Measurements by Hangout.Audio The Softears RS10 features a sophisticated 5-way crossover design that rivals high-end reference loudspeakers. Its components include 2 band-pass filters, a low-pass filter, and a 4th order LC filter, ensuring precise impedance and frequency control. This results in nearly perfect phase-impedance consistency across all audible frequencies. Special attention has been given to the higher midrange frequencies to match the natural hearing of human ears in studio conditions. What You Get Softears RS10 IEM (10BA) Detachable high-purity oxygen-free silver-plated cable 3 pairs of silicone tips of a variety of sizes (S/M/L) Cleaning cloth 2 IEM protective pouches Premium Leather IEM carrying case Specs Sensitivity:100dB/100mVImpedance:25@1kHzFrequency Response:20Hz-40HzDistortion: THD