POWER ACOUSTIK BLADE4-1200D Blade Amplifier 4 Channel Compact 5 Chassis Design for Installation Versatility Hybrid Aluminum Alloy Die cast Heatsink for Optimum Dissipation MOSFET Power Supply w/ Audiophile Grade IRTM Transistors Military Grade SMT PCB Maintains Dynamic Performance 2-ohm Stereo & 4-ohm Bridged Full Range Operation Quick Disconnect Speaker Output Harness. Dimensions: 8" X 5" X 2" Direct Short, Thermal, & Overload Circuits Protect Amplifier 200mv-6V Low Level RCA Inputs 12dB High Pass or Low Pass Crossovers