PURPOSE: To provide a 'method for three-dimensional stereophonic reproduction for earphone listening' wherein information on 'difference in arrival time between sound pressure level difference and phase difference of sound reaching the right and left eardrums', explained as both-ear effects, is used for discriminating between the right and left directions and information for discriminating between the front and rear directions or top and bottom directions where the former information has a value '0' is transmitted as on 'change in timbre characteristics that shapes of the right and left pinnas give to an 'arrival sound', and to provide related acoustic equipments such as a three-dimensional stereophonic reproduction signal detector, a microphone, records, earphones and a hearing aid comprising them.

CONSTITUTION: A three-dimensional stereophonic reproducing device which utilizes the effects of the ear shapes is composed of signal detection part which detects sound collected at the entrances E1 and E2 of the right and left external auditory meatuses of a virtual listener Q1 in an original sound field with microphones M1 and M2 installed there, the records REC, etc., used for collecting and transmitting detected signals, and a reproduction part which reproduces the signals with the earphones Y1 and Y2 at the entrances E1 and E2 of the right and left external auditory meatuses of a listener Q2.