4.1
Owner's of the Mackie Music Mixer ProFX12 gave it a score of 4.1 out of 5. Here's how the scores stacked up:
21
Owner’s Manual
Owner’s Manual
Master Controls
32. PHANTOM POWER SWITCH
If your microphones need phantom power, press in
this switch to add phantom power to all the XLR mi-
crophone inputs of the mixer. This lets the mixer send
low-current DC voltage to the mic’s electronics through
the same wires that carry audio. The LED will turn on as
a reminder that phantom power is engaged.
Most modern professional condenser mics require
phantom power. Semi-pro condenser mics often have
batteries to accomplish the same thing. “Phantom” owes
its name to an ability to be “unseen” by dynamic mics
(Shure SM57/SM58, for instance), which don’t need
external power and aren’t affected by it anyway.
Never plug single-ended (unbalanced) micro-
phones, or ribbon microphones into the mic
input jacks if phantom power is on. Do not
plug instrument outputs into the mic input jacks with
phantom power on, unless you know for certain it is safe
to do so.
33. POWER LED
This LED comes on when the mixer is plugged into
the AC mains supply, and the rear panel power switch
[3] is on.
If the LED does not turn on, make sure the AC power
is live, both ends of the power cord are correctly in-
serted, your electricity bill has been paid, and the lights
in town are on.
If you suspect the fuse is blown, disconnect
the power cord before removing and inspect-
ing the fuse located below the AC input.
34. METERS
These meters have 2 columns of 12 LEDs each, with
dB markings from –30 to +15, and OL (overload at +20
dBu). They indicate the stereo signal strength of the
main mix after the main fader [48].
Typically, you want to see these meters 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
you that your levels are “in the ballpark.” You don’t have
to stare at them (unless you want to).
8K4K2K1K500250125
15
15
10
10
5
5
0
15
15
10
10
5
5
0
PHONES
STEREO GRAPHIC EQ
ST RTN FX RTN
U
+15
FX TO MON
FX MASTER
U
+15
OO
OO
dB
30
20
10
10
OO
40
50
5
5
U
60
dB
30
20
10
10
OO
40
50
5
5
U
60
dB
30
20
10
10
OO
40
50
5
5
U
60
dB
30
20
10
10
OO
40
50
5
5
U
60
PRESETS
FX PRESETS
01 BRIGHT ROOM
02 WARM LOUNGE
03 SMALL STAGE
04 WARM THEATER
05 WARM HALL
06 CONCERT HALL
13 DELAY 1 (300ms)
14 DELAY 2 (380ms)
15 DELAY 3 (480ms)
16 REVERB + DLY (250ms)
07 PLATE REVERB
08 CATHEDRAL
09 CHORUS
10 CHORUS + REV
11 DOUBLER
12 TAPE SLAP
MON
MAIN
0dB=0dBu
MAIN
METERS
OL
4
6
3
10
15
7
10
20
30
0
2
BREAK
(MUTES ALL CHANNELS)
PHANTOM
POWER
POWER
OO
+20
U
TAPE LEVEL
OO
+20
U
USB THRU
OO
MAX
OL
OL
MAIN MIX
MON
EQ IN
BYPASS
RL
INPUT LEVEL
USB
MUTE
MUTE
48V
37
38 39
32
33
34
35
36425452
50
49
51
40
41
45 46 47 48
43 44
53
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