An audio playing system is provided comprising a first processing module, a second processing module, a control module, an output module, and a displaying module. The first and second processing modules amplify an audio signal and respectively generates a first first processed signal, a first second processed signal, a second first processed signal, and a second second processed signal. The control module is coupled to the first processing module and the second processing module and generates a playing signal according to a control signal, the first first processed signal, the first second processed signal, the second first processed signal, and the second second processed signal. The output module is coupled to the control module and amplifies the playing signal to generate an output signal. The displaying module is coupled to the output module and plays the output signal.