A speaker array apparatus comprising: a signal divider adapted to divide an input audio signal (Sin) into a first signal component of a first predetermined frequency range to generate first divided audio signals (SH, SH-1, SH-2) and into a second signal component of a second predetermined frequency range to generate a second divided audio signal; a first speaker unit adapted to emit sound based on one divided audio signal (Sb) among the first divided audio signals; a second speaker unit adapted to emit sound based on one divided audio signal (Sa) among the first and second divided audio signals; characterized by: an amplitude adjuster having: a first gain amplifier adapted to amplify one (SH, SH-2) of the generated first divided audio signals and then output the amplified one of the first divided audio signals (Sb) to the first speaker unit, but not to the second speaker unit; a second gain amplifier adapted to amplify another (SH, SH-1) of the generated first divided audio signals and then output the amplified another of the first divided audio signals (Sga') to the second speaker unit, and a third gain amplifier adapted to amplify the generated second divided audio signal and then output the amplified second divided audio signal (Sga) to the second speaker unit; wherein the first speaker unit comprises a plurality of speakers (221-1 to 221-25) and the second speaker unit comprises a plurality of speakers (211-1 to 211-12), and the speakers (211-1 to 211-12) of the second speaker unit are larger in diameter than speakers (221-1 to 221-25) of the first speaker unit. a signal divider adapted to divide an input audio signal (Sin) into a first signal component of a first predetermined frequency range to generate first divided audio signals (SH, SH-1, SH-2) and into a second signal component of a second predetermined frequency range to generate a second divided audio signal; a first speaker unit adapted to emit sound based on one divided audio signal (Sb) among the first divided audio signals; a second speaker unit adapted to emit sound based on one divided audio signal (Sa) among the first and second divided audio signals; characterized by: an amplitude adjuster having: a first gain amplifier adapted to amplify one (SH, SH-2) of the generated first divided audio signals and then output the amplified one of the first divided audio signals (Sb) to the first speaker unit, but not to the second speaker unit; a second gain amplifier adapted to amplify another (SH, SH-1) of the generated first divided audio signals and then output the amplified another of the first divided audio signals (Sga') to the second speaker unit, and a third gain amplifier adapted to amplify the generated second divided audio signal and then output the amplified second divided audio signal (Sga) to the second speaker unit; wherein the first speaker unit comprises a plurality of speakers (221-1 to 221-25) and the second speaker unit comprises a plurality of speakers (211-1 to 211-12), and the speakers (211-1 to 211-12) of the second speaker unit are larger in diameter than speakers (221-1 to 221-25) of the first speaker unit. an amplitude adjuster having: a first gain amplifier adapted to amplify one (SH, SH-2) of the generated first divided audio signals and then output the amplified one of the first divided audio signals (Sb) to the first speaker unit, but not to the second speaker unit; a second gain amplifier adapted to amplify another (SH, SH-1) of the generated first divided audio signals and then output the amplified another of the first divided audio signals (Sga') to the second speaker unit, and a third gain amplifier adapted to amplify the generated second divided audio signal and then output the amplified second divided audio signal (Sga) to the second speaker unit; wherein the first speaker unit comprises a plurality of speakers (221-1 to 221-25) and the second speaker unit comprises a plurality of speakers (211-1 to 211-12), and the speakers (211-1 to 211-12) of the second speaker unit are larger in diameter than speakers (221-1 to 221-25) of the first speaker unit. a first gain amplifier adapted to amplify one (SH, SH-2) of the generated first divided audio signals and then output the amplified one of the first divided audio signals (Sb) to the first speaker unit, but not to the second speaker unit; a second gain amplifier adapted to amplify another (SH, SH-1) of the generated first divided audio signals and then output the amplified another of the first divided audio signals (Sga') to the second speaker unit, and a third gain amplifier adapted to amplify the generated second divided audio signal and then output the amplified second divided audio signal (Sga) to the second speaker unit; wherein the first speaker unit comprises a plurality of speakers (221-1 to 221-25) and the second speaker unit comprises a plurality of speakers (211-1 to 211-12), and the speakers (211-1 to 211-12) of the second speaker unit are larger in diameter than speakers (221-1 to 221-25) of the first speaker unit.