How are three active speakers connected?

1. First, connect three stereos (stereo A, stereo B and stereo C) to one channel, taking the left channel as an example. Insert the left channel line of audio A into the output port of the sound card; Insert the left channel line of stereo B into the RCA output interface of stereo A (or different input ports of the same computer); Plug the left channel line of stereo C into the RCA output interface of stereo B.

2. Secondly, connect the right channel wires of the three stereos together in the same way and connect them to the right channel output port of the computer.

3. Finally, in this way, the three stereos are connected in series through RCA line to output the left channel signal of the computer.