Impedance
Impedance – the resistance of an electronic circuit or component to an ac current. In audio engineering the ac current is an audio signal, and, unfortunately, impedance varies with the frequency of the signal fed through the circuit or component. Basically, audio devices are either high impedance or low impedance and a high-impedance device or output shouldn’t be plugged into a low-impedance device or input and vice versa. With the correct use of connectors and pre- amplifiers such connections and errors should be virtually impossible.
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