MIL-E-83510 Earphone Element (S/S By Mil-Prf-25670/1 And Mil-Prf-25670/2)This specification covers a dynamic earphone element having an impedance of 20 ohms with an extended frequency and a flat response (see 6.1). The element is part of the earcup assembly of the M83511/7-01 headset-microphone. The earphone is designed to operate in an ambient peek-noise level of 105 dBA.