Behringer EPQ304 Professional 300-Watt Light Weight 4-Channel Power Amplifier with ATR (Accelerated Transient Response) Technology. 4 x 75 Watts into 4 Ohms; 4 x 50 Watts into 8 Ohms. ATR (Accelerated Transient Response) technology for ultimate punch and clarity. Ultra-light, ultra-low noise and ultra-efficient switch-mode power supply for noise-free audio, superior transient response and low power consumption. Independent limiters for each channel 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. Servo-balanced XLR and 1/4'' TRS inputs plus professional speaker connectors. Independent DC and thermal overload protection on each channel automatically protects amplifier and speakers without shutting down the show. “Back-to-frontâ€