MOTU 828 User Manual page 25

does not affect the quarter-inch input of the
combo jack, which supports line level signals up to
+20 dBu balanced and +18 dBu unbalanced.
Combo jack summary
Use these guidelines for 48V phantom power, pad
and gain settings on the two combo input jacks:
Input
48V
Condenser mic On
Dynamic mic Off
Guitar Off
-10 dBv line level via TRS* Off
-10 dBv line level via XLR* Off
+4 dBv line level via XLR* Off
+4 dBv line level via TRS* Off
*See the next section below for an alternative way to connect line level
signals to inputs 1 and 2 using the insert returns.
Mic inserts
Each mic input (1 and 2) is equipped with a
send/return loop for inserting outboard gear into
the input's signal path. The SEND jack provides
the pre-amplified mic input signal (or the signal
from the input's TRS jack). Connect the SEND
jack to your outboard compressor or other
processor, and then connect the output from the
processor to the input's RETURN jack to re-insert
the signal into the input's signal path.
If nothing is plugged in to the input, the RETURN
jack acts as an additional line input that is identical
to the other analog inputs (described below).
Figure 4-2: 828 back panel
H A R D W A R E I N S T A L L A T I O N
Pad Gain
Off As needed
Off As needed
n/a As needed
n/a As needed
As needed As needed
On As needed
n/a As needed
When nothing is connected to the returns, they
are automatically "normaled" to the send to
receive signal directly from the preamp.
Mic insert gain staging
The 828 mic inputs provide 74 dB of signal gain.
The first 54 dB of gain occur before the insert
point, while the final 20 dB occur after.
Accordingly, when a plug is inserted into the
insert RETURN jack, CueMix 5 provides two
separate gain knobs, as shown below.
Figure 4-3: 54 dB of gain occurs before the insert point, while 20 dB
occurs after. Together, they provide up to 74 dB of gain.
The channel's 20 dB pad is applied before the
insert point, while Phase Invert is applied after.
TRS quarter-inch line inputs/outputs
Quarter-inch line inputs and outputs are balanced
(TRS) connectors. The inputs can also accept an
unbalanced (TS) plug. The outputs are
DC-coupled, so they can be used for control
voltage (CV) output.
Monitor Pair A
Monitor Pair B
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