I've been using a Kicker KX3 since 2007, Spec's below;
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Model KX3
KICKER KX3 is a 3-way 18dB/octave active electronic crossover with one variable low pass and two variable high pass filters. Remote control bass boost is variable to +18dB at 40Hz. Also features 24dB/octave subsonic filter, two stereo inputs, and three stereo outputs for versatile control.
Front and Rear High Pass Crossovers 18dB/octave, Variable Frequency (35-400Hz - 20x Multiplier Option on Front Crossover)
Sub Low Pass Crossover 18dB/octave, Variable Frequency (45-250Hz)
Bass Boost Variable to +18dB at 40Hz
Remote Level Controller
24dB/octave Subsonic Filter
Two Stereo Inputs with Parallel Input Option
Three Stereo Outputs (5V rms)
Signal-to-Noise Ratio >110dB