Arc Audio X2 450.4 Multi-channel amplifier (4-channels) Multi-channel amplifier (4-channels) Microprocessor Class-D Design Designed And Engineered By Robert Zeff High-Frequency Power Supply Design For Improved Signal Transparency And Overall Sound Quality) Level 1 X2 Cosmetics Package - Texture Coated Stamped Steel Cosmetic Cover With Aluminum Logo Badge. (Changeable to Level-2 XDi Cosmetics) Single Side Connection Design Full-Range Design Nickel Plated RCA Terminals Quick Disconnect Speaker Terminal Plugs Audiophile Class-D Output Filter Networks Detailed Micro Processor Controlled Protection Large, High-Frequency Switching Power Supplies RCA Inputs Are Compatible With Speaker Level Inputs Fault Codes Storage Of The Last Protection Code Detected Hi Signal To Noise Ratio Without Compromising Power Output Fully Balanced Input Stage Significantly Increases Flexibility Ultra-Low ESR, High-capacity Power Supply Storage Capacitors Flexible Mounting Orientation For Vertical Or Horizontal Installations Next Generation High-Speed Class-D Technology Powering All XDi Amplifiers Bridged Mode Auto Detect Turn-On Works With Most Chip Based OEM Head Units Precision Filtering Isolates The Power Supply Reducing Unwanted Interference In Radio Reception Block Type Terminal Connections Specifications - 4- Channels @ 4 Ohms - 85 Watts 4-Channels @ 2 Ohms - 125 Watts 2-Channel @ 4 Ohms (Bridged) - 250 Watts 2-Channel @ 2-Ohms (Bridge) - Not Recommended Frequency Response - 20Hz - 20kHz Crossover Range (Front) - 50Hz - 3kHz Crossover Range (Rear) - HP 10Hz - 1kHz / LP 50Hz - 3kHz Bass Boost - Variable 0-9 dB @ 45Hz Remote Level Control Included - No - (Optional Accessory) Input Sensitivity (Low) - 200mV - 3.5V Max Current Draw - 125A @ 1060 Watts 20% THD Fuse - 2 x 25 Amp Dimensions - 8.173"(L) x 6.268 "(W) x 2.086"(H)