To improve the sound quality of the speaker unit in a multi-way system.

This audio signal processor is constituted of an A/D converter 1, a convolver 2, plural low-pass filters 13a-1,..., plural high-pass filters 13b-1,..., plural parametric equalizers 4-1,..., a control circuit 18 and a memory circuit 19, etc., and is used by being connected to the speaker unit SP provided with respective speakers SP1, SP2, SP3 and SP4 for high-frequency sound, middle- frequency sound, low-frequency sound and lowest-frequency sound. A correction coefficient and a set value to be supplied to the convolver 2 and the respective filters corresponding to many speaker units already on the market are prepared in the memory circuit as data experimentally obtained beforehand. At the time of use, by inputting the kind of the speaker unit to be applied by an operation part beforehand, the coefficient corresponding to a machine kind is supplied to respective constituting parts and ideal sound corresponding to the unit is emitted.