The Reference 1600a 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. Port for future expansion products provided. Power Output: 400 watts RMS x 1 channel at 4 ohms and ? 1% THD + N Signal-to-Noise Ratio: 85dBA (reference 1 watt into 4 ohms) Dynamic Power: 600 watts at 2 ohms Effective Damping Factor: 6.3 at 4 ohms Frequency Response (-3dB): 11Hz to 330Hz (-3dB) Maximum Input Signal: 6V Maximum Sensitivity: 100mV