Alpine MRP-F300 4-Channel 300 Watts Amplifier 50 watts RMS x 4 at 4 ohms (75 watts RMS x 4 at 2 ohms) 150 watts RMS x 2 bridged output at 4 ohms (4-ohm stable in bridged mode) Crossover: 50Hz-400Hz, -12dB/oct. (Low-Pass/High-Pass); EQ (Equalizer): Bass EQ (Fixed Frequency): 50Hz +12dB; Subsonic Filter: 15Hz (Fixed), -18dB/oct. Amplifier Type: Class-A/B