Custom 2.8i Carbon Fiber DiaphragmLightweight yet ultra-rigid, maximizing sound radiation area in compact spaces for precise detail reproduction. Dual-Neodymium Magnetic SystemHigh-strength magnets with vented pole piece ensure uniform magnetic flux and stable output. CCAR Voice Coil TechnologyCopper-Clad Aluminum Ribbon coil delivers low moving mass and high power handling. Automotive-Optimized EnduranceMaterials engineered to withstand harsh in-car environments (heat/vibration/humidity). Structured Product Description Unleash Powerful Sound in Compact SpacesEngineered for automotive acoustics, the So Dome Midrange M28i delivers energy beyond its size with precision craftsmanship. Breakthrough Acoustic Design Carbon Fiber Diaphragm: The custom 2.8" unit maximizes effective radiating area within minimal depth, accurately reproducing vocal and instrumental textures. Dual Neodymium Drive: High-strength magnets with large pole piece eliminate magnetic distortion, guaranteeing stable output even at high SPL. Rugged Chassis: Ribbed iron frame provides structural integrity while optimizing spatial adaptability. Signature Sonic Performance Naturally warm midrange with rich emotional expression High power capacity and ultra-low distortion maintain vocal clarity and layering at extreme volumes All-weather resilience against temperature swings and road vibrations M28i upholds the MAD Series philosophy: Uncompromising sonic truth through science.