{"product_id":"grado-labs-opus4-mi-phono-cartridge","title":"Grado Labs Opus4 MI Phono Cartridge","description":"\u003cp\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.\u003c\/p\u003e\n\u003cp\u003eUtilizing Grado’s moving iron design, Opus4 provides a stable and consistent signal with low moving mass and long-term reliability.\u003c\/p\u003e\n\u003cp\u003eOffered in both stereo and mono configurations, Opus4 represents the foundation of the Grado wood cartridge line.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003ePerformance\u003c\/p\u003e\n\u003cp\u003eOpus4 is available in both high and low output configurations, allowing for compatibility across a wide range of phono stages.\u003c\/p\u003e\n\u003cp\u003eIts 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.\u003c\/p\u003e\n\u003cp\u003eRecordings are presented with stability and coherence, maintaining separation and musical flow while allowing the character of the recording to come through naturally.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eMoving Iron Design\u003c\/p\u003e\n\u003cp\u003eAll Grado cartridges utilize a moving iron design built on Joseph Grado’s patented flux-bridger principle.\u003c\/p\u003e\n\u003cp\u003eThis 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.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eDiamond \u0026amp; Cantilever\u003c\/p\u003e\n\u003cp\u003eOpus4 features a bonded elliptical diamond mounted to an aluminum cantilever.\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eCoil \u0026amp; Internal Structure\u003c\/p\u003e\n\u003cp\u003eThe internal signal path is built using ultra-high purity 5N OCC copper, selected for its conductivity and consistency.\u003c\/p\u003e\n\u003cp\u003eEach cartridge undergoes cryogenic treatment and internal damping to reduce unwanted resonance and preserve signal integrity.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eHousing\u003c\/p\u003e\n\u003cp\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.\u003c\/p\u003e\n\u003cp\u003eSpecs:\u003c\/p\u003e\n\u003cp\u003eBody: American Maple Wood\u003cbr\u003eCantilever: Aluminum\/Elliptical Diamond\u003cbr\u003eOutput:\u003cbr\u003eHigh 4.0mV @5 CMV (45)\u003cbr\u003eLow 1.0mV @5 CMV (45)\u003cbr\u003eInductance:\u003cbr\u003eHigh Output 55mH\u003cbr\u003eLow Output 6mH\u003cbr\u003eResistance:\u003cbr\u003eHigh Output 660 ohms\u003cbr\u003eLow Output 70 ohms\u003cbr\u003eInput Load: 10k-47k ohms\u003cbr\u003eCartridge Weight: 8.3 grams\u003cbr\u003eTracking Force: 1.6-1.9 grams\u003cbr\u003eCompliance: 20μm\/mN\u003cbr\u003eChannel Seperation: Average 30db - 10-30k Hz\u003cbr\u003eControlled Frequency Response: 10-60 kHz\u003cbr\u003eNon-Sensative to Capacitive Load\u003cbr\u003eBuilds: High Output, Low Output, Mono\u003c\/p\u003e","brand":"Grado Labs","offers":[{"title":"High 4.0 mV \/ Stereo","offer_id":47387457028236,"sku":null,"price":300.0,"currency_code":"USD","in_stock":true},{"title":"High 4.0 mV \/ Mono","offer_id":47387457061004,"sku":null,"price":300.0,"currency_code":"USD","in_stock":true},{"title":"Low 1.0 mV \/ Stereo","offer_id":47387457093772,"sku":null,"price":300.0,"currency_code":"USD","in_stock":true},{"title":"Low 1.0 mV \/ Mono","offer_id":47387457126540,"sku":null,"price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0730\/3308\/9164\/files\/gradoTimbre-Opus.webp?v=1775755729","url":"https:\/\/www.ttvjaudio.com\/products\/grado-labs-opus4-mi-phono-cartridge","provider":"TTVJ Audio","version":"1.0","type":"link"}