Description The MPC-XU is a dual-channel universal crossover filter accessory for use with JBL MP. and MPA power amplifiers. The MPC-XU is user configurable to fulfill these functions. . active crossove. . bandpass filte. . subsonic filte. . ultrasonic filte. The MPC-XU allows independent filtering o. the two audio channels. The choices are. . high-pass filtering (selection of 19 frequencies. . low-pass filtering (selection o. 17 frequencies. . bandpass filtering (selection o. any combination of