Line In
Line-in symbol. PC Guide color Light blue.
Line in expects the kind of voltage level and impedance that line out provides. Typically, the line out connector of one device can be connected with the line in of another. However, doing this with a straight cable directly connected to both devices and having both devices on AC power may cause a ground loop, although some devices provide isolation.
A line input has a high impedance of around 10 kΩ, as is often labeled as "Hi-Z" input (Z being the designator for impedance).
Read more about this topic: Line Level
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