Mackie Big Knob Studio Command System Operation Manual page 12

PHONES AMP and STUDIO OUT
The PHONES AMP and STUDIO OUTS have the
option of being fed signal by the currently selected
INPUT SOURCE SELECT buttons (thus mirroring
the mix being heard by the engineer) or the signal
connected to the DAW PHONES MIX INPUT con-
nectors (thus providing a separate unique monitor-
ing mix for the talent).
This allows the engineer to listen to his or her own
master mix in the control room, while allowing the
talent to listen to a customized headphone mix at
the same time through the PHONES 1 or 2 outputs
on the front panel or through an external headphone
amp connected to the PHONES AMP OUTPUT on
the rear panel, as well as the studio monitor outs
(STUDIO OUTS). The choice of which stereo signal
(current source or headphone mix input) is heard is
determined by the PHONES/STUDIO OUTS SOURCE
select button on the front panel.
PHONES AMP OUTPUTS
Connect these stereo 1/4-inch balanced/unbalanced
connectors to an external multi-headphone amplifi-
er. This allows you to connect multiple sets of head-
phones for the talent. The PHONES AMP OUTPUT
level is not affected by the Big VOLUME
the headphone level controls on the front panel. The
headphone amplifier should have its own individual
volume controls for the headphones.
PHONES AMP Level Switch
This two-position switch sets the level of the PHONES
AMP outputs to either +4 dB (out) or –10 dB (pushed
in). Use the +4 dB setting when connecting to balanced
inputs on professional equipment operating at the
+4 dBu standard, and use the –10 dB setting when
connecting to unbalanced inputs on consumer equip-
ment operating at the –10 dBV standard.
POWER
A
MONITOR
ON
-10dB +4dB
L
AC SELECT
100 - 120V 220 - 240V
R
BAL/UNBAL
1
BIG KNOB
OUTPUTS
B C
MONITOR MONITOR
2-TRACK 2-TRACK
A B
+ 4 + 4
dB dB
-10dB +4dB -10dB 4dB
+
-10 -10
dB dB
L L L L
R R R R
BAL/UNBAL BAL/UNBAL BAL/UNBAL BAL/UNBAL
STUDIO OUTS
Connect these stereo 1/4-inch balanced/unbalanced
connectors to a pair of active monitors (or to an
amplifier and passive monitors) in the studio per-
formance space. This allows the performers to hear
playback without having to use headphones, and
allows the control room engineer to communicate
to the performers through the talkback system. The
STUDIO OUTS level is controlled by the STUDIO
OUTS LEVEL
STUDIO OUTS Trim Control
This trim control adjusts the sensitivity of the
STUDIO OUTS signal. Use the +4 dB setting when
connecting to balanced inputs on professional equip-
ment operating at the +4 dBu standard, and use the
–10 dB setting when connecting to unbalanced inputs
on consumer equipment operating at the –10 dBV
standard. Although the trim control is typically set to
one side or the other, it can be adjusted to any setting
between the +4 and –10 positions if necessary.
AC Socket
Connect the included detachable power cord to
this AC socket (2-prong IEC connector) on the rear
panel. Make sure the AC SELECT switch is set to
Knob or
the correct AC voltage (see
POWER Switch
Push this switch up to turn the Big Knob on. Press
the bottom of this switch to put the Big Knob into
standby mode. It will not function, but the circuits
are still live. To remove AC power, either turn off
the AC mains supply, or unplug the power cord from
the speaker and the AC mains supply.
AC SELECT Switch
Set this switch to the 100-120V position for 100 VAC
and 120 VAC power, and to the 220-240V position for
220 VAC and 240 VAC power.
DAW
STUDIO
DAW PHONES PHONES
OUTPUT AMP
MIX INPUT
+ 4 + 4
dB dB + 4
dB
-10dB 4dB
+
-10 -10 -10
dB dB dB
L L L L
R R R R
BAL/UNBAL BAL/UNBAL
BAL/UNBAL BAL/UNBAL
control on the front panel.
AC SELECT Switch).
SOURCES
2 - TRACK + 4dB 2 - TRACK
- 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