MB Quart Discus DSC450 200 Watt A/B Class 4-Channel Amplifier 4 x 50 W @ 4 Ohms, 4 x 100 W @ 2 Ohms, 2 x 200 W @ 4 Ohms System stability with oversized Pulse Width Modulation (PWM) digital power supplies and high-speed MOSFET Ultra-flexible and variable adjustable active crossover network; Tandem-core toroidals for extreme ruggedness and high-grade electrical components