Military Type M-87Type: Dynamic Frequency Range: 200 - 6000 Hz Sensitivity: 1.8-4 MV @ kHz re 74db SPL Impedance: 4-6 Ω Distortion: < 6% @ 114 dBSPL / 200 - 6000 Hz Altitude Compensation: 50,000 feet Weight: ≤ 45 grams MIL-PRF-26542/2
