Provided is a digital acoustic system comprising: a DeltaSigma modulator that modulates a digital input signal and outputs a digital signal; a post-filter that is connected to the DeltaSigma modulator and which performs mismatch shaping to convert the digital signal; a parallel-serial converter that converts the digital signal converted by the post-filter into a digital signal which is serially transmitted; a serial-parallel converter that restores the digital signal converted by the parallel-serial converter; and a drive circuit which receives the digital signal restored by the serial-parallel converter, and drives drive elements to convert the signal into an analog audio signal.