Definitions for "High impedance"
A method of sending the signal from one piece of electronic equipment to another where the voltage is relatively high and the current is relatively low. There are less electronics needed in the equipment but it is more susceptible to outside interference noise like a light dimmer or ground loops. It is usually not used in a broadcast station anywhere for audio but often used in churches between equipment. Most churches do not use it for microphones because of the extra noise it picks up.
(High-Z) A mike system that uses 2-wire cable, is limited to relatively short cable runs from amp to mike, and that is subject to feedback problems. High impedance equipment is usually cheaper than low impedance.
An audio device with an electrical impedance of 5,000 ohms or more.