Patent ID: 6937733

Claim:
An audio system, comprising: a volume control means for adjusting the volume of output signals of a tuner or deck; a plurality of equalizers compensating for frequency characteristics of output signals of the volume control means; a power amplifier amplifying the power of output signals of the plurality of the equalizers to transmit to speakers; and a phase adjusting means for dividing at least one or more sets of the audio signals into a plurality of frequency bands when said audio signals are inputted from said volume control means to the plurality of the equalizers, and for adjusting the phase of at least one or more sets of said audio signals among the divided audio signals, wherein the phase adjusting means comprises: low pass filters removing audio signals of frequency bands higher than a reference frequency from the output audio signals of said volume control means; high pass filters removing audio signals of frequency bands lower than the reference frequency from the output audio signals of said volume control means; and summing circuits adding together output audio signals of the low pass filters and the high pass filters.