{"id":4562,"date":"2026-07-21T03:56:43","date_gmt":"2026-07-21T03:56:43","guid":{"rendered":"https:\/\/www.gradothailand.com\/?post_type=product&p=4562"},"modified":"2026-07-21T08:46:46","modified_gmt":"2026-07-21T08:46:46","slug":"opus-4","status":"publish","type":"product","link":"https:\/\/www.gradothailand.com\/en\/product\/opus-4\/","title":{"rendered":"Opus 4"},"content":{"rendered":"\t\t
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Opus4<\/h2>

Utilizing Grado\u2019s moving iron design, Opus4 provides a stable and consistent signal with low moving mass and long-term reliability.<\/p>

Offered in both stereo and mono configurations, Opus4 represents the foundation of the Grado wood cartridge line.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Performance<\/h2>

Opus4 is available in both high and low output configurations, allowing for compatibility across a wide range of phono stages.<\/p>

  • Its presentation is balanced and controlled, with clear detail and a smooth, natural top end.<\/li>
  • The midrange carries presence and warmth, while low frequencies remain defined and composed.<\/li>
  • Recordings are presented with stability and coherence, maintaining separation and musical flow while allowing the character of the recording to come through naturally.<\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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    Moving Iron Design<\/h2>

    All Grado cartridges utilize a moving iron design built on Joseph Grado\u2019s patented flux-bridger principle.<\/p>

    • This approach allows the cartridge to generate a precise signal with extremely low moving mass, while keeping the coil structure fixed.<\/li>
    • The result is a presentation that combines speed, control, and harmonic integrity without the fragility often associated with traditional moving coil systems.<\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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      Diamond & Cantilever<\/h2>

      Opus4 features a bonded elliptical diamond mounted to an aluminum cantilever.<\/p>

      • The elliptical profile provides effective groove contact and reliable tracking.<\/li>
      • The aluminum cantilever contributes to a stable and controlled presentation.<\/li>
      • This combination delivers clarity and balance across a wide range of recordings.<\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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        Coil & Internal Structure<\/h2>

        The internal signal path is built using ultra-high purity 5N OCC copper, selected for its conductivity and consistency.<\/p>

        • Each cartridge undergoes cryogenic treatment and internal damping to reduce unwanted resonance and preserve signal integrity.<\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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          Housing<\/h2>

          The Opus4 is housed in an American Maple wood body, selected for its ability to help control resonance and contribute to the cartridge\u2019s tonal balance. The structure supports stable playback and consistent performance across a wide range of tonearms.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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          Specs<\/h2>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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          • Body: American Maple Wood<\/li>\n
          • Cantilever: Aluminum\/Elliptical Diamond<\/li>\n\n
          • \n Output:\n
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            • High: 4.0mV @5 CMV (45)<\/li>\n
            • Low: 1.0mV @5 CMV (45)<\/li>\n <\/ul>\n <\/li>\n\n
            • \n Inductance:\n
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              • High Output: 55mH<\/li>\n
              • Low Output: 6mH<\/li>\n <\/ul>\n <\/li>\n\n
              • \n Resistance:\n
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                • High Output: 660 ohms<\/li>\n
                • Low Output: 70 ohms<\/li>\n <\/ul>\n <\/li>\n<\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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                  • Input Load: 10k-47k ohms<\/li>\n
                  • Cartridge Weight: 8.3 grams<\/li>\n
                  • Tracking Force: 1.6-1.9 grams<\/li>\n
                  • Compliance: 20\u03bcm\/mN<\/li>\n
                  • Channel Separation: Average 30db – 10-30k Hz<\/li>\n
                  • Controlled Frequency Response: 10-60 kHz<\/li>\n
                  • Non-Sensative to Capacitive Load<\/li>\n
                  • Builds: High Output, Low Output, Mono<\/li>\n<\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

                    Grado Opus4 \u2013 The Entry Point to the Timbre Series<\/strong>
                    \nOpus4 is the entry point into the Grado Timbre Series, introducing the tonal character and construction of Grado\u2019s 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.<\/p>\n","protected":false},"featured_media":3722,"template":"","meta":[],"product_brand":[],"product_cat":[56,58],"product_tag":[],"class_list":["post-4562","product","type-product","status-publish","has-post-thumbnail","product_cat-cartridges-en","product_cat-reference-series-timbre-en","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.gradothailand.com\/en\/wp-json\/wp\/v2\/product\/4562","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gradothailand.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.gradothailand.com\/en\/wp-json\/wp\/v2\/types\/product"}],"version-history":[{"count":4,"href":"https:\/\/www.gradothailand.com\/en\/wp-json\/wp\/v2\/product\/4562\/revisions"}],"predecessor-version":[{"id":4566,"href":"https:\/\/www.gradothailand.com\/en\/wp-json\/wp\/v2\/product\/4562\/revisions\/4566"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gradothailand.com\/en\/wp-json\/wp\/v2\/media\/3722"}],"wp:attachment":[{"href":"https:\/\/www.gradothailand.com\/en\/wp-json\/wp\/v2\/media?parent=4562"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.gradothailand.com\/en\/wp-json\/wp\/v2\/product_brand?post=4562"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.gradothailand.com\/en\/wp-json\/wp\/v2\/product_cat?post=4562"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.gradothailand.com\/en\/wp-json\/wp\/v2\/product_tag?post=4562"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}