So if I hook it up to the output of the pre-amp that will give me the levels from the pre-amp right before it goes out the XLR right? Don't meters usually measure between the input and the pre-amp circuit? I mean the equipment/DAW or whatever the pre-amp is connected to will be able to tell me the output levels of the pre-amp, right?
Does not being able to measure how hot the input signal matter? I guess I'm confused now!
Normally, the VU meters are on the output of the preamp. If you put this on the input, I don't think you'd see anything as the mic level signals will be very small. The meter needs 0.775Vrms to even read 0dBVU.
Now, if you have a compessor, or EQ or any other line level gear, then you can meter either the input or output (or use a switchable configuration).
But for mic preamps, the output is where you connect the VU meter.