This paper presents an electret receiver developed for in-ear earphone. The electret diaphragm is fabricated by nano-porous fluoropolymer and charged by the corona method at room temperature. The electret diaphragm is driven to vibrate as a piston motion and sound by the electrostatic force while the audio signal is applied. The influence factors, such as electrostatic charge quantities of electret diaphragm and distance between the electrode plate and diaphragm, are investigated to promote the output sound pressure level of the in-ear earphone. An enclosure with resonator is also design to improve the efficient performance of the in-ear earphone. Consequently, the output sound pressure inside the 2cc coupler can be lifted to exceed 105dB at 1 kHz with the driving voltage of sound signal Vpp=?}3V and remarkably enlarge the output sound pressure level response at low frequency.
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