SIA-1250D | Sundown Audio Smart 1250W RMS Monoblock Car Audio Amplifier The Sundown Audio SIA-1250D Smart Amplifier delivers powerful full-range performance in a compact and efficient Class-D design. Engineered for serious daily audio systems, the SIA-1250D provides strong output, intelligent cooling, and reliable 1-ohm stability for demanding subwoofer applications. Product Features: 1250W RMS Monoblock Class-D Car Audio Amplifier 1 Ohm Stable Full-Range Smart Amplifier Design Smart Cooling Fan System with 3-Speed Thermal Control Wired Remote Bass Level Control with Clipping Indicator Heavy Duty Aluminum Heatsink for Improved Cooling Dual MOSFET PWM Power Supply Compact Footprint for Easier Installation Output Short, Thermal, DC Offset, and Voltage Protection Power Output: 1250 Watts RMS x 1 @ 1 Ohm 1250 Watts RMS x 1 @ 2 Ohm 800 Watts RMS x 1 @ 4 Ohm Specifications: Frequency Response: 10Hz – 20kHz Signal-to-Noise Ratio: 108dB Input Sensitivity: 200mV Recommended Fuse Rating: 120A Minimum Operating Voltage: 9V DC Maximum Operating Voltage: 16V DC 0 Gauge Power & Ground Inputs 8 Gauge Speaker Outputs Crossover Controls: Variable High Pass Filter: 10Hz – 1kHz Variable Low Pass Filter: 40Hz – 20kHz Dimensions: 7.28" x 5.71" x 2.44"