Mackie Big Knob Studio Command System Operation Manual page 10

2-TRACK A Level Switch
This two-position switch sets the input level of the
2-TRACK A inputs to either +4 dB (balanced input)
or –10 dB (unbalanced input). Use the +4 dB setting
for professional equipment operating at the +4 dBu
standard, and use the –10 dB setting for consumer
equipment operating at the –10 dBV standard.
2-TRACK A Trim Control
This control adjusts the input sensitivity of the
incoming 2-TRACK A signal by ±10 dB (unity at
center detent). This allows for precise level matching
between the various incoming 2-track sources, which
often do not have output level controls of their own.
2-TRACK B Inputs
These stereo 1/4-inch balanced/unbalanced inputs
are fed by the outputs of the second external 2-track
recorder. If a mono signal is plugged into the LEFT
input only, it is automatically routed to both LEFT
and RIGHT inputs.
2-TRACK B Level Switch
This two-position switch sets the input level of
the 2-TRACK B inputs to either +4 dB (balanced)
or –10 dB (unbalanced). Use the +4 dB setting for
professional equipment operating at the +4 dBu
standard, and use the –10 dB setting for consumer
equipment operating at the –10 dBV standard.
2-TRACK B Trim Control
This control adjusts the input sensitivity of the
incoming 2-TRACK B signal by ±10 dB (unity at
center detent). This allows for precise level matching
between the various incoming 2-track sources, which
often do not have output level controls of their own.
DAW MIX
These stereo 1/4-inch balanced/unbalanced in-
puts are fed by the master mix output of the DAW,
usually the DAW outputs 1-2. If a mono signal is
plugged into the LEFT input only, it is automatically
routed to both LEFT and RIGHT inputs.
DAW MIX Level Switch
This two-position switch sets the input level of the
DAW MIX inputs to either +4 dB (balanced input) or
–10 dB (unbalanced input). Use the +4 dB setting
POWER
A
MONITOR
ON
-10dB
+4dB
L
AC SELECT
100 - 120V 220 - 240V
R
BAL/UNBAL
10
BIG KNOB
OUTPUTS
B C
MONITOR MONITOR
2-TRACK 2-TRACK
A B
4 4
+ dB + dB
-10dB -10dB
+4dB + 4dB
-10 -10
dB dB
L L L L
R R R R
BAL/UNBAL BAL/UNBAL BAL/UNBAL BAL/UNBAL
for professional equipment operating at the +4 dBu
standard, and use the –10 dB setting for consumer
equipment operating at the –10 dBV standard.
DAW MIX Trim Control
This control adjusts the input sensitivity of the
incoming DAW MIX signal by ±10 dB (unity at center
detent). This allows you to precisely fine tune the
incoming level of the DAW MIX input so it matches
the signal level of other incoming 2-track sources.
PHONO
These stereo RCA unbalanced inputs are fed by the
outputs of a turntable with a moving-magnet cartridge
(MM). These inputs have a built-in precision RIAA
preamplifier that provides the equalization and gain
required for a phono-level signal to return it to a
proper line-level signal.
This allows you to playback vinyl records and dub
them to a 2-track recorder, as well as send the
phono signal to the input of the DAW for archiving/
restoration/CD burning.
Note: Two RCA shorting plugs are provided, which
should be plugged into the PHONO inputs when they
are not being used. This terminates the inputs and
reduces the noise floor should you accidentally push
in the PHONO INPUT SOURCE SELECT button.
PHONO Trim Control
This trim control adjusts the input sensitivity of
the incoming PHONO signal by ±10 dB. This allows
you to precisely fine tune the incoming level of the
PHONO input so it matches the signal level of other
incoming 2-track sources.
The PHONO input does not need a +4/–10 level
switch since a phonograph is always at a consumer
signal level, unlike tape decks and soundcards,
which could be –10 or +4, depending on the model.
PHONO Grounding Lug (GND)
This small grounding lug allows you to connect the
grounding wire from an attached turntable. This
prevents ground loops and hum from showing up in
the phono source's audio signal.
DAW PHONES MIX INPUT
These stereo 1/4-inch balanced/unbalanced inputs
allow connection of a second stereo mix from the
DAW for a custom headphone mix.
DAW
STUDIO
DAW PHONES PHONES
AMP
OUTPUT MIX INPUT
4 4
+ dB + dB + 4
dB
-10dB
+ 4dB
-10 -10
dB dB -10 dB
L L L L
R R R R
BAL/UNBAL BAL/UNBAL BAL/UNBAL BAL/UNBAL
SOURCES
2 - TRACK 2 - TRACK
+ 4dB
- 10dB
A B
(MONO)
L R
U U
BAL/
-10dB -10dB
+ 10dB + 10dB
UNBAL
+ 4dB
DAW
PHONO
- 10dB
MIX
(MONO)
L R
U U
-10dB 10dB BAL/ -10dB 10dB
+ +
UNBAL
+ 4dB
- 10dB
(MONO)
L R
BAL/
UNBAL
TALK BACK
GROUND
FOOT
SWITCH
L R
RIAA