{"product_id":"grado-red4-phono-cartridge","title":"Grado Red4 Phono Cartridge","description":"\u003cdiv style=\"font-family: 'Helvetica Neue', Arial, sans-serif; background: linear-gradient(135deg, #0a1628 0%, #0d1f3c 100%); color: #cdd9e8; padding: 40px; border-radius: 12px; max-width: 960px; margin: 0 auto;\"\u003e\n\u003c!-- Header --\u003e\n\u003cdiv style=\"text-align: center; margin-bottom: 40px; padding-bottom: 30px; border-bottom: 2px solid #1a6bb5;\"\u003e\n\u003ch1 style=\"font-size: 2.2em; color: #4a9edd; margin: 0 0 8px;\"\u003eGrado Red4\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0855\/3670\/2749\/files\/Screenshot_2026-04-15_162742.jpg?v=1776288478\" alt=\"\"\u003e\n\u003c\/h1\u003e\n\u003cp style=\"font-size: 1.1em; color: #5a7fa8; margin: 0;\"\u003ePrestige Series · Moving Iron Phono Cartridge\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Overview --\u003e\n\u003cdiv style=\"background: rgba(26,107,181,0.12); border-left: 4px solid #1a6bb5; border-radius: 8px; padding: 24px; margin-bottom: 32px;\"\u003e\n\u003cp style=\"margin: 0; font-size: 1.05em; line-height: 1.7; color: #a8bfd4;\"\u003ePart of the Grado Prestige Series, the Red4 delivers a balanced and engaging presentation built on decades of cartridge design experience. It maintains the core performance principles that define Grado cartridges while offering broad system compatibility — controlled, coherent, and consistently musical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Feature Boxes --\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; margin-bottom: 36px;\"\u003e\n\u003cdiv style=\"background: rgba(26,107,181,0.15); border: 1px solid #1a6bb5; border-radius: 10px; padding: 20px;\"\u003e\n\u003cdiv style=\"font-size: 1.5em; margin-bottom: 8px;\"\u003e●\u003c\/div\u003e\n\u003ch3 style=\"color: #4a9edd; margin: 0 0 8px; font-size: 1em; text-transform: uppercase; letter-spacing: 0.05em;\"\u003eMoving Iron Design\u003c\/h3\u003e\n\u003cp style=\"margin: 0; color: #a8bfd4; font-size: 0.92em; line-height: 1.6;\"\u003eBuilt on Joseph Grado's patented flux-bridger principle — extremely low moving mass, fixed coil, and long-term signal consistency without the fragility of moving coil designs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(13,55,110,0.4); border: 1px solid #1e5a9c; border-radius: 10px; padding: 20px;\"\u003e\n\u003cdiv style=\"font-size: 1.5em; margin-bottom: 8px;\"\u003e◆\u003c\/div\u003e\n\u003ch3 style=\"color: #6ab0e8; margin: 0 0 8px; font-size: 1em; text-transform: uppercase; letter-spacing: 0.05em;\"\u003eBonded Elliptical Diamond\u003c\/h3\u003e\n\u003cp style=\"margin: 0; color: #a8bfd4; font-size: 0.92em; line-height: 1.6;\"\u003eElliptical profile on an aluminum cantilever for effective groove contact, reliable tracking, and a stable, controlled presentation across a wide range of recordings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(20,80,150,0.2); border: 1px solid #2470b8; border-radius: 10px; padding: 20px;\"\u003e\n\u003cdiv style=\"font-size: 1.5em; margin-bottom: 8px;\"\u003e↻\u003c\/div\u003e\n\u003ch3 style=\"color: #5ba8e0; margin: 0 0 8px; font-size: 1em; text-transform: uppercase; letter-spacing: 0.05em;\"\u003eUser-Replaceable Stylus\u003c\/h3\u003e\n\u003cp style=\"margin: 0; color: #a8bfd4; font-size: 0.92em; line-height: 1.6;\"\u003eThe stylus assembly is easily user-replaceable. All Prestige Series styli are interchangeable, offering long-term ownership flexibility across models.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(10,40,90,0.5); border: 1px solid #163d7a; border-radius: 10px; padding: 20px;\"\u003e\n\u003cdiv style=\"font-size: 1.5em; margin-bottom: 8px;\"\u003e◆\u003c\/div\u003e\n\u003ch3 style=\"color: #7bbfed; margin: 0 0 8px; font-size: 1em; text-transform: uppercase; letter-spacing: 0.05em;\"\u003e5N OCC Copper \u0026amp; Cryo Treatment\u003c\/h3\u003e\n\u003cp style=\"margin: 0; color: #a8bfd4; font-size: 0.92em; line-height: 1.6;\"\u003eUltra-high purity 5N OCC copper internal signal path with cryogenic treatment and internal damping to reduce resonance and preserve signal integrity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Technical Specifications --\u003e\n\u003cdiv style=\"background: #071020; border-radius: 10px; padding: 28px; margin-bottom: 32px;\"\u003e\n\u003ch2 style=\"color: #4a9edd; font-size: 1.1em; text-transform: uppercase; letter-spacing: 0.08em; margin: 0 0 20px; border-bottom: 1px solid #1a3a5c; padding-bottom: 12px;\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 12px;\"\u003e\n\u003cdiv style=\"background: rgba(26,107,181,0.08); border: 1px solid #1a3a5c; border-radius: 8px; padding: 14px 18px; display: flex; justify-content: space-between; align-items: center;\"\u003e\n\u003cspan style=\"color: #5a7fa8; font-size: 0.88em; text-transform: uppercase; letter-spacing: 0.04em;\"\u003eOutput\u003c\/span\u003e\n\u003cspan style=\"color: #cdd9e8; font-size: 0.95em; font-weight: 500;\"\u003e4 mV @ 5 CMV (45°)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(26,107,181,0.08); border: 1px solid #1a3a5c; border-radius: 8px; padding: 14px 18px; display: flex; justify-content: space-between; align-items: center;\"\u003e\n\u003cspan style=\"color: #5a7fa8; font-size: 0.88em; text-transform: uppercase; letter-spacing: 0.04em;\"\u003eFrequency Response\u003c\/span\u003e\n\u003cspan style=\"color: #cdd9e8; font-size: 0.95em; font-weight: 500;\"\u003e10–55,000 Hz\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(26,107,181,0.08); border: 1px solid #1a3a5c; border-radius: 8px; padding: 14px 18px; display: flex; justify-content: space-between; align-items: center;\"\u003e\n\u003cspan style=\"color: #5a7fa8; font-size: 0.88em; text-transform: uppercase; letter-spacing: 0.04em;\"\u003eChannel Separation\u003c\/span\u003e\n\u003cspan style=\"color: #cdd9e8; font-size: 0.95em; font-weight: 500;\"\u003eAvg 25 dB, 10–30,000 Hz\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(26,107,181,0.08); border: 1px solid #1a3a5c; border-radius: 8px; padding: 14px 18px; display: flex; justify-content: space-between; align-items: center;\"\u003e\n\u003cspan style=\"color: #5a7fa8; font-size: 0.88em; text-transform: uppercase; letter-spacing: 0.04em;\"\u003eStylus\u003c\/span\u003e\n\u003cspan style=\"color: #cdd9e8; font-size: 0.95em; font-weight: 500;\"\u003eDiamond Elliptical\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(26,107,181,0.08); border: 1px solid #1a3a5c; border-radius: 8px; padding: 14px 18px; display: flex; justify-content: space-between; align-items: center;\"\u003e\n\u003cspan style=\"color: #5a7fa8; font-size: 0.88em; text-transform: uppercase; letter-spacing: 0.04em;\"\u003eInput Load\u003c\/span\u003e\n\u003cspan style=\"color: #cdd9e8; font-size: 0.95em; font-weight: 500;\"\u003e10k–47k ohms\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(26,107,181,0.08); border: 1px solid #1a3a5c; border-radius: 8px; padding: 14px 18px; display: flex; justify-content: space-between; align-items: center;\"\u003e\n\u003cspan style=\"color: #5a7fa8; font-size: 0.88em; text-transform: uppercase; letter-spacing: 0.04em;\"\u003eInductance\u003c\/span\u003e\n\u003cspan style=\"color: #cdd9e8; font-size: 0.95em; font-weight: 500;\"\u003e50 mH\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(26,107,181,0.08); border: 1px solid #1a3a5c; border-radius: 8px; padding: 14px 18px; display: flex; justify-content: space-between; align-items: center;\"\u003e\n\u003cspan style=\"color: #5a7fa8; font-size: 0.88em; text-transform: uppercase; letter-spacing: 0.04em;\"\u003eDC Resistance\u003c\/span\u003e\n\u003cspan style=\"color: #cdd9e8; font-size: 0.95em; font-weight: 500;\"\u003e660 ohms\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(26,107,181,0.08); border: 1px solid #1a3a5c; border-radius: 8px; padding: 14px 18px; display: flex; justify-content: space-between; align-items: center;\"\u003e\n\u003cspan style=\"color: #5a7fa8; font-size: 0.88em; text-transform: uppercase; letter-spacing: 0.04em;\"\u003eCartridge Weight\u003c\/span\u003e\n\u003cspan style=\"color: #cdd9e8; font-size: 0.95em; font-weight: 500;\"\u003e6 grams\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(26,107,181,0.08); border: 1px solid #1a3a5c; border-radius: 8px; padding: 14px 18px; display: flex; justify-content: space-between; align-items: center;\"\u003e\n\u003cspan style=\"color: #5a7fa8; font-size: 0.88em; text-transform: uppercase; letter-spacing: 0.04em;\"\u003eTracking Force\u003c\/span\u003e\n\u003cspan style=\"color: #cdd9e8; font-size: 0.95em; font-weight: 500;\"\u003e1.6–1.9 grams\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(26,107,181,0.08); border: 1px solid #1a3a5c; border-radius: 8px; padding: 14px 18px; display: flex; justify-content: space-between; align-items: center;\"\u003e\n\u003cspan style=\"color: #5a7fa8; font-size: 0.88em; text-transform: uppercase; letter-spacing: 0.04em;\"\u003eCompliance\u003c\/span\u003e\n\u003cspan style=\"color: #cdd9e8; font-size: 0.95em; font-weight: 500;\"\u003e20 µm\/mN\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: rgba(26,107,181,0.08); border: 1px solid #1a3a5c; border-radius: 8px; padding: 14px 18px; display: flex; justify-content: space-between; align-items: center;\"\u003e\n\u003cspan style=\"color: #5a7fa8; font-size: 0.88em; text-transform: uppercase; letter-spacing: 0.04em;\"\u003eMounting\u003c\/span\u003e\n\u003cspan style=\"color: #cdd9e8; font-size: 0.95em; font-weight: 500;\"\u003eP-Mount or ½\" Screw Mount\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Compatibility --\u003e\n\u003cdiv style=\"text-align: center; background: rgba(26,107,181,0.1); border: 1px solid #1a6bb5; border-radius: 10px; padding: 24px;\"\u003e\n\u003ch2 style=\"color: #4a9edd; font-size: 1em; text-transform: uppercase; letter-spacing: 0.08em; margin: 0 0 12px;\"\u003eMounting Compatibility\u003c\/h2\u003e\n\u003cp style=\"margin: 0; color: #a8bfd4; font-size: 0.97em;\"\u003eAvailable in \u003cstrong style=\"color: #cdd9e8;\"\u003eP-Mount\u003c\/strong\u003e and \u003cstrong style=\"color: #cdd9e8;\"\u003e½\" Standard Screw Mount\u003c\/strong\u003e configurations for broad tonearm compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Grado","offers":[{"title":"Default Title","offer_id":51174558728477,"sku":null,"price":190.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0855\/3670\/2749\/files\/PrestigeRed.jpg?v=1776289006","url":"https:\/\/skylabsaudio.com\/products\/grado-red4-phono-cartridge","provider":"Skylabs ","version":"1.0","type":"link"}