The key to a reference-quality headunit should be simple: it has to reproduce the original source material authentically and naturally. In addition, it must provide powerful digital tools to allow the installer to setup and tune the system. Pioneer has a long heritage of award-winning sound quality headunits, starting almost 2 decades ago with the ODR (Optical Digital Reference) system. The DEX-P99RS is the grandchild of that system, featuring complex technologies and utmost sound purity that shatter your expectations. It truly must be "heard" to be believed.