Behringer EUROPOWER EP4000 Professional 4, 000-Watt Stereo Power Amplifier with ATR (Accelerated Transient Response) Technology 2 x 2, 000 Watts into 2 Ohms; 2 x 1, 400 Watts into 4 Ohms; 4, 000 Watts into 4 Ohms (bridge mode) ATR (Accelerated Transient Response) technology for ultimate punch and clarity Switchable limiters offer maximum output level with reliable overload protection Detented gain controls for precise setting and matching of sensitivity Precise Power, Signal and Clip LEDs to monitor performance XLR and 1/4" TRS input connectors for compatibility with any source Professional speaker connectors and "touch-proof" binding posts support most speaker wiring systems Selectable low-frequency filters remove damaging infra-sound frequencies Independent DC and thermal overload protection on each channel automatically protects amplifier and speakers High-current toroidal transformer for ultra-high transient response and absolute reliability "Back-to-front" ventilation system including air filter for reliable operation "Built-like-a-tank, " impact-resistant, all-steel 2U rackmount chassis 3-Year Warranty Program* Designed and engineered in Germany