Master Controls; Phantom Power Switch; Power Led; Meters - Mackie ProFX12 Owner's Manual

R R
ST RETURN
STEREO GRAPHIC EQ
U
36
15
10
+20
5
GAIN
0
5
EQ
U
10
15
HI
12kHz
125 250
+15
U
37
MAIN MIX
MON
MID
2.5kHz
+15
U
LOW
FX PRESETS
80Hz
48
01 BRIGHT ROOM
02 WARM LOUNGE
+15
03 SMALL STAGE
04 WARM THEATER
AUX
U
05 WARM HALL
06 CONCERT HALL
49
07 PLATE REVERB
MON
08 CATHEDRAL
09 CHORUS
+15
10 CHORUS + REV
U
11 DOUBLER
12 TAPE SLAP
13 DELAY 1 (300ms)
FX
14 DELAY 2 (380ms)
52
15 DELAY 3 (480ms)
+15
16 REVERB + DLY (250ms)
PAN
U
51
OL
+15
L R O O
FX MASTER
42 43
MUTE MUTE
OL
11/12 ST RTN
dB
10
5
U
5
44 45
10
20
30
40
50
60
O O
BAL /
R
UNBAL
FX SEND MAIN OUT
500 1K 2K 4K 8K
38
EQ IN
BYPASS
USB
U
39
+10
O O
INPUT LEVEL
PRESETS
40
MUTE
50
USB THRU
U
53 41
+15
O O MAX
O O
FX TO MON PHONES
MON
FX RTN
dB dB
10 10
5 5
U U
5 5
46
10 10
20 20
30 30
40 40
50 50
60 60
O O O O
PHONES

Master Controls

31
15
48V

31. PHANTOM POWER SWITCH

10
PHANTOM
5
POWER
If the microphones need phantom power, press
0
32
in this switch to add phantom power to all the XLR
5
POWER
microphone inputs of the mixer. This lets the mixer
10
MAIN
send low-current DC voltage to the mic's electronics
15

METERS

through the same wires that carry audio. The LED will
0dB=0dBu
turn on as a reminder that phantom power is engaged.
OL
15
10
Most modern professional condenser mics require
6
phantom power. Semi-pro condenser mics often have
3
33
0
batteries to accomplish the same thing. "Phantom" owes
2
4 its name to an ability to be "unseen" by dynamic mics
7
(Shure SM57/SM58, for instance), which don't need
10
20
external power and aren't affected by it anyway.
30
L R
34
BREAK
not plug instrument outputs into the mic input jacks
(MUTES ALL CHANNELS)
U
with phantom power on, unless you know for certain it
35
is safe to do so.
+20
O O
TAPE LEVEL

32. POWER LED

MAIN
This LED comes on when the mixer is plugged into
the AC mains supply, and the rear panel power switch
dB
[2] is on.
10
If the LED does not turn on, make sure the
5
AC power is live, both ends of the power cord are
U
correctly inserted, the electricity bill has been
5
paid and the lights in town are on.
47
10
33. METERS
20
30
These meters have 2 columns of 12 LEDs each,
with dB markings from –30 to +15, and OL (overload
40
50
at +20 dBu). They indicate the stereo signal strength
60
O O
of the main mix after the main fader [47].
Typically, these meters should be bouncing between
the "0" and the "+3" LEDs. It is okay if the OL LEDs light
occasionally, but if they light frequently or continuously,
turn down the main fader until they blink occasionally
or not at all.
Remember, audio meters are just tools to help assure
that the levels are "in the ballpark." You don't have to
stare at them (unless you want to).
Never plug single-ended (unbalanced)
micro phones, or ribbon microphones into the
mic input jacks if phantom power is on. Do
Owner's Manual
21