The XDI 804 80W X 4 Class D Amp is a compact amplifier that has been designed for small vehicles and/or motorcycle applications. The XDI 804 80W X 4 Class D Amp employs Full range Class D Design that significantly improves efficiency without compromise to the sound quality. The High Frequency switching power supply allows for greater separation from audible listening frequencies increasing sound quality and lowering THD while the Input Inductor power supply isolation protects from unwanted interference in AM/FM reception. The Ultra Low ESR high capacity power supply storage bank covers potential fluctuations in power supply demand, increasing efficiency and sound quality. The XDI 804 80W X 4 Class D Amp is based on Phillips chip based Class D Technology and produces little or no heat. The embedded protection circuits include Thermal, Current Limit, Rollback DC Offset, Reverse Polarity and Overvoltage.