Use 3.5 mm stereo double lotus audio cable, from the speaker Out output end of the computer sound card to the audio access end of the power amplifier. Just connect two main speakers to the main speaker inputs of the power amplifier.
Computer sound cards now generally have an output capacity of 5. 1 channel. The specific connection method is as follows:
First of all, you need 5. 1 speakers, which can be a full set of satellite boxes (subwoofer with power amplifier +5 small speakers) or a home theater (5. 1 amplifier +2 main speakers+center +2 surround speakers+1 subwoofer with the only sound source).
In the sound card setup tool, set it to 5. 1 output mode. Connect the main channel, surround sound channel and center+subwoofer channel to the 5. 1 input of the power amplifier with three 3.5mm stereo-to-double lotus audio cables.
When playing a DVD, set the audio output to 5. 1 mode in the playback software (such as PowerDVD).
Then, enjoy the shocking effect of 5. 1 sound effect, no less than home theater.