n    .tabela-responsiva td:last-child{border-bottom:0}\n    .tabela-responsiva td[data-label]::before{content:attr(data-label) \" \";display:block;font-weight:600;color:#333;margin-bottom:4px}\n  }\n  h2,h3{color:#222;margin:16px 0 8px}\n  ul,ol{padding-left:18px}\n\u003c\/style\u003e\n\u003ch2\u003eSennheiser HD 820 Closed-Back Over-Ear Headphones fones de ouvido fechados hi-fi\u003c\/h2\u003e\n\u003cp\u003eOs \u003cstrong\u003eSennheiser HD 820 Closed-Back Over-Ear Headphones\u003c\/strong\u003e foram projetados para audiófilos, engenheiros e criadores que precisam de \u003cstrong\u003esom de referência\u003c\/strong\u003e sem abrir mão de \u003cstrong\u003eisolamento\u003c\/strong\u003e e conforto prolongado. O design \u003cstrong\u003eclosed-back\u003c\/strong\u003e com tampas de \u003cstrong\u003evidro côncavo\u003c\/strong\u003e redireciona as ondas para um \u003cstrong\u003eabsorvedor interno\u003c\/strong\u003e, minimizando ressonâncias e preservando um palco sonoro amplo e natural — algo raro em fones fechados. Com \u003cstrong\u003etransdutores dinâmicos Ring Radiator\u003c\/strong\u003e, resposta de \u003cstrong\u003e12 Hz a 43,8 kHz\u003c\/strong\u003e, \u003cstrong\u003eimpedância de 300 Ω\u003c\/strong\u003e e \u003cstrong\u003eSPL máx. de 103 dB\u003c\/strong\u003e, os HD 820 revelam microdetalhes, texturas e camadas da gravação, entregando uma experiência \u003cstrong\u003ehi-fi\u003c\/strong\u003e fiel, seja para escuta crítica, masterização ou imersão musical em casa.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003ePrincipais destaques fones de ouvido fechados hi-fi\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign fechado com tampas de vidro côncavo\u003c\/strong\u003e que reduzem ressonâncias e garantem palco natural com até \u003cstrong\u003e26 dB\u003c\/strong\u003e de isolamento passivo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransdutores Ring Radiator\u003c\/strong\u003e para grave controlado, médios ricos e agudos extensos com precisão\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResposta de 12 Hz – 43,8 kHz\u003c\/strong\u003e e \u003cstrong\u003eimpedância de 300 Ω\u003c\/strong\u003e para performance máxima com amplificadores dedicados\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCabo de 3 m\u003c\/strong\u003e com baixa capacitância e conectores banhados a ouro \u003cstrong\u003e4,4 mm balanceado\u003c\/strong\u003e e \u003cstrong\u003e¼\" TRS\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConforto premium\u003c\/strong\u003e: almofadas artesanais em microfibra e arco metálico com amortecimento interno\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQualidade de construção Sennheiser\u003c\/strong\u003e e acessórios completos, incluindo caixa de armazenamento\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eVantagens do produto over-ear hi-fi Sennheiser\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSom de referência em formato fechado\u003c\/strong\u003e: aproveite a neutralidade e a transparência típicas de um open-back, mas com isolamento para ambientes ruidosos\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eErgonomia para longas sessões\u003c\/strong\u003e: materiais respiráveis, pressão de arco equilibrada e acabamento premium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConectividade versátil\u003c\/strong\u003e: use cabos \u003cstrong\u003ebalanceado 4,4 mm\u003c\/strong\u003e ou \u003cstrong\u003e¼\"\u003c\/strong\u003e com DAC\/amps dedicados para extrair todo o potencial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstrução durável\u003c\/strong\u003e: componentes selecionados (OFC prateado, conectores dourados) e headband metálico com amortecimento\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSet audiófilo escalável\u003c\/strong\u003e: base excelente para evoluir com melhores DACs, amps e cabos sob medida\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eEspecificações técnicas headphones closed-back\u003c\/h3\u003e\n\u003cdiv style=\"display: flex; justify-content: center;\"\u003e\n\u003cbr\u003e\n\u003ctable class=\"tabela-responsiva\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eEspecificação\u003c\/th\u003e\n\u003cth\u003eDetalhes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eMarca\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003eSennheiser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eModelo\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003eHD 820\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eTipo\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003eHeadphones Over-Ear Fechados (Closed-Back)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eTransdutor\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003eDinâmico Ring Radiator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eResposta de frequência\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003e12 Hz – 43,8 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eImpedância\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003e300 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eSPL máx.\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003e103 dB @ 1 kHz \/ 1 Vrms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eIsolamento passivo\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003eAté 26 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eDesign de casco\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003eClosed-Back com vidro côncavo e absorvedor interno\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eConectores\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003e1× 4,4 mm TRRRS balanceado, 1× ¼\" TRS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eCabo\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003e3 m, baixa capacitância (não destacável)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eControles\/Microfone\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003eSem controles; sem microfone embutido\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003ePeso\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003e360 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eCor\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003ePreto\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eField\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003eStereo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eDobrável\/Giro\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003eNão dobrável; sem giro de cápsula\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"\"\u003eConstrução\u003c\/td\u003e\n\u003ctd data-label=\"\"\u003eHeadband metálico com amortecimento; almofadas de microfibra artesanal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eCompatibilidades headphones hi-fi\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmplificadores de fone\/DACs dedicados\u003c\/strong\u003e com saídas \u003cstrong\u003e4,4 mm balanceado\u003c\/strong\u003e e \u003cstrong\u003e¼\" TRS\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlayers hi-res\u003c\/strong\u003e com saída balanceada 4,4 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterfaces de áudio profissionais\u003c\/strong\u003e com saída de fones ¼\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComputadores e streamers\u003c\/strong\u003e via DAC\/amp externo recomendado (300 Ω)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eConteúdo da embalagem fones de ouvido fechados\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSennheiser HD 820 Closed-Back Over-Ear Headphones\u003c\/li\u003e\n\u003cli\u003eCabo 3 m com conectores \u003cstrong\u003e4,4 mm balanceado\u003c\/strong\u003e e \u003cstrong\u003e¼\" TRS\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eUSB com manual e curva de resposta de frequência\u003c\/li\u003e\n\u003cli\u003ePano de microfibra\u003c\/li\u003e\n\u003cli\u003eCaixa de armazenamento\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eFAQ Sennheiser HD 820 closed-back hi-fi\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eO HD 820 precisa de amplificador dedicado\u003c\/strong\u003e\u003cbr\u003eSim. Com \u003cstrong\u003e300 Ω\u003c\/strong\u003e de impedância, rende muito melhor com DAC\/amp capaz de fornecer tensão adequada (saídas 4,4 mm\/¼\").\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eO isolamento é ativo ou passivo\u003c\/strong\u003e\u003cbr\u003ePassivo. O design fechado com tampas de vidro côncavo e vedação de microfibra oferece até \u003cstrong\u003e26 dB\u003c\/strong\u003e sem ANC.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQual a diferença para o HD 800 S open-back\u003c\/strong\u003e\u003cbr\u003eO \u003cstrong\u003eHD 800 S\u003c\/strong\u003e tem palco ainda mais amplo por ser aberto, porém sem isolamento. O \u003cstrong\u003eHD 820\u003c\/strong\u003e preserva grande parte da espacialidade com a vantagem do uso em ambientes ruidosos.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePosso usar direto no celular\u003c\/strong\u003e\u003cbr\u003eNão é recomendado. Use um \u003cstrong\u003eDAC\/amp portátil\u003c\/strong\u003e potente ou DAP com saída balanceada 4,4 mm para extrair o potencial.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOs cabos são substituíveis\u003c\/strong\u003e\u003cbr\u003eO conjunto acompanha o cabo de 3 m com terminações 4,4 mm\/¼\". Para upgrades, consulte cabos compatíveis balanceados\/oficiais Sennheiser.\u003c\/p\u003e","brand":"Astra Store","offers":[{"title":"Default Title","offer_id":52057812074799,"sku":"4490650252688","price":55953.78,"currency_code":"BRL","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0908\/4574\/1359\/files\/Sennheiser_HD_820_Closed-Back_Over-Ear_Headphones.jpg?v=1757958162","url":"https:\/\/br.octoshop.com\/products\/sennheiser-hd-820-bd","provider":"OctoShop","version":"1.0","type":"link"}