{"product_id":"grado-red4-phono-cartridge","title":"Grado Red4 Phono Cartridge","description":"\u003cp\u003eThe Grado Red4 is the mid-range model in Grado's Prestige Series, offering tighter component grading than the entry-level Green4. Like all Grado cartridges, the Red4 uses the company's patented flux-bridger moving iron generator, which provides the transient speed of moving coil designs with standard moving magnet output levels. It's a plug-and-play upgrade for any turntable with a standard 1\/2\" mount headshell.\u003c\/p\u003e\n\n\u003ch5\u003eKey Features of the Grado Red4\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eElliptical Diamond Stylus:\u003c\/strong\u003e User-replaceable, dual-radius contact profile for balanced tracking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlux-Bridger Moving Iron Generator:\u003c\/strong\u003e Grado's patented design, with mid-tier component grading.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOFC Copper Coils:\u003c\/strong\u003e Oxygen-free copper windings, hand-wound at Grado's Brooklyn facility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4.0mV Output:\u003c\/strong\u003e Standard moving magnet level, compatible with any MM phono input.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUser-Replaceable Stylus:\u003c\/strong\u003e Snap-in stylus assembly for easy replacement or upgrade.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 1\/2\" Mount:\u003c\/strong\u003e Fits any standard headshell or tonearm.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHand-Built in Brooklyn, NY:\u003c\/strong\u003e Assembled and voiced at Grado's Sunset Park facility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch5\u003eAbout Grado Labs\u003c\/h5\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0555\/5073\/8528\/files\/red4-inline-01.jpg\" alt=\"Grado Red4 phono cartridge\" style=\"width:100%;max-width:1000px;height:auto;border-radius:12px;margin:16px 0;\"\u003e\n\u003cp\u003eGrado Labs has been building phono cartridges and headphones by hand in Brooklyn, New York since 1953. The company was founded by Joseph Grado, and four generations of the Grado family have since refined the company's patented flux-bridger moving iron generator system, which delivers the speed and detail retrieval associated with moving coil designs while keeping the higher output and simpler loading requirements of moving magnet cartridges. Every Grado cartridge is still assembled, tested, and voiced in the same Sunset Park facility where Joseph first began his work over seven decades ago. Nothing about the operation has been outsourced, automated, or moved offshore.\u003c\/p\u003e\n\n\u003ch5\u003eWhy Flux-Bridger Matters\u003c\/h5\u003e\n\u003cp\u003eGrado's flux-bridger generator pairs the low moving mass associated with moving coil cartridges with the 4.0mV output and standard MM loading of a moving magnet. That means the Red4 works straight into the phono input on any integrated amplifier, receiver, or basic phono preamp. No step-up transformer, no specialized loading, no MC-capable phono stage required. Plug it in, set tracking force to 1.5 grams, and the rest of the system can stay as it is.\u003c\/p\u003e\n\n\u003ch5\u003ePrestige Series Grading\u003c\/h5\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0555\/5073\/8528\/files\/red4-inline-02.jpg\" alt=\"Grado Red4 cartridge detail\" style=\"width:100%;max-width:1000px;height:auto;border-radius:12px;margin:16px 0;\"\u003e\n\u003cp\u003eThe Red4 shares its body, stylus type, generator design, and coil material with the \u003ca href=\"\/products\/grado-green4-phono-cartridge\"\u003eGreen4\u003c\/a\u003e and \u003ca href=\"\/products\/grado-gold4-phono-cartridge\"\u003eGold4\u003c\/a\u003e. The difference is in how tightly components are matched during hand-assembly in Brooklyn. The Red4's mid-tier grading produces measurable improvements in channel separation and distortion over the Green4, while the Gold4 pushes tolerancing further still. All three accept the same replacement styli, so you can upgrade from Red4 to Gold4-level performance with just a stylus swap, no cartridge return required. When you've outgrown the Prestige Series, the wood-bodied \u003ca href=\"\/collections\/grado-timbre-cartridges\"\u003eTimbre Series\u003c\/a\u003e adds a wood housing and OCC copper coils with a three-piece OTL aluminum cantilever. The Gold4 is the natural last stop in Prestige before that jump.\u003c\/p\u003e\n\n\u003ch5\u003eThe Listening Room Difference\u003c\/h5\u003e\n\u003cp\u003eWe're a third-generation family business with a brick-and-mortar showroom in Chestertown, Maryland, and a reputation built on exceptional service and relentless passion for hifi. Whether you're visiting in person or ordering online, we bring decades of experience, personalized service, and honest guidance to every interaction. We don't just ship boxes. We help build systems, answer your questions like real humans, and make sure every detail of your setup is right, from the cables to the final connection. Our passion is helping you get the most out of your gear, with support that lasts well beyond the sale.\u003c\/p\u003e\n\n\u003ch5\u003eGrado Red4 Specifications\u003c\/h5\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;width:34%;\"\u003e\u003cb\u003eCartridge Type\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;width:66%;\"\u003eMoving Iron (Flux-Bridger)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;width:34%;\"\u003e\u003cb\u003eStylus\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;width:66%;\"\u003eElliptical Diamond (User-Replaceable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;width:34%;\"\u003e\u003cb\u003eCantilever\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;width:66%;\"\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;width:34%;\"\u003e\u003cb\u003eOutput Voltage\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;width:66%;\"\u003e4.0mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;width:34%;\"\u003e\u003cb\u003eCoil Wire\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;width:66%;\"\u003eOFC Copper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;width:34%;\"\u003e\u003cb\u003eBody Material\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;width:66%;\"\u003ePolymer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;width:34%;\"\u003e\u003cb\u003eTracking Force\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;width:66%;\"\u003e1.5 grams\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;width:34%;\"\u003e\u003cb\u003eCartridge Weight\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;width:66%;\"\u003e5.5 grams\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;width:34%;\"\u003e\u003cb\u003eCompliance\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;width:66%;\"\u003e20 µm\/mN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;width:34%;\"\u003e\u003cb\u003eMount\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;width:66%;\"\u003eStandard ½\" Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background-color:#f3f3f3;padding:12px;width:34%;\"\u003e\u003cb\u003eOrigin\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:12px;width:66%;\"\u003eHand-built in Brooklyn, NY, USA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Grado","offers":[{"title":"Default Title","offer_id":42681461702752,"sku":"GRADRED4","price":190.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/5073\/8528\/files\/grado-red4-amazon-front.jpg?v=1775506996","url":"https:\/\/listenroom.com\/products\/grado-red4-phono-cartridge","provider":"The Listening Room","version":"1.0","type":"link"}