The USB flash drive is only a data storage device and does not have a playback function, that is, it cannot be directly connected to the amplifier for playback.

1. If the power amplifier device has the function of supporting U disk playback, you can insert the U disk into its USB interface and it will automatically play;

2. The power amplifier does not have this function. , the audio signal can only be output through the mp3 decoding device that supports the U disk function and sent to the power amplifier;

3. Make a change and copy the U disk music files into the MP3 player. Then connect the MP3 headphone output interface to the power amplifier with a signal cable, and the MP3 can control the music playback.