The Paradigm X-300 is an Ultra-Class D power amplifier designed to configure amp for specific applications. It has a number of control facilities, including: auto on/off, subwoofer level, subwoofer cut-off frequency with bypass option, and sub/sat phase alignment (continuously variable 0o to 180o). It also comes with a number of input facilities, such as single ended RCA inputs, sub-in right (mono) input, and a USB port/PBK interface.