Power amplifier connected to sound card

The sound card is connected to the power amplifier, and you can do it yourself, but the cost is relatively high. 1Buy one in 0 yuan. Half line. One end is 3.5mm (like an ordinary mp3 headphone jack), and the other end is red and white.

The power amplifier is connected with audio, and the colors at both ends are the same, regardless of positive or negative.