Infinity Reference 1600a 600-Watt, High-Performance Mono Subwoofer Amplifier (Silver/Black) 600-Watt mono Class D subwoofer amplifier with on-board electronic crossover and variable bass boost circuit 12dB per octave electronic crossover allows you to optimize bass performance based on enclosure type and subwoofer Full-range preamp outputs facilitate use of multiple amplifiers without the need for adapters or signal splitters One-year warranty