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The four-driver U4 in-ear monitor features a balanced armature design favored by anyone seeking the flattest response possible. Housed in acoustically-optimized composite material that is soft and resilient, the Stealth Sonics U4 IEM offers advanced detail and crisp transients and covers a frequency range of 18 Hz to 23 kHz. The sound signature is supported by a punchy bass, a silky midrange and crystal-clear highs for a fully balanced listening experience.