The K1200.4 is a Korean manufactured, Class D, 4 channel amplifier. We pulled no punches when it comes to quality signal, power output, and reliability. With a stellar crossover network, integrated cooling fan, and top of the line components, you can trust the K1200.4 to bring your speakers to life! Power ratings 190w x4 @ 4 ohm 300w x4 @ 2 ohm 570w x2 bridged @ 4 ohm (All ratings dyno certified at 12.6v) Frequency Response: 20Hz - 8KHz High Pass Filter: 20Hz - 8kHz Low Pass Filter: 50Hz - 8kHz Signal to Noise Ratio: 95dB < Fuse Rating: 120 Operating Voltage: 9 to 16 Volts Length 10.875” overall (heatsink 9.9”) Width 4.7” Height 2.2