Abstract: In stereophonic reproduction using a dummy head process, the frequency responses of the microphones are equalized by free-field matching filters to provide overall transfer constants independent of frequency. Signals produced by the above-equalized dummy head apparatus are applied to a decoupling filter which corrects for the directional pattern of the dummy head. The decoupled signals are suitable for loudspeaker reproduction. The decoupled signals can be further applied to a second decoupling network which can be adjusted to produce headphone stereophonic signals matched to a listener's individual directional hearing pattern.