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In Stereo mode, CH1 output adjusts the output gain of both channels and CH2 output control acts as
a power summed Balance control. There is a slight drop in output level in stereo mode when the
Balance knob is centered vs. at one extreme or another.
When the switch is in the “Dual” position the output controls act on only their respective channels.
+4/-10 switch (rear panel)
The +4/-10 switch is used to set the output level of the PRO MPA II for the appropriate system levels.
This feature allows you to match 0 VU on the meters of the PRO MPA II and your mixer or other
equipment.
When depressed, 0 VU on the output meter corresponds to +4dBu on the outputs. In –10 mode, the
output level measures –10dBV.
Meter Trim
The Meter Trim is used to adjust the Meter’s “0” point when. This may change if the unit is NOT
mounted with the front panel perpendicular to the floor.
Using a small flat-blade screwdriver you can mechanically fine-tune the meter indicator position if, for
example, it does not rest at the leftmost position when the unit is OFF.
Adjustments for feedback readings, when the unit is in use, are internal and are not user serviceable.
Front Panel connections
Instrument Inputs
The ¼” jacks on the front panel serve as an instrument input. The input impedance is always >1M
Ohm and the gain can be adjusted by the Input gain control. The maximum input signal level is
+17dBu (5V RMS) @ minimum input gain.
When you plug into this jack it DISABLES the balanced input on the rear of the unit. This feature
allows you to keep the rear input patched in, and use the instrument input to switch to a different
source. The instrument input allows the PRO MPA II to serve as a great DI device as well.
