Alpine MRV-M1200 Monoblock 1200 Watts RMS Class D Amplifier Amplifier Type: Class-D (Digital) | Channel Design: 1 Channel (Mono) | Power Supply Design: DC-DC PWM | Power Supply: MOSFET | Pre-Amp Stage: Discrete | Final Outputs: Power MOSFET | Crossover: Variable Lowpass Filter. Gain Control: Continuously Adjustable Gain Control | Remote Turn On: Remote Sensing Function (for Speaker Level Input) | Current Protection: Over-Current, Over-Voltage, Under-Voltage and Thermal Protection | Board Circuitry: S.T.A.R. Circuit | RCA Output: Non-Fading Pre-Amp Output (4 Volts). Speaker-Level Inputs: 4-channel Speaker Level Inputs | Power Indicator: Top Mounted Blue LED Power Indicator | Thermal Control: Multi-stage Power Limits | Power Requirements: 14. DC (11-16V allowable) | Input Sensitivity (RCA Input): 0. 15 – 40 V | Input Sensitivity (Speaker Level Input): 0. 4 – 10 V | Input Impedance:>10k ohms. Frequency Response (+0, -3dB: 1W into 4 Ohms) for Subwoofer: 7 -400 Hz | Damping Factor (10W into 4 Ohms at 100Hz):>750 | Signal to Noise (1W into 4 Ohms):>85 dB | Signal to Noise (Rated Power into 4 Ohms):>105 dB | Preamp Output: 40V Max. | Remote Level: -20 to 0 dB. RMS Power Ratings: Per channel into 4 Ohms: 600W RMS x 1 (14.