The BXX1200.4 is a 1200 watt 4 channel amplifier featuring Super A/B Class technology to provide the perfect sound quality design. The T3 (twin turbo toroid) power supply torroids in a Pulse Width Modulated MOSFET power supply assures the car voltage is maximized from battery to Ultra-Fi output devices. The rock solid Ultra-Fi MOSFET outputs, selected for both balance and output power, keep the power smooth even during demanding peak in the music.. Low Noise Pre-Amplifier Circuitry. Maximum low voltage signal from the source unit comes into the amplifier circuit with minimal distortion. RCA Inputs. Nickel-plated RCA jacks create the most efficient audio connection and resist corrosion. Operation Mode . 4 channel operation mode allows either stereo or mono bridged operation. Crossover Type . Variable electronic crossovers allow for complete control of the sound. Electronic Equalizer. Control of amplifier output with on-board electronic crossover to tailor specific frequencies to speakers and subwoofers. Class / Topology. Super A/B Class proprietary designs use high-speed microprocessors with proprietary D/A conversion algorithms to efficiently control the current consumption. At very high listening levels, this unique hybrid of Super A/B Technology results in lower distortion, higher current efficiencies and less heat than conventional amplifier designs. Output Device Technology. Pro-Fi Output Device Technology. The Ultra-Fi MOSFET is designed for music production vs just electronics output power. It produces very musical high power with high efficiency for cooling and minimal distortion. Heat Sink. Classic aluminum Hifonics design to minimize heat build up on the Ultra-Fi output devices. Power Supply. Simpatico coil design.