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p.7
mono input module
features
phantom power—+48V
48 volts DC is applied to pins 2 and 3 on the mic-input XLR con-
nector. This option is used with condenser microphones and active direct
boxes that require an external DC voltage (phantom power) in order to
operate.
pad
The mic-input signal is attenuated by 20dB to prevent some signals
(e.g. kick drum or lead vocal) from overloading the preamp stage.The pad
is used to bring a hot mic-input signal down to a controllable level.The
20dB pad is not functional when the
LINE switch is depressed.
line
The input preamp circuit is set up to accept a mic-level signal. This
signal is brought in via the XLR mic-input connector located on the rear
panel.The 1/4" TRS input jack is disabled.
The input preamp circuit is set up to accept a line-level signal from
either the XLR mic-input connector or the 1/4" TRS input jack,both locat-
ed on the rear panel.
When a plug is inserted into the 1/4" TRS input jack, the XLR mic-input
connector is disabled.
polarity reverse—ø
This feature is used for correcting or minimizing polarity and phase relat-
ed errors. For example, occasionally a balanced input connection is
reverse-wired before it gets to the mixing console. This can happen in
microphones, or in snake line interfaces.By using the polarity reverse fea-
ture, this type of error can be corrected.
polarity inverted
polarity not inverted
If the channel peak
LED is illuminated,
first try lowering
the input gain control.
Only when this method is
unsuccessful should the pad
switch be engaged.
+
If the 48V phantom
power switch is
engaged, depressing this
switch disconnects phantom
power from the mic input
XLR.
+
1
When similar signals
from different chan-
nels are combined, phase
cancellations can occur.
Reversing the polarity of an
input signal often corrects
such phasing errors.
+
The 48V switch should
not be engaged when
using standard (dynamic)
microphones, or other
sources that do not use
phantom power.
a