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Abstract
A new making transducer is presented which uses a large moving coil driving unit acoustically shielded in a plastic shell. Sound waves are conveyed to the ear by means of a flexible plastic tube and an insert nipple. In tests made under normal clinical situations, it has been found ot provide an interaural isolation from 20-50 dB better than the conventional supra-aural audio-metric earphone and 16-34 dB better than the common hearing-aid type of insert erphone, while being more rugged and more reliable than the latter. It is therefore proposed as a supplementary tool to the clinician, for masking in all cases where other types of transducers are inadequate