DESC: The GTO 301.1 features a high-output MOSFET PWM (Pulse Width Modulation) power supply for plenty of power, even at low-impedance loads. 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 12 dB bass boost.