Measurements by Hangout.Audio The Softears Studio4 is a professional-grade multi-BA driver IEM featuring four custom BA drivers in 3D-printed resin ear shells. It offers a flat frequency response for accurate, natural sound, ideal for studio recording, stage monitoring, and audiophiles. With a three-way frequency crossover and high-resolution clarity, it ensures consistent phase response across frequency bands. The IEMs are designed for comfort and durability, using medical-grade resin and including a high-purity twisted braided oxygen-free copper cable with standard connectors. Perfect for studio engineers, stage performers, and audio enthusiasts seeking high-fidelity sound. What You Get Softears Studio 4 IEM (4BA) Detachable high-purity oxygen-free silver-plated copper cable Extension cable 3 pairs of silicone tips of a variety of sizes (S/M/L) Cleaning cloth Cleaning tool 2 IEM protective pouches IEM carrying case Specs Impedance:12Ω@1kHz Sensitivity:123dB/VRMS@1kHz Interface specification:0.78mm-2pin Shell: medical resin 3D printing THD: