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A wire carrying an electrical current creates a magnetic field around it. When
that magnetic field penetrates into another wire, it causes an electric
current in the second wire with the same waveform as the current in the first
wire. This magnetic transfer is called inductance.
This is particularly bad in audio when AC power lines or amplifier speaker
lines are run next to (parallel) other low-current carrying lines
(microphone/line level). The same effect occurs if the lines are coiled and on
top of each other. The best defense against this type of interference is to
keep different current carrying cables away from each other; run them in
different conduits. If they need to cross each other, do so at 90-degree
angles. Measured in henrys.
Source: Church Audio & Acoustics Glossary
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