{"product_id":"grado-prestige-red4-cartridge","title":"Grado Prestige Red4 Cartridge","description":"\u003ch1\u003eGrado Red4 Phono Cartridge\u003c\/h1\u003e\n\u003ch3\u003eA Prestige Series moving iron cartridge with bonded elliptical diamond, aluminum cantilever, and standard or P-mount options\u003c\/h3\u003e\n\u003cp\u003eThe Grado Red4 is part of Grado’s Prestige Series, designed as a balanced, high-output cartridge with broad system compatibility. It maintains the core performance principles that define Grado cartridges while offering dependable performance in an accessible cartridge body.\u003c\/p\u003e\n\u003cp\u003eLike all Grado cartridges, the Red4 is built around a moving iron design based on Joseph Grado’s patented flux-bridger principle. This keeps the coil structure fixed while using low moving mass to generate the signal, giving the cartridge a combination of speed, control, and long-term consistency.\u003c\/p\u003e\n\u003cp\u003eThe Red4 uses a bonded elliptical diamond mounted to an aluminum cantilever, with an internal signal path made from ultra-high purity 5N OCC copper. Each cartridge also undergoes cryogenic treatment and internal damping to help reduce unwanted resonance and preserve signal integrity.\u003c\/p\u003e\n\u003ch4\u003eStandard Mount and P-Mount Options\u003c\/h4\u003e\n\u003cp\u003eRed4 is offered in both standard mount and P-mount configurations, making it suitable for a wide range of turntables and tonearms. Its high-output design is intended for compatibility with standard moving magnet phonostages.\u003c\/p\u003e\n\u003ch4\u003eMoving Iron Design\u003c\/h4\u003e\n\u003cp\u003eGrado’s moving iron architecture is designed to combine the low moving mass often associated with moving coil cartridges with the practical stability of a fixed-coil design. The result is a cartridge intended to deliver clarity, separation, and tonal integrity without requiring a fragile moving coil assembly.\u003c\/p\u003e\n\u003ch4\u003eDiamond and Cantilever\u003c\/h4\u003e\n\u003cp\u003eThe bonded elliptical diamond provides effective groove contact and reliable tracking, while the aluminum cantilever contributes to a stable and controlled presentation. This pairing supports the Red4’s balanced response, smooth top end, and defined low-frequency performance.\u003c\/p\u003e\n\u003ch4\u003ePrestige Series Construction\u003c\/h4\u003e\n\u003cp\u003eThe Red4 uses a die-injection molded housing for consistent construction and dependable performance. The stylus assembly is user-replaceable, and Prestige Series styli are interchangeable for flexible long-term ownership.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eGenerator Type:\u003c\/b\u003e Moving iron\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCantilever and Stylus:\u003c\/b\u003e Aluminum cantilever with bonded elliptical diamond\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput:\u003c\/b\u003e 4 mV @ 5 CMV (45°)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInductance:\u003c\/b\u003e 50 mH\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eResistance:\u003c\/b\u003e 660 Ω\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Load:\u003c\/b\u003e 10 kΩ–47 kΩ\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTracking Force:\u003c\/b\u003e 1.6 g–1.9 g\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCompliance:\u003c\/b\u003e 20 µm\/mN\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eChannel Separation:\u003c\/b\u003e Average 25 dB, 10 Hz–30 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFrequency Response:\u003c\/b\u003e 10 Hz–55 kHz\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMounting:\u003c\/b\u003e P-mount or 1\/2\" screw mount\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight:\u003c\/b\u003e 6 g\u003c\/p\u003e","brand":"Grado","offers":[{"title":"Default Title","offer_id":53416607842488,"sku":"RED4","price":190.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/Red-4_png.webp?v=1780332735","url":"https:\/\/upscaleaudio.com\/products\/grado-prestige-red4-cartridge","provider":"Upscale Audio","version":"1.0","type":"link"}