One channel power amplifier is Class-D series. The output power of this series amplifier is 500W. The amplifiers are designed to be both tabletop and rack mount in 1U height. A shinning feature of this amplifier is that power electricity saving technology has been adopted. From one hand, switch power technology with APFC (Active power factor correction) had enhanced the efficiency up to 85%. From another hand, this amplifier is also preferable for much lower heat generation of less than 55? even at severe working conditions, thus this benefits are not only good for a green environment but also good for extension of life span. A line input by phoenix connectors. A RJ45 port for remote power control, volume control and status monitor. Remote power on/off could be done through the RJ45 port. The speaker output of 100V line without transformer. Volume control is supplied. The status indicators include signal, peak and protection. 190 to 240V AC wide voltage input suitable for global distribution. The 24V DC input for higher reliability, which is also designed of wide range protection within 20V to 25.6V, so as to protect battery during power shortage and protect circuit from high voltage damage. The cooling system to ensure the system internal temp kept under 55?. Extensive protection includes high temp, overload and short-circuit.