Analysis of information sources in references of the Wikipedia article "Line level" in English language version.
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The nominal level is sometimes the maximum that can be recorded on a given medium, but this is not true for electronic systems such as mixing consoles, where the maximum possible level is often 20 dB or more above the nominal level.
The +4 dBu audio signal from the mixer and DSP has signal peaks that exceed the nominal level by 20 dB or more.
Practically speaking, electrical engineering transmission line theory does not apply to real world audio lines. ... This paves the way for simple R-C modeling of our audio line.
Outputs are low impedance and must only be connected to high impedance inputs -- never, never tie two outputs directly together -- never. If you do, then each output tries to drive the very low impedance of the other, forcing both outputs into current-limit and possible damage. As a minimum, severe signal loss results.
