BOSS Audio PH2500M Phantom 2500-watts Monoblock Class A/B 1 Channel 2-8 Ohm Stable Amplifier with Remote Subwoofer Level Control (Discontinued by Manufacturer) Amplifier Class: Class A/B Technology: MOSFET Number of Output Channels: 1 Total Power: 2500 Watts Max Power @ 2 Ohms: 2500 Watts x 1 RMS Power @ 4 Ohms: 580 Watts x 1 Frequency Response: 9 to 50000 Hz Total Harmonic Distortion (THD) @ RMS Output: 0.01% Signal-to-Noise Ratio (SNR): 103 dB Minimum Speaker Impedance: 2 Ohms Variable Low Pass Crossover: 45 to 90 Hz Dimensions: 2.25"" x 14"" x 9.5"" Soft Turn-On Circuit Thermal Overload & Speaker's Short Protection Remote Subwoofer Level Control Power & Protection LEDs Input Sensitivity Selector Monoblock Phantom amplifier with MOSFET power supply Delivers 2500 Watts at 2 ohms; 1400 Watts at 4 ohms Line and speaker level inputs with variable gain control Low-pass variable crossover; 18dB bass boost Includes remote sub control