A high-quality condenser earphone will be described in this paper. It consists of a solid backplate and a metallized mylar foil which is stretched across the backplate. Its frequency response is within ±1.5 db between 25 and 14,000 cps and within ±3 db between 20 and 16,500 cps. In this frequency range the harmonic distortion is less than 1% and the intermodulation distortion is less than 3% at 100 db SPL. The earphone shows an impulse response which is an almost true image of the applied voltage. The high quality of this earphone makes it useful for many purposes particularly in psycho-acoustic experiments.
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