Rockford Fosgate Prime R300-4 300-Watt Multi-Channel Amplifier Four-channel amplifier delivers 75 watts at 2 ohms, 50 watts at 4 ohms, 150 watts at 4 ohms bridged mono Selectable high-pass crossover at 80Hz or variable low pass crossover at 50Hz-250Hz, both with 12dB/octave slope Punch Bass adjustable bass level control of 0dB/+6dB/+12dB centered at 45Hz RCA inputs for signal level input and pass-through jacks for system building The input gain control is preset to match the output of most source units