Extra Heavy Duty Die Cast Heatsink MOSFET Power Supply Variable Hi/Lo Pass Crossovers Bass Boost 2 Ohm Stereo Stable Hi/Lo Level Inputs Soft Turn on/Off Circuit Discrete Wire Connections Power LED Indicators Soft Turn-On/Off circuit eliminates the annoying "pop." on power up or power down Gold Plated RCA connectors for minimized line-loss, resistance and corrosion resistance. Variable Gain Control. Multi-Mode Bridgeable channels offer wide choice of output configurations and possibilities.