Our Flagship 9-driver model is a hybrid system designed for everyone who requires the most accurate sonic profile. It features a precision-calibrated large diameter dynamic driver together with four Super-High drivers. Housed in an acoustically-optimized composite material that is soft and resilient, the Stealth Sonics U9 IEM reproduces extreme detail and covers our widest frequency range of 18 Hz to 40 kHz. The sound signature is supported by a deep bass response, beautifully transparent mid-range and crystal-clear open highs that are powered by four Super-High drivers. Crisp transients and an immersive soundstage round out truly superior listening experience.