Good point. There can be many sources of electromagnetic interference in a church (or any commercial building), such as industrial heating/AC, refrigeration, fluorescent lighting, neon signs (well, maybe not in most churches!), electrical wiring, etc. Using balanced cables in such situations is important.

Aside: I played in one church that was next to a radio transmission tower. We could not get the station's signal out of the audio no matter what. It also played in the toaster etc. The church burned down, cause unknown. I always wondered what was pulsing in the building's electrical wiring...


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