Portable four-module minirack for Wisycom radio mic systems. Supplied as a base unit with 2 MSR918 receivers, a CST910 transmitter module, and a PSS903 power supply. It provides RX active-antenna powering and a splitter to feed both receivers, with A/B diversity antenna inputs, a transmitter antenna output, and multiple XLR audio/GPI connections. AC or DC powering is selectable on the front panel.