Kicker 08ZX5503 2X75-Watt Amplifier with 400-Watt Subwoofer Channel 2 x 85 Watt stereo amplifier with 400-Watt Subwoofer Channel Built-in 12dB/octave high-, low-, or all-pass electronic crossover variable from 50 to 200 hertz KICKEQ Boost offers up to 18 decibels of bass centered at 40 Hz Balanced differential inputs for noise elimination One-year limited warranty