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Old 03-31-2017, 06:50 AM   #10
drumphil
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Quote:
Originally Posted by grinder View Post
Arran are you able to fill me in on how a "jack" is able to be "calibrated for an unbalanced -10dBV" I truly do not understand this as a normal jack is just a physical connection. Is there an included resister of something?

Grinder
The physical plug isn't what's causing the difference in level. It's the electronics connected to each plug that cause the difference.

Here is an example. Imagine you have a mixing desk that accepts balanced line level TRS connections. Then you add XLR connectors for a mic, and you add an op amp that boosts the mic level signal up to line level when connected to the XLR plug, and then connects to the same wires as the line level input.

Now you get a different level depending on which plug you use, because the design assumes that TRS connections will have signal at line level, and XLR connections will have a mic connected to them that outputs mic level signals.
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