BOSS Audio NXD5500 Onyx 5500-watts Monoblock Class D 1 Channel 1 Ohm Stable Amplifier with Remote Subwoofer Level Control Amplifier Class: Class D Technology: Digital Number of Output Channels: 1 Total Power: 5500 Watts Max Power @ 1 Ohm: 5500 Watts x 1 Max Power @ 2 Ohms: 4000 Watts x 1 Max Power @ 2 Ohms, when strapped with same model amplifier: 11000 Watts RMS Power @ 4 Ohms: 2300 Watts x 1 Frequency Response: 15 to 150 Hz Total Harmonic Distortion (THD) @ RMS Output: 0.01% Signal-to-Noise Ratio (SNR): 105 dB Minimum Speaker Impedance: 1 Ohms Variable Low Pass Crossover: 45 to 150 Hz Dimensions: 2.25"" x 18"" x 10"" Soft Turn-On Circuit Master/Slave Switch Thermal Overload & Speaker's Short Protection Remote Subwoofer Level Control Power & Protection LEDs Number of RCA Line Output: 2 Strapping Capability Input Sensitivity Selector Monoblock Onyx amplifier with Class D power supply Delivers 5500 Watts at 2 ohms; 4000 Watts at 4 ohms Low level inputs with variable gain control Low-pass variable crossover; subsonic filter; 18dB bass boost Line outs for system building; includes remote sub control