Behringer KM3600Q; 4-channel amplifier with ATR (Accelerated Transient Response) technology; 4x 810 watts at 4 ohms (4x 490 watts at 8 ohms, bridge mode: 2x 1800 watts at 4 ohms, 2x 1600 watts at 8 ohms); Zero-attack limiter; signal and clip LED, 4x XLR input, 4x speaker twist output, 2U rack height