The SB-432XL electronic crossover has high-pass filters that cut the subsonic low frequency and protects the speaker from damage. It includes a phase switch and separate high / low frequency gain adjustments. It’s Perfect and Easy for different system connections. The SB-432XL is a stereo 2-way or 3-way crossover (or mono 4-way crossover) 24dB/octave crossover, and can be used in stereo or mono operation mode.