Dolby Pro Logic II is a matrix sound decoding technology developed by Dolby Laboratories that decodes any twochannel audio source, such as a CD or radio broadcast, and outputs it as 5.1- channel sound. Clarion was the first to incorporate this innovation, which brings the sonic experience of a live concert right into the car. And since it’s equipped with a Center-Width Control and a Matrix Mode that simulates the center-channel speaker using the front L/R speakers, you can reproduce a quasi 5.1-channel surround sound effect from a standard fourspeaker setup. Users also have additional modes to choose from, all of which were created to enhance the listening experience of your vehicle.