How do I connect a Shure MX418D to a Shure bodypack?
The MX418D requires phantom power to operate. Phantom is defined as 11 to 52 volts DC and delivered on a balanced line. Shure bodypacks provide 5 volts DC of bias delivered on an unbalanced line. Therefore, a direct connection will not work. (Beware - some wireless mic manufacturers claim their transmitters provide "phantom power", when they mean "bias".)
Here are two options:
1. Install a battery operated phantom supply between the MX418D and the wireless bodypack.
2. Use the MX418SE instead. Disconnect the mic from the in-line preamp (which requires phantom), install a TA4F connector on the mic cable, and connect the microphone directly to the wireless bodyback.