Quarter-inch analog – MOTU 828x 28x30 Audio Interface with ThunderTechnology User Manual
Page 26
I N S T A L L I N G T H E 8 2 8 X H A R D W A R E
26
Combo jack summary
Use these general guidelines for the 48V phantom
power, pad and trim settings on the two combo
input jacks:
Quarter-inch analog
The eight quarter-inch analog inputs and outputs
(Figure 4-4) 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
adjust these trims using CueMix FX, see “Input
trim” on page 75. To adjust the trims using the
front panel LCD:
1
Push the CHANNEL knob repeatedly until you
see “I:” (which stands for
Input
) in the CHANNEL
section of the LCD (Figure 4-5).
2
Turn the CHANNEL KNOB until you see the
desired analog input or output pair. For example,
analog inputs 1-2 appear as “I:An 1-2”
(Figure 4-5), which means
Input analog 1-2
.
3
From the factory, analog inputs are grouped in
stereo pairs (1-2, 3-4, etc.) If you need to split a pair
to deal with it as two individual mono inputs, turn
the PARAMETER knob until you see PAIR in the
parameter section of the LCD (Figure 4-5). Turn
the VALUE knob to choose MONO. Then turn the
CHANNEL knob again to select the desired input
you are adjusting.
Figure 4-5: The settings for analog inputs 1 and 2 (as a pair).
4
After splitting the stereo pair, if necessary, turn
the PARAM knob until you see the TRIM
parameter in the LCD (Figure 4-6):
Input 48V
Pad
Trim
Condenser mic
On
As needed
As needed
Dynamic mic
Off
As needed
As needed
Guitar
Off
n/a
As needed
-10 dB Line level via TRS
Off
n/a
As needed
-10 dB Line level via XLR
Off
-20 dB
+12dB
+4 dB line level (XLR only)
Off
-20 dB
Zero
Figure 4-4: 828x back panel