◉ Aluminum-Magnesium Alloy Dome Composite Diaphragm, High-End Headphone Diaphragm Materials. ◉ Alloy Casting Cavity, Ensuring Durability and High-Quality Texture. ◉ The nozzle of the CHU II consists of a separate brass CNC component, offering higher precision and density. ◉ CHU II incorporates a new generation of replaceable acoustic filters. ◉ CHU II was tuned by senior acoustic engineers and audiophiles with rich knowledge and wide experience, and exhibits an excellent frequency response curve in line with the VDSF Target Response. ◉ Ultra-low Nonlinear Distortion, Reproduction of Subtle Details.