The LS4-XO is designed for both live sound and permanent installations. A anytime a bi-amped or tri-amped system is preferred to accurately and electronically crossover the different frequency components of a total system. This will dramatically improve the efficiency and sonic purity of the overall system. This design gives you a 2-way stereo and 3-way mono crossover with professional features such as the 24dB per Octave Linkwitz Riley State Variable Filters, and both balanced XLR & 1/4" T/R/S inputs and outputs.   .....................................................................................................................................