The 4XS is an extremely flexible crossover. Whether you need a 2-, 3-, or even 4-way crossover, this one is for you. With 2 or 4 channel input options, Programmable Frequency Match (PFM) subsonic filter, and optically-coupled power supply make the 4XS an indispensable part of any truly sophisticated system.
State-Variable, 18dB per Octave, 2-way Active Crossover
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Four Channel, Two-Way or Two Channel, Three-Way Operation
Module Programmable Crossover Frequency
Output Level Controls
Programmable Frequency Match (PFM) Subsonic Filter for Subwoofer Control and Protection
says it will put out 9.5v rms