An acoustic characteristic adjustment device (1) whose acoustic characteristics can be adjusted freely by a listener. The device (1) comprises signal processing units (Al-Ap) for performing signal processing on audio signals (X1-Xp) and outputting the resultant to speakers of respective channels. The signal processing units are composed of high frequency convolution arithmetic sections (B1-Bp), low frequency convolution arithmetic sections (C1-Cp), and delay sections (D1-Dp,E1-Ep). The acoustic characteristic adjustment device (1) further comprises: an operation section (30) from which the listener or the like inputs a target characteristic in order to adjust a desired acoustic characteristic; an impulse characteristic control section (21); and a delay time control section (22). Based on the target characteristic, the impulse characteristic control section (21) calculates impulse response data (hlm-hpm, hln-hpn) to make the arithmetic sections (B1-Bp, C1-Cp)) perform respective convolution arithmetics. The delay time control section calculates alignment delay times necessary for sounds emitted from the speakers to reach a listening position or the like, respectively. The delay time control section also calculates correction times for compensating respective deviations in phase between output signals (X11-Xp1) in a high frequency band, which are output from the high frequency convolution arithmetic sections (B1-Bp) as a result of convolution arithmetics, and output signal (X12-Xp2) in a low frequency band, which are output from the low frequency convolution arithmetic sections. Times obtained by correcting the alignment delay times with the correction times are set as the delay times of the delay sections (D1-Dp, E1-Ep), respectively.