BEHRINGER iNUKE NU4-6000 Delivers 4 x 1500 Watts into 2 Ohms, 2 x 3000 Watts into 4 Ohms and weighs less than 12 lbs / 5.5 kg Ultimate reliability through revolutionary cool-running High-Density Class-D technology with "near-zero" thermal buildup Ultra-efficient switch-mode power supply for noise-free audio, superior transient response and low power consumption "Zero-Attack" limiters offer maximum output level with reliable overload protection Built-in Subwoofer/Satellite crossover for perfect subwoofer operation