<p>There is disclosed an audio system including a speaker group for outputting acoustic signals obtained through a plurality of acoustic signal channels into the same space to form a sound field. The audio system includes: two feature-variable equalizers connected longitudinally and constituting a part of the acoustic signal channel; a sound field feature detection unit for supplying a test signal via the acoustic signal channel to detect a sound pressure in the sound field and obtain a sound pressure signal; and a feature adjustment unit for adjusting the equalizer feature of each of the feature-variable equalizers according to the sound pressure signal for each of the acoustic signal channels. The sound field feature detection unit selectively generates a test signal of different band while the feature adjustment unit adjusts the equalizer feature of one of the two feature-variable equalizers according to the band of the test signal.</p>
