{"product_id":"grado-opus4","title":"Grado Opus4","description":"\u003csection style=\"\n  position: relative;\n  width: 100%;\n  max-width: 1600px;\n  margin: 0 auto;\n  overflow: hidden;\n  background-color: #000;\n  display: flex;\n  align-items: center;\n  justify-content: center;\n\"\u003e\n\n  \u003c!-- Lớp hình ảnh --\u003e\n  \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0529\/7117\/6085\/files\/Cartridges-019.webp?v=1779012444\" alt=\"Grado Opus4\" style=\"\n      width: 100%;\n      height: auto;\n      display: block;\n      filter: brightness(80%) blur(1px);\n      transform: scale(1.05);\n    \"\u003e\n\n  \u003c!-- Lớp phủ gradient --\u003e\n  \u003cdiv style=\"\n    position: absolute;\n    top: 0;\n    left: 0;\n    width: 100%;\n    height: 100%;\n    background: linear-gradient(to right, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0.4) 50%, rgba(0,0,0,0) 100%);\n    z-index: 1;\n  \"\u003e\u003c\/div\u003e\n\n  \u003c!-- Lớp text --\u003e\n  \u003cdiv style=\"\n    position: absolute;\n    top: 50%;\n    left: 6%;\n    transform: translateY(-50%);\n    padding: 20px 30px;\n    text-align: center;\n    color: #ffffff;\n    max-width: 600px;\n    z-index: 2;\n  \"\u003e\n\n    \u003ch2 style=\"\n      font-size: 64px;\n      font-weight: 400;\n      font-family: 'Times New Roman', serif;\n      letter-spacing: 1px;\n      margin: 10px 0;\n      line-height: 1.1;\n      color: #ffffff;\n    \"\u003e\n      Opus4\n    \u003c\/h2\u003e\n  \u003c\/div\u003e\n\n\u003c\/section\u003e\n\n\u003c!-- SECTION 1 --\u003e\n\u003csection style=\"\n  display: flex;\n  justify-content: center;\n  align-items: stretch;\n  width: 100%;\n  max-width: 1600px;\n  margin: 0 auto;\n  overflow: hidden;\n  background-color: #000;\n  color: #fff;\n  font-family: 'Inter', sans-serif;\n\"\u003e\n\n  \u003cdiv style=\"\n    width: 50%;\n    background-color: #0d0d0d;\n    padding: 60px 40px;\n    display: flex;\n    flex-direction: column;\n    justify-content: center;\n    box-sizing: border-box;\n  \"\u003e\n    \u003ch2 style=\"\n      font-size: 30px;\n      font-weight: 500;\n      margin-bottom: 25px;\n      line-height: 1.2;\n      color: #ffffff;\n    \"\u003e\n      Description\n    \u003c\/h2\u003e\n    \u003cp style=\"\n      font-size: 16px;\n      line-height: 1.7;\n      color: #ffffff;\n      margin: 0;\n    \"\u003eOpus4 is the entry point into the Grado Timbre Series, introducing the tonal character and construction of Grado’s wood body cartridges. Built on decades of cartridge design experience, it delivers a balanced and musical presentation while maintaining the core performance principles that define Grado cartridges.\n\u003cbr\u003e\u003cbr\u003e\nUtilizing Grado’s moving iron design, Opus4 provides a stable and consistent signal with low moving mass and long-term reliability.\n\u003cbr\u003e\u003cbr\u003e\nOffered in both stereo and mono configurations, Opus4 represents the foundation of the Grado wood cartridge line.\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"\n    width: 50%;\n    position: relative;\n    overflow: hidden;\n    display: flex;\n  \"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0529\/7117\/6085\/files\/Timbre-Opus.webp?v=1779012442\" alt=\"Grado Opus4\" style=\"\n        width: 100%;\n        height: 100%;\n        object-fit: cover;\n        display: block;\n      \"\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003c!-- SECTION 2 --\u003e\n\u003csection style=\"\n  display: flex;\n  justify-content: center;\n  align-items: stretch;\n  width: 100%;\n  max-width: 1600px;\n  margin: 0 auto;\n  overflow: hidden;\n  background-color: #000;\n  color: #fff;\n  font-family: 'Inter', sans-serif;\n  border-top: none;\n\"\u003e\n\n  \u003c!-- Cột bên trái: Hình ảnh --\u003e\n  \u003cdiv style=\"\n    width: 50%;\n    position: relative;\n    overflow: hidden;\n    display: flex;\n  \"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0529\/7117\/6085\/files\/e3c6ebb5d460--Cartridges-017.webp?v=1779012443\" alt=\"Grado Opus4\" style=\"\n        width: 100%;\n        height: 100%;\n        object-fit: cover;\n        display: block;\n      \"\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Cột bên phải: Thông số kỹ thuật --\u003e\n  \u003cdiv style=\"\n    width: 50%;\n    background-color: #0d0d0d;\n    padding: 60px 40px;\n    display: flex;\n    flex-direction: column;\n    justify-content: center;\n    box-sizing: border-box;\n  \"\u003e\n    \u003ch2 style=\"\n      font-size: 30px;\n      font-weight: 500;\n      margin-bottom: 25px;\n      line-height: 1.2;\n      color: #ffffff;\n    \"\u003e\n      Specifications\n    \u003c\/h2\u003e\n    \u003cul style=\"\n      font-size: 16px;\n      line-height: 1.7;\n      color: #ffffff;\n      margin: 0;\n      padding-left: 20px;\n      list-style-type: disc;\n    \"\u003e\n      \u003cli\u003eBody: American Maple Wood\u003c\/li\u003e\n      \u003cli\u003eCantilever: Aluminum\/Elliptical Diamond\u003c\/li\u003e\n      \u003cli\u003eOutput:\u003cbr\u003e\nHigh 4.0mV @5 CMV (45)\u003cbr\u003e\nLow 1.0mV @5 CMV (45)\u003c\/li\u003e\n      \u003cli\u003eInductance:\u003cbr\u003e\nHigh Output 55mH\u003cbr\u003e\nLow Output 6mH\u003c\/li\u003e\n      \u003cli\u003eResistance:\u003cbr\u003e\nHigh Output 660 ohms\u003cbr\u003e\nLow Output 70 ohms\u003c\/li\u003e\n      \u003cli\u003eInput Load: 10k-47k ohms\u003c\/li\u003e\n      \u003cli\u003eCartridge Weight: 8.3 grams\u003c\/li\u003e\n      \u003cli\u003eTracking Force: 1.6-1.9 grams\u003c\/li\u003e\n      \u003cli\u003eCompliance: 20µm\/mN\u003c\/li\u003e\n      \u003cli\u003eChannel Seperation: Average 30db-10-30k Hz\u003c\/li\u003e\n      \u003cli\u003eControlled Frequency Response: 10-60 kHz\u003c\/li\u003e\n      \u003cli\u003eNon-Sensative to Capacitive Load\u003c\/li\u003e\n      \u003cli\u003eBuilds: High Output, Low Output, Mono\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection style=\"\n  display: flex;\n  justify-content: center;\n  align-items: stretch;\n  width: 100%;\n  max-width: 1600px;\n  margin: 0 auto;\n  overflow: hidden;\n  background-color: #000;\n  color: #fff;\n  font-family: 'Inter', sans-serif;\n  border-top: none;\n\"\u003e\n  \u003cdiv style=\"\n    width: 50%;\n    background-color: #0d0d0d;\n    padding: 60px 40px;\n    display: flex;\n    flex-direction: column;\n    justify-content: center;\n    box-sizing: border-box;\n  \"\u003e\n    \u003ch2 style=\"\n      font-size: 30px;\n      font-weight: 500;\n      margin-bottom: 25px;\n      line-height: 1.2;\n      color: #ffffff;\n    \"\u003e\n      Performance\n    \u003c\/h2\u003e\n    \u003cp style=\"\n      font-size: 16px;\n      line-height: 1.7;\n      color: #ffffff;\n      margin: 0;\n    \"\u003eOpus4 is available in both high and low output configurations, allowing for compatibility across a wide range of phono stages.\n\u003cbr\u003e\u003cbr\u003e\nIts presentation is balanced and controlled, with clear detail and a smooth, natural top end. The midrange carries presence and warmth, while low frequencies remain defined and composed.\n\u003cbr\u003e\u003cbr\u003e\nRecordings are presented with stability and coherence, maintaining separation and musical flow while allowing the character of the recording to come through naturally.\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"\n    width: 50%;\n    position: relative;\n    overflow: hidden;\n    display: flex;\n  \"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0529\/7117\/6085\/files\/Cartridges-020.webp?v=1779012443\" alt=\"Grado Opus4\" style=\"\n        width: 100%;\n        height: 100%;\n        object-fit: cover;\n        display: block;\n      \"\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n  \u003csection style=\"\n  display: flex;\n  justify-content: center;\n  align-items: stretch;\n  width: 100%;\n  max-width: 1600px;\n  margin: 0 auto;\n  overflow: hidden;\n  color: #fff;\n  font-family: 'Inter', sans-serif;\n  border-top: none;\n\"\u003e\n\n\u003cdiv style=\"\n    width: 50%;\n    position: relative;\n    overflow: hidden;\n    display: flex;\n  \"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0529\/7117\/6085\/files\/Cartridges-018.webp?v=1779012444\" alt=\"Grado Opus4\" style=\"\n        width: 100%;\n        height: 100%;\n        object-fit: cover;\n        display: block;\n      \"\u003e\n  \u003c\/div\u003e\n    \n  \u003cdiv style=\"\n    width: 50%;\n    padding: 60px 40px;\n    display: flex;\n    flex-direction: column;\n    justify-content: center;\n    box-sizing: border-box;\n    text-align: right;\n  \"\u003e\n    \u003ch2 style=\"\n      font-size: 30px;\n      font-weight: 500;\n      margin-bottom: 25px;\n      line-height: 1.2;\n      color: #000000;\n      \n    \"\u003e\n      Moving Iron Design\n    \u003c\/h2\u003e\n    \u003cp style=\"\n      font-size: 16px;\n      line-height: 1.7;\n      color: #000000;\n      margin: 0;\n    \"\u003eAll Grado cartridges utilize a moving iron design built on Joseph Grado’s pa\u003cbr\u003e\u003cbr\u003e\nThis approach allows the cartridge to generate a precise signal with extremely low moving mass, while keeping the coil structure fixed. The result is a presentation that combines speed, control, and harmonic integrity without the fragility often associated with traditional moving coil systems.\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/section\u003e\n\n  \u003csection style=\"\n  display: flex;\n  justify-content: center;\n  align-items: stretch;\n  width: 100%;\n  max-width: 1600px;\n  margin: 0 auto;\n  overflow: hidden;\n  background-color: #000;\n  color: #fff;\n  font-family: 'Inter', sans-serif;\n  border-top: none;\n\"\u003e\n  \u003cdiv style=\"\n    width: 50%;\n    background-color: #0d0d0d;\n    padding: 60px 40px;\n    display: flex;\n    flex-direction: column;\n    justify-content: center;\n    box-sizing: border-box;\n  \"\u003e\n    \u003ch2 style=\"\n      font-size: 30px;\n      font-weight: 500;\n      margin-bottom: 25px;\n      line-height: 1.2;\n      color: #ffffff;\n    \"\u003e\n      Diamond \u0026amp; Cantilever\n    \u003c\/h2\u003e\n    \u003cp style=\"\n      font-size: 16px;\n      line-height: 1.7;\n      color: #ffffff;\n      margin: 0;\n      margin-bottom: 25px;\n    \"\u003eOpus4 features a bonded elliptical diamond mounted to an aluminum cantilever.\n\u003cbr\u003e\u003cbr\u003e\nThe elliptical profile provides effective groove contact and reliable tracking, while the aluminum cantilever contributes to a stable and controlled presentation. This combination delivers clarity and balance across a wide range of recordings.\n    \u003c\/p\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"\n    width: 50%;\n    position: relative;\n    overflow: hidden;\n    display: flex;\n  \"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0529\/7117\/6085\/files\/e3c6ebb5d460--Cartridges-017.webp?v=1779012443\" alt=\"Grado Opus4\" style=\"\n        width: 100%;\n        height: 100%;\n        object-fit: cover;\n        display: block;\n      \"\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n  \u003csection style=\"\n  display: flex;\n  justify-content: center;\n  align-items: stretch;\n  width: 100%;\n  max-width: 1600px;\n  margin: 0 auto;\n  overflow: hidden;\n  background-color: #000;\n  color: #fff;\n  font-family: 'Inter', sans-serif;\n  border-top: none;\n\"\u003e\n\n\u003cdiv style=\"\n    width: 50%;\n    position: relative;\n    overflow: hidden;\n    display: flex;\n  \"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0529\/7117\/6085\/files\/Cartridges-019.webp?v=1779012444\" alt=\"Grado Opus4\" style=\"\n        width: 100%;\n        height: 100%;\n        object-fit: cover;\n        display: block;\n      \"\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv style=\"\n    width: 50%;\n    background-color: #ffffff;\n    padding: 60px 40px;\n    display: flex;\n    flex-direction: column;\n    justify-content: center;\n    box-sizing: border-box;\n    text-align: right;\n  \"\u003e\n    \u003ch2 style=\"\n      font-size: 30px;\n      font-weight: 500;\n      margin-bottom: 25px;\n      line-height: 1.2;\n      color: #000000;\n    \"\u003e\n      Coil \u0026amp; Internal Structure\n    \u003c\/h2\u003e\n    \u003cp style=\"\n      font-size: 16px;\n      line-height: 1.7;\n      color: #000000;\n      margin: 0;\n    \"\u003eThe internal signal path is built using ultra-high purity 5N OCC copper, selected for its conductivity and consistency.\n\u003cbr\u003e\u003cbr\u003e\nEach cartridge undergoes cryogenic treatment and internal damping to reduce unwanted resonance and preserve signal integrity.\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/section\u003e\n\n\u003csection style=\"\n  display: flex;\n  justify-content: center;\n  align-items: stretch;\n  width: 100%;\n  max-width: 1600px;\n  margin: 0 auto;\n  overflow: hidden;\n  background-color: #000;\n  color: #fff;\n  font-family: 'Inter', sans-serif;\n  border-top: none;\n\"\u003e\n  \u003cdiv style=\"\n    width: 50%;\n    background-color: #0d0d0d;\n    padding: 60px 40px;\n    display: flex;\n    flex-direction: column;\n    justify-content: center;\n    box-sizing: border-box;\n  \"\u003e\n    \u003ch2 style=\"\n      font-size: 30px;\n      font-weight: 500;\n      margin-bottom: 25px;\n      line-height: 1.2;\n      color: #ffffff;\n    \"\u003e\n      Housing\n    \u003c\/h2\u003e\n    \u003cp style=\"\n      font-size: 16px;\n      line-height: 1.7;\n      color: #ffffff;\n      margin: 0;\n      margin-bottom: 25px;\n    \"\u003eThe Opus4 is housed in an American Maple wood body, selected for its ability to help control resonance and contribute to the cartridge’s tonal balance. The structure supports stable playback and consistent performance across a wide range of tonearms.\n    \u003c\/p\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"\n    width: 50%;\n    position: relative;\n    overflow: hidden;\n    display: flex;\n  \"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0529\/7117\/6085\/files\/Timbre-Opus.webp?v=1779012442\" alt=\"Grado Opus4\" style=\"\n        width: 100%;\n        height: 100%;\n        object-fit: cover;\n        display: block;\n      \"\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n  \n\n\u003csection style=\"\n  position: relative;\n  width: 100%;\n  max-width: 1600px;\n  margin: 0 auto;\n  overflow: hidden;\n  font-family: 'Inter', sans-serif;\n  text-align: center;\n  color: #000;\n\"\u003e\n\n  \u003c!-- Hình nền --\u003e\n  \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0529\/7117\/6085\/files\/Cartridges-019.webp?v=1779012444\" alt=\"Grado Opus4\" style=\"\n      width: 100%;\n      height: auto;\n      display: block;\n      filter: brightness(80%) blur(2px);\n      transform: scale(1.05);\n    \"\u003e\n\n  \u003c!-- Lớp phủ mờ --\u003e\n  \u003cdiv style=\"\n    position: absolute;\n    top: 0;\n    left: 0;\n    width: 100%;\n    height: 100%;\n    background: rgba(255,255,255,0.2);\n    z-index: 1;\n  \"\u003e\u003c\/div\u003e\n\n  \u003c!-- Hộp nội dung --\u003e\n  \u003cdiv style=\"\n    position: absolute;\n    top: 50%;\n    left: 50%;\n    transform: translate(-50%, -50%);\n    width: 80%;\n    background: rgba(255, 255, 255, 0.85);\n    padding: 60px 80px;\n    border-radius: 0; \/* Không bo góc *\/\n    z-index: 2;\n    box-shadow: 0 4px 20px rgba(0,0,0,0.2);\n  \"\u003e\n    \u003ch2 style=\"\n      font-size: 38px;\n      font-weight: 500;\n      margin-bottom: 20px;\n    \"\u003e\n      Wood Cartridge Upgrade Program\n    \u003c\/h2\u003e\n    \u003cp style=\"\n      font-size: 18px;\n      line-height: 1.6;\n      margin: 0 auto;\n      max-width: 90%;\n      color: #111;\n    \"\u003e\n     Grado wood body cartridges are supported through our Wood Cartridge Upgrade Program.\n\u003cbr\u003e\u003cbr\u003e\nThis program allows you to move from your current Grado wood cartridge to another model, with a pricing accommodation provided through the program. The program applies exclusively to Grado wood body cartridges, and pricing is based on the model being purchased.\n\u003cbr\u003e\u003cbr\u003e\nFor details and current pricing, please contact us and state the model you are interested in purchasing.\n\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n ","brand":"Grado Labs","offers":[{"title":"Cartridge","offer_id":47358946050197,"sku":null,"price":425.0,"currency_code":"CAD","in_stock":true},{"title":"with Replacement Stylus","offer_id":47358946082965,"sku":null,"price":708.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0529\/7117\/6085\/files\/Timbre-Opus_644aa5e7-b1c3-42c1-9e6e-43a77f1cea31.webp?v=1779018282","url":"https:\/\/houseofstereo.com\/es-ca\/products\/grado-opus4","provider":"House Of Stereo","version":"1.0","type":"link"}