DS18 EXL Series EXL-A3K1 3,000 Watts Max 1-Channel Monoblock Class D Digital Extremely Loud Series 3,000 Watts Max Power 1-Channel monoblock Amplifier with MOSFET PSU transistors. Made with extruded aluminum chassis with black, glossy, and polished heat sink. RMS POWER @ 4-OHMS 1 X 250W, RMS POWER @ 2-OHMS 1 X 350W. RMS POWER @ 1-OHM 1 X 600W. RMS POWER @ 4-OHMS BRIDGED N/A Variable Low Pass: 30Hz-250Hz. Subsonic Frequency: 20Hz-50Hz. Bass Boost: 0-18dB THD%: &lt;0.1%. Signal to Noise Ratio: &gt;90dB. Frequency Response: 20Hz-250Hz. Speaker Impedance: 1-16Ohms. Input Sensitivity: 8V-0.2V Dimensions: 9.76x8.4x2.14"