equivalent threshold level

11.23  equivalent threshold level. For monaural listening, at a specified frequency, for a specified type of transducer, and for a stated force of application of the transducer to the human head, the vibration level, or sound pressure level set up by that transducer in a specified coupler or artificial ear when the transducer is activated by that voltage which, with the transducer applied to the ear concerned, would correspond with the hearing threshold. Unit, decibel (dB).