Excerpt from:
THEORY AND CONSTRUCTION OF MIC "SPLITTERS"

by Bill Whitlock
Read the complete white paper from Jensen.

The Radial Convertible V12 snake is built to Jensen specifications with RF filter networks and secondary winding damping resistors.

Red = RF filter network.
Radio frequency filtering is accomplished with a series network consisting of a 0.01uF ceramic capacitor and a 51ohm resistor on every output that shunts frequencies above 300KHz to ground, but looks "open" at audio frequencies.

Green = Secondary winding damping resistor.
If the splitter will not always be used in a fixed configuration, where any of isolated outputs may not be used, it is recommended to install 2.7 kS damping resistors across HI and LO (pins 2 and 3 for XLR's) output pins. If an output is unused, and especially if it has a cable attached which is open at the far end, the unloaded secondary of the "MB" transformer will exhibit an undamped resonance which can adversely affect frequency response of the system.