Technical Specifications - Drivers: 4 ESTs + 8 BA “Knowles & Sonion” Switches: 3 Tuning Switches (9 style options) Sensitivity: >110dB SPL/MW Impedance: 30Ω Frequency Response: 10Hz – 40kHz Distortion Rate: > 0.5 % (1kHz) Channel Difference: <1dB Related Power: 10mW