You have to get an external sound card! First of all, you need to know the function of each device: the notebook is used to play the sound source, and the playback software is installed in it, and the equalizer is turned on for tuning. 5 yuan bought a 3.5 stereo plug for RCA showerhead dual-channel audio cable. The output of that earphone jack of the notebook compute is connected to the input end of the pow amplifier, ...