MTX 180W 2 Channels Bridgeable Road Thunder Amplifier Features: Selectable Full Range, Low Pass, or High Pass setting allows for use in diverse installation scenarios. Speaker level and RCA inputs for install flexibility. Amplifier Class: Class AB RMS Power: 60W x 2 @ 4 ohms 90W x 2 @ 2 ohms Bridged Power: 180W x 1 @ 4 ohms Frequency Response: 20Hz - 30KHz THD: SNR: 80 dB Input Voltage: 100mV - 6V