A type of condenser mic where the electrostatic field of the capacitor in generated by an electret, a substance which permanently stores an electrostatic charge.
Electrostatic interference, английский The undesired presence of an electrostatic hum field in signal conductors.
Eia rating, английский A specification of microphone sensitivity that states the microphone output level in dbm into a matched load for a given sound pressure level or spl. the formula is spl + db (eia rating) = dbm output into a matched load.