The SX Amps are built around a new power core design with over-sized toroidal transformers and extra-large heat sinks. The amps maintain cool operating temperatures thanks to an innovative forced-air cooling system with temperature sensitive variable-speed fans. Trouble free operation is provided by multi-stage protection for power-up, over-heating, over-current, short circuit, low output impedance and DC voltage, assuring total reliability under the most demanding conditions. The entire SX line features locking XLR/TRS inputs, Speakon® and 5-way binding post speaker outputs.