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EPL Acoustic System

The EPL Acoustic System is designed for use in small animals such as mice and guinea pigs.  It has two miniature dynamic earphones, whose outputs mix, and a miniature electret microphone coupled to a small probe tube to measure sound pressure at the tip of the nosepiece (Fig.1).  This system produces high output (>90 dB SPL) from ~100 Hz to ~60kHz (Fig. 2).  The microphone is used for calibrating the earphone outputs when the system is in the ear canal and is suitable for measuring otoacoustic emissions (OAEs) such as distortion product (DP)OAEs.  The acoustic system is under continued development at EPL.  To receive updates about improvements, register your use of the system at EPL (

Download EPL Acoustic System Assembly Manual (PDF).