An audio signal output device includes an audio signal acquisition unit configured to acquire audio signals of a plurality of channels, a first electronic controller, and an output unit. The first electronic controller includes a quantization bit expansion unit configured to expand the number of quantization bits of each of the audio signals to generate an expansion region for each of the audio signals, and an audio signal processing unit configured to generate an output signal in which the plurality of channels are downmixed such that an audio signal of at least one channel from among the plurality of channels is arranged at a reference bit position different from a reference bit position for an audio signal of a different channel of the plurality of channels, by using the expansion region. The output unit is configured to output the output signal.