{"product_id":"grado-opus4-phono-cartridge","title":"Grado Opus4 Timber Series High Output Phono Cartridge","description":"\u003cdiv style=\"font-family: 'Helvetica Neue', Arial, sans-serif; background: linear-gradient(135deg, #0a0f1a 0%, #0d1b2e 100%); color: #cce0f5; padding: 40px; border-radius: 12px; max-width: 900px; margin: 0 auto;\"\u003e\n\u003c!-- Header --\u003e\n\u003cdiv style=\"text-align: center; margin-bottom: 40px; padding-bottom: 30px; border-bottom: 2px solid #1a6faf;\"\u003e\n\u003cp style=\"color: #4da6e8; font-size: 13px; letter-spacing: 3px; text-transform: uppercase; margin: 0 0 8px;\"\u003eGrado Timbre Series\u003c\/p\u003e\n\u003ch1 style=\"font-size: 36px; font-weight: bold; margin: 0 0 12px; color: #e8f4ff;\"\u003eOpus4\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0855\/3670\/2749\/files\/Screenshot_2026-04-21_133910.jpg?v=1776796859\"\u003e\n\u003c\/h1\u003e\n\u003cp style=\"font-size: 16px; color: #7aafd4; max-width: 600px; margin: 0 auto; line-height: 1.6;\"\u003eThe foundation of Grado's wood body cartridge line — balanced, musical, and built on decades of moving iron expertise.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Feature Boxes --\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 36px;\"\u003e\n\u003cdiv style=\"background: rgba(26, 111, 175, 0.15); border: 1px solid #1a6faf; border-radius: 10px; padding: 20px; text-align: center;\"\u003e\n\u003ch3 style=\"color: #4da6e8; font-size: 13px; letter-spacing: 2px; text-transform: uppercase; margin: 0 0 6px;\"\u003eMoving Iron Design\u003c\/h3\u003e\n\u003cp style=\"color: #7aafd4; font-size: 13px; margin: 0; line-height: 1.5;\"\u003eFlux-bridger principle for low moving mass and long-term reliability\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(13, 60, 110, 0.3); border: 1px solid #1e5c99; border-radius: 10px; padding: 20px; text-align: center;\"\u003e\n\u003ch3 style=\"color: #4da6e8; font-size: 13px; letter-spacing: 2px; text-transform: uppercase; margin: 0 0 6px;\"\u003eElliptical Diamond\u003c\/h3\u003e\n\u003cp style=\"color: #7aafd4; font-size: 13px; margin: 0; line-height: 1.5;\"\u003eBonded elliptical diamond on aluminum cantilever for reliable tracking\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(10, 45, 90, 0.4); border: 1px solid #1a6faf; border-radius: 10px; padding: 20px; text-align: center;\"\u003e\n\u003ch3 style=\"color: #4da6e8; font-size: 13px; letter-spacing: 2px; text-transform: uppercase; margin: 0 0 6px;\"\u003eAmerican Maple Body\u003c\/h3\u003e\n\u003cp style=\"color: #7aafd4; font-size: 13px; margin: 0; line-height: 1.5;\"\u003eWood housing selected for resonance control and tonal balance\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(26, 111, 175, 0.1); border: 1px solid #1e5c99; border-radius: 10px; padding: 20px; text-align: center;\"\u003e\n\u003ch3 style=\"color: #4da6e8; font-size: 13px; letter-spacing: 2px; text-transform: uppercase; margin: 0 0 6px;\"\u003e5N OCC Copper\u003c\/h3\u003e\n\u003cp style=\"color: #7aafd4; font-size: 13px; margin: 0; line-height: 1.5;\"\u003eUltra-high purity coil winding with cryogenic treatment\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Performance Section --\u003e\n\u003cdiv style=\"background: rgba(13, 40, 75, 0.5); border-radius: 10px; padding: 28px; margin-bottom: 28px;\"\u003e\n\u003ch2 style=\"color: #4da6e8; font-size: 14px; letter-spacing: 3px; text-transform: uppercase; margin: 0 0 16px;\"\u003ePerformance\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0298\/1665\/1824\/t\/3\/assets\/e3c6ebb5d460--Cartridges-017.jpg?v=1775589387\"\u003e\n\u003c\/h2\u003e\n\u003cp style=\"color: #7aafd4; font-size: 15px; line-height: 1.8; margin: 0 0 14px;\"\u003eOpus4 delivers a balanced and controlled presentation — clear detail, a smooth natural top end, and a midrange that carries genuine presence and warmth. Low frequencies remain defined and composed without overhang.\u003c\/p\u003e\n\u003cp style=\"color: #7aafd4; font-size: 15px; line-height: 1.8; margin: 0;\"\u003eRecordings are presented with stability and coherence, maintaining separation and musical flow while allowing the character of the source to come through naturally. Available in both high and low output configurations for broad phono stage compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Full Specifications Table --\u003e\n\u003cdiv style=\"background: #080e1a; border-radius: 10px; padding: 28px; margin-bottom: 28px;\"\u003e\n\u003ch2 style=\"color: #4da6e8; font-size: 14px; letter-spacing: 3px; text-transform: uppercase; margin: 0 0 24px;\"\u003eSpecifications\u003c\/h2\u003e\n\u003c!-- Construction --\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 2px; margin: 0 0 12px; padding-bottom: 6px; border-bottom: 1px solid #0f2540;\"\u003eConstruction\u003c\/p\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; margin-bottom: 24px;\"\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eBody\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003eAmerican Maple Wood\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eCantilever \/ Stylus\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003eAluminum \/ Elliptical Diamond\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eCartridge Weight\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003e8.3 grams\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Output \u0026 Electrical --\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 2px; margin: 0 0 12px; padding-bottom: 6px; border-bottom: 1px solid #0f2540;\"\u003eOutput \u0026amp; Electrical\u003c\/p\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; margin-bottom: 24px;\"\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eOutput — High\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003e4.0 mV @ 5 cm\/s (45)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eOutput — Low\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003e1.0 mV @ 5 cm\/s (45)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eInductance — High\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003e55 mH\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eInductance — Low\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003e6 mH\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eResistance — High\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003e660 ohms\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eResistance — Low\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003e70 ohms\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eInput Load\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003e10k – 47k ohms\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eCapacitive Load\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003eNon-Sensitive\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Tracking \u0026 Response --\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 2px; margin: 0 0 12px; padding-bottom: 6px; border-bottom: 1px solid #0f2540;\"\u003eTracking \u0026amp; Response\u003c\/p\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px;\"\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eTracking Force\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003e1.6 – 1.9 grams\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eCompliance\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003e20 μm\/mN\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eChannel Separation\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003eAvg. 30 dB (10 – 30k Hz)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border-left: 3px solid #1a6faf; padding-left: 14px;\"\u003e\n\u003cp style=\"color: #3a6a99; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 4px;\"\u003eFrequency Response\u003c\/p\u003e\n\u003cp style=\"color: #cce0f5; font-size: 14px; font-weight: 600; margin: 0;\"\u003e10 – 60 kHz (controlled)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Moving Iron Section --\u003e\n\u003cdiv style=\"background: rgba(13, 40, 75, 0.5); border-radius: 10px; padding: 28px; margin-bottom: 28px;\"\u003e\n\u003ch2 style=\"color: #4da6e8; font-size: 14px; letter-spacing: 3px; text-transform: uppercase; margin: 0 0 16px;\"\u003eThe Grado Moving Iron Advantage\u003c\/h2\u003e\n\u003cp style=\"color: #7aafd4; font-size: 15px; line-height: 1.8; margin: 0;\"\u003eAll Grado cartridges are built on Joseph Grado's patented flux-bridger principle — a moving iron design that keeps the coil structure fixed while the iron element moves. The result is extremely low moving mass, a precise signal path, and a presentation that combines speed, control, and harmonic integrity without the fragility often associated with traditional moving coil systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Compatibility --\u003e\n\u003cdiv style=\"text-align: center; background: rgba(26, 111, 175, 0.12); border: 1px solid #1a6faf; border-radius: 10px; padding: 24px;\"\u003e\n\u003ch2 style=\"color: #4da6e8; font-size: 13px; letter-spacing: 3px; text-transform: uppercase; margin: 0 0 12px;\"\u003eAvailable Builds\u003c\/h2\u003e\n\u003cp style=\"color: #cce0f5; font-size: 15px; margin: 0 0 8px;\"\u003eHigh Output  \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Grado","offers":[{"title":"Default Title","offer_id":51191675126045,"sku":null,"price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0855\/3670\/2749\/files\/GradoOpus.jpg?v=1776797321","url":"https:\/\/skylabsaudio.com\/products\/grado-opus4-phono-cartridge","provider":"Skylabs ","version":"1.0","type":"link"}