1. First prepare an RCA coaxial cable to connect the power amplifier and speakers.
2. Next, connect the power amplifier and the speaker. Plug one end of the RCA coaxial cable into the RCA interface of the power amplifier and the other end into the RCA interface of the speaker.
3. Then adjust the input mode of the speaker to digital input.
4. Then connect the digital audio cable, insert one end of the digital audio cable into the digital audio output interface of the power amplifier, and the other end into the digital audio input interface of the speaker.
5. After the connection is completed, turn on the power amplifier and speakers, and you can use digital audio signals to play music.