... AA1600/2200/3500 are specially designed hi-power amplifier used for touring and installation. CLASS H circuit to improve the ... in operation;Comprehensive protection, e.g. short-circuit protection, Thermal protection, DC protection;Cooling fan with variable speed;Built-in ... over input;30Hz hi-pass filter, ground lift switch;Stereo/mono/bridge selector, switch for -3dB,0dB,+3dB.Stadium, disco, large show, ...