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I have struggled with this for a long time. So, without reference to any texts, here goes: Output/source impedance should be low, in order to not force the source circuit to provide a high current and "drag it down", while being just high enough impedance to not affect the source circuit's operation. This also allows RF noise to go to ground easily, and the source signal to have a small capacitance to ground inside the connecting cable. Input impedance is high for the same but opposite reasons. Allows the signal current to be small, and doesn't "load" the input circuit, thereby risking changing IT'S operating parameters. This way the signal voltage is able to modulate the input, passing the signal on, but that's really about it. This in relation to the "line out" circuit that's in my head at the moment. Right? -ish?
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