Instrument Input; Polarity Inverter; Vu Meter; Direct Output - API 3124mb+ Operator's Manual

4.3.3
4.4 Polarity Inverter
A polarity inverter (sometimes referred to as a "phase reverse") is available at the input of the
preamplifier.
4.5 VU Meter
4.6 Direct Output
Each preamplifier's output is available at its respective OUTPUT connection on the rear panel.


Instrument Input
The ¼" jack on the front panel is the active input when the MIC switch is not
engaged.

‐10 dB instrument level input

Unbalanced, high‐impedance input (¼" tip‐sleeve)
GAIN: Instrument preamp level control

14 dB minimum gain

50 dB maximum gain
POL (Polarity): Inverts the polarity of the signal at the input of the preamplifier.

Yellow LED above switch illuminates when engaged
The preamplifier outputs can be monitored via the VU meter in each input section.
XLR connection
Plugging into the OUTPUT jack does not break the connection to the INSERT jack
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