Abstract: There is provided an audio data processing device. The device includes an IN terminal to which first audio data from outside are input, a THRU terminal from which the first audio data are output to the outside, an FPGA which signal-processes the first audio data from the IN terminal, an OUT terminal from which second audio data which are signal-processed are output to the outside, and a power supply switch. The FPGA outputs the first audio data from the IN terminal to the THRU terminal without any processing when the power supply switch is in an ON state and is also supplied with operational power and outputs the first audio data from the IN terminal to the THRU terminal without any processing when the power supply switch is in an OFF state.

Abstract: There is provided an audio data processing device. The device includes an IN terminal to which first audio data from outside are input, a THRU terminal from which the first audio data are output to the outside, an FPGA which signal-processes the first audio data from the IN terminal, an OUT terminal from which second audio data which are signal-processed are output to the outside, and a power supply switch. The FPGA outputs the first audio data from the IN terminal to the THRU terminal without any processing when the power supply switch is in an ON state and is also supplied with operational power and outputs the first audio data from the IN terminal to the THRU terminal without any processing when the power supply switch is in an OFF state.

Abstract: An instrument amplifier includes an amplifier circuit for amplifying a sound signal input from an electric guitar. A main speaker emits sound according to the sound signal being amplified. A CD player plays back an audio signal from an audio CD. Side speakers for playback emits audio sound according to the audio signal being played back. A speaker box contains the main speaker and the side speakers in one space. In one embodiment, the speaker box includes a rear panel for closing a space behind the main speaker and the side speakers. Furthermore, an output mode key is settable in a first mode by external operation, the first mode being for controlling the playback speaker to emit sound according to the sound signal. The side speakers are disposed beside one another, for stereo sound emission of the audio sound.