OT: Audio signal definition

[Bob Rasmussen]

I should know this, but I don't. My son is trying to relate "line level"
vs. "Mic level" vs. dBm. vs. dBu vs. voltage. Can somebody fill me in?

For instance if a mic outputs -56dBm, is that standard mic level? Line
level?

Regards,
....Bob Rasmussen,   President,   Rasmussen Software, Inc.

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