MOTU 828 Mk III Hybrid User Manual page 22

Trim
Both the low-impedance XLR mic input and the
high-impedance quarter-inch guitar input are
equipped with 53 dB of digitally controlled analog
trim. Use the detented trim knobs next to each jack
to adjust the input level as needed for each input.
The LCD provides visual feedback as you turn the
trim knob.
Figure 4-5: The LCD gives you feedback as you turn the TRIM knobs for
the two mic/guitar inputs.
The 828mk3's input trims are digitally controlled,
so they allow you to make fine-tuned adjustments
in 1dB increments. You can also adjust trim in the
MOTU CueMix FX software. See "Input trim" on
page 72.
20 dB pad
The mic input (XLR jack) is equipped with a 20 dB
pad, so "hot" signals are best connected via an XLR
cable so that you can use the pad. To toggle the
20 dB pad for a mic input, quickly push its TRIM
rotary encoder. The green LED below will turn on
or off accordingly.
Since the pad is not available on the TRS jack, hot
signals connected via the TRS jack will probably
overdrive the input.
Figure 4-4: 828mk3 front panel
22
Combo jack summary
Use these general guidelines for the 48V phantom
power, pad and trim settings on the two combo
input jacks:
Input 48V
Condenser mic On
Dynamic mic Off
Guitar Off
-10 dB Line level via TRS Off
-10 dB Line level via XLR Off
+4 dB line level (XLR only) Off
Quarter-inch analog
The eight quarter-inch analog inputs and outputs
(Figure 4-6) are balanced (TRS) connectors that
can also accept an unbalanced plug.
The quarter-inch outputs are calibrated to produce
a +4 dBu line level output signal.
Quarter-inch analog input trims
The quarter-inch inputs are calibrated to
accommodate either +4 or -10 dBu signals and are
equipped with digitally controlled analog trims
that provide +22 dB of gain and -96 dB of cut. You
can use either the front panel LCD or the included
CueMix FX software to adjust the input trim. To
I N S T A L L I N G T H E 8 2 8 M K 3 H A R D W A R E
Pad Trim
As needed As needed
As needed As needed
n/a As needed
n/a As needed
-20 dB +12dB
-20 dB Zero