DESC: The GTO 601.1 features a high-efficiency Class D topology that draws far less current from your vehicle's electrical system. The "Direct Connect" terminal block power connectors allow for either 8 gauge or 4 gauge power wire, and the die-cast aluminum heat sink features a Plexiglas viewing window. Other features include variable low-pass crossover, high and low-level inputs, full-range preamp outputs, and variable bass boost.