Many iPhone owners are not aware they can listen to songs stored on their iPhone over their PC speakers. The most straightforward way to listen to the iPhone over external PC speakers is simply to plug the speaker jack into the earphone jack of the iPhone. The iPhone earphone jack supports the same size adapter as the speaker jack. However, you can also use the “Line In” jack on your computer and play music files on your iPhone through the speakers connected to your PC. Writer Bio

How to Play iPhone Tunes Through PC Speakers  7 Steps  - 68