300-Watt mono subwoofer amplifier with on-board electronic crossover and variable bass boost circuit. ? The Reference 1300a features a 12dB per octave electronic crossover, allowing you to optimize bass performance based on enclosure type and subwoofer selection. ? Full-range preamp outputs faciliate use of multiple amplifiers without the need for noisy and expensive adapters or signal splitters. ? Remote level bass control included ? Port for future expansion products provided.