Many stereos have a line in/out connection port.
If you are looking to connect two audio devices together, you usually do so through a connection cable and the line in/out ports. These ports are a single circular opening in the device (as to the two used by RCA cables). You can find this particular port on most laptop computers and stereo systems. Depending on what you are looking to connect, headphones and microphones typically plug into the line in/out ports.
Instructions
1. Plug one of the ends of the 3.5mm cable into the "Line Out" port of the device you want to send the audio from. If you are using a computer microphone the cable is already built into the bottom of the hardware.
2. Connect the other end of the 3.5mm cable into the "Line In" port on the device you want to import the audio into.
3. Power on both pieces of hardware, then set the device you want to play the audio with to "Aux." This is the auxiliary setting and it plays all content brought in through the "Line In" port.
Tags: device want, Line port, cable into, cable into Line, into Line