5,000 x 1 @ 1 ohm RMS 4,950 x 1 @ 2 ohms RMS 3,400 x 1 @ 4 ohms RMS Variable 12d - B low pass filter: 40Hz-20k - Hz Variable 12d - B high pass filter: 10Hz-1k - Hz Variable 12d - B Bass Boost @ 50Hz Power, protection & clipping indicators included Thermal, voltage, speaker short ...5,000 x 1 @ 1 ohm RMS 4,950 x 1 @ 2 ohms RMS 3,400 x 1 @ 4 ohms RMS Variable 12d - B low pass filter: 40Hz-20k - Hz Variable 12d - B high pass filter: 10Hz-1k - Hz Variable 12d - B Bass Boost @ 50Hz Power, protection & clipping indicators included Thermal, voltage, speaker short, and dc-offset protection circuitry Advanced 3-speed fan design Subsonic filter Intelligent full bridge design Wired remote control with clipping indicator included Delivering tremendous power at 1, 2, or 4 ohms, the Sundown SIA amps are built with power and stability at their core. These full-bridge amplifiers feature a heavy heatsink for outstanding thermal management, while the three-speed Smart Cooling fan and advanced power supply design protects the amplifier from overheating and distorted output. Made to bang all day long, by the world champions of bass! Product Manual Specifications Input Sensitivity: 5V Max Single Noise Ratio: 108d - B Working Voltage: 10.5V – 15.5V DC Recommended Fuse Rating: 220A x 2 Dimensions (HxWxL): 2.68” x 8.86” x 13.78”