1. Auto volume regulator has two AUDIO IN jacks: red and white, which are connected via audio wires with AUDIO OUT jack on the player that needs balancing sources (such as STB, DVD, background music amplifier or computer) .
2. Red and white AUDIO OUT jacks on auto volume regulator are connected via audio wires with red and white AUDIO IN jacks on TV or amplifier.
3. Plug in the power adaptor, and keep maximizing the audio output of STB, computer, DVD and karaoke player without any distortion; only adjust VOLUME on TV, amplifier or volume regulator to adjust the actual volume