Nady CX-23SW 3-Way Stereo, Plus Subwoofer Crossover - Fits in a 19" Single Rack Space (1U) &ndash; For multi-amplifier setup Splits stereo signals into 3 stereo bands (LOW / MID / HIGH) and a 4th mono band for the subwoofer. For use with 3-way speakers in combination with a subwoofer, the CX-23SW connects directly to the 3 speaker amplifiers and subwoofer via XLR connectors Phase inversion switches on the MID and HIGH bands allows driver phase adjustment, and low-cut subsonic filters provide low frequency driver protection Crossover Frequency Controls, and Low/Mid/High/Sub Output Level Controls Servo-balanced XLR & 1/4" Combo Input Jacks, Stereo Low/Mid/High balanced XLR output jacks and one dedicated subwoofer XLR output jack Shielded internal power supply with AC voltage select switch (~115V/60Hz or ~230V/50Hz)