Maybe it's my turn to come along and say STOP! Figure out what's going on, and fix it. You don't even know that it's "low voltage". Only that the current is limited to a level that does not cause a serious shock -- for now.
I'd start with the building wiring to make sure it is beyond reproach. Then check bonding throughout the audio system. If this doesn't make sense get a qualified electrical person to troubleshoot it. Good luck . --Frank
All microphones are connected to the XLR PIN1 to the housing
This means that even if your mixer is grounded
Once you touch any device that has leakage but is not grounded
and touch the microphone through your hand.
that current flow between your dual hands....
So it’s important to keep your equipment grounded.