Features Specifications:Sell Pa Amplifier, switching power amplifier, professional amplifier  High power professional amplifier, switching power amplifier, pro audio sound system, professional sound audio equipment, pa audio system. Introduction * Applying switch mode technologyin TP provides light weight, hight effeciency, high power output but low power consumption. More safe, stable, durable than analog power amplifiers. * Distinct low heat dissipation. Intelligent cooling fan for A and B channel adjusts its cooling speed automatically following the heat-sink temperature. Cooling fans work slow below 50 but faster at over 50, which guarantees a minimization of heat dissipation. * Adjustable gain controller (Load Matching switch at -0, -2, -4, -5dB) enables user flexibly to optimize the sonic solution ( easy matching between speakers and amplifiers).  * Three Input Sensitivity Selectors (41dB, 32dB, 26dB) available, which enables users choose suitable sound source for loudspeaker. * Thermal protection system equipped in different locations. Channel A or B can be shut up separately while heat-sink in either channel is over 90. Both Channel A & B can be shut off when heat sink at power supply reaches 90.  * Short circuit protection, RF protection, DC-fault protection. Delivering excellent sound quality, specially in LF output comparing to other ordinary switching power amps.