Hybrid Aluminum Alloy Heatsink for Optimum Dissipation. 2-ohm Stereo & 4-ohm Bridged Full Range Operation. 2-ohm Minimum Impedance Monoblock Operation. MOSFET Power Supply with Audiophile Grade IRTM Transistors. Military Grade SMT PCB Maintains Dynamic Performance. Direct Short, Thermal, & Overload Circuits Protect Ampllifier. 200mV-12V High Level or Low Level RCA Input. Quick Disconnect RCA/High Level Wire Harness. Quick Disconnect Power and Speaker Output Harness. Variable 12dB High Pass, Low Pass, & Subsonic Crossovers.