The real stand-out feature of the SX line of amplifiers is the 32-bit digital signal processing. Sure, digital control over amp features is nice, but Kicker has thought long and hard about what the digital system will control and how it will control it. The interface to the digital system is a five-button keypad and blue-on-black LED display called ISIS (pronounced Eye-Sis). This stands for Indicate Status and Input Settings. From the ISIS control you can choose from one of the following menus: System, Gain, EQ, Low-pass, High-Pass, Phase, Mute, Kompressor and Security. The list of sub-menus is quite extensive, but easy to comprehend.