64 Audio
U4s
The 64 Audio U4s is a universal-fit in-ear monitor with a quad-driver hybrid topology: one dynamic low driver, one mid driver, one high-mid balanced-armature driver, and one tia high driver. Its anodized aluminum shell incorporates tia, Linear Impedance Design (LID), Apex venting, and an integrated four-way passive crossover with an electrical low-pass filter; included Apex modules provide m20, m15, and mX isolation options. It has a 10 Hz–20 kHz frequency response, 107 dB/mW sensitivity at 1 kHz, and 11 Ω impedance at 1 kHz, and includes a 3.5 mm cable made with silver-plated OCC copper wire.
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