Patent ID: 8050424

Claim:
An audio system comprising: a plurality of speakers, each speaker of said plurality of speakers including a cabinet having a resonance frequency in a low band range and a speaker unit housed in said cabinet, wherein the resonance frequency is differentiated between said cabinets of individual ones of said plurality of speakers; and an audio amplifier for inputting and amplifying audio signals of a plurality of channels to output amplified audio signals, the audio amplifier including: a signal separation section that separates the audio signal of each of the plurality of channels into a low-frequency signal relative to a crossover frequency between high-pass filters and low-pass filters and a high-frequency signal relative to the crossover frequency between the high-pass filters and low-pass filters and adds together the low-frequency signals of individual ones of the plurality of channels; a phase shift section that shifts respective phases of the low-frequency signals of the plurality of channels, separated by said signal separation section, with a characteristic differing between the plurality of channels; an addition section that, for each of the plurality of channels, adds together the low-frequency signal phase-shifted by said phase shift section and the high-frequency signal of the channel separated by said signal separation section, to thereby provide an added signal for the channel; and an amplification section coupled to each speaker of the plurality of speakers that amplifies the added signal provided by the addition section for each of the plurality of channels and supplies an amplified added signal to the corresponding speaker of the plurality of speakers, wherein, for each of the plurality of channels, the phase shift section shifts the low-frequency signal with a characteristic corresponding to a combination of phase characteristics of the cabinets of the speakers connected to individual ones of the channels other than said channel.