Front Panel Features; Connection Section; Mic Inputs; Line/Hi-Z Switch - Mackie ProFX12 Owner's Manual

Front Panel Features

MIC MIC
5
6
1 2
LINE
HI-Z
7 8 8
BAL / BAL /
UNBAL UNBAL
LINE/HI-Z IN 1 LINE IN 2 LINE IN 3
10 10 10
INSERT INSERT INSERT
U U

Connection Section

LEVEL LEVEL
SET SET
U +50 U +50 U
+30dB +30dB
-20dB -20dB -20dB
GAIN GAIN GAIN
LOW CUT LOW CUT LOW CUT
This is where to plug things in: microphones, line-
100 Hz 100 Hz
EQ EQ
U U
level instruments and effects, headphones, and the
HI HI
12kHz 12kHz
ultimate destination for your sound: PA system, stage
-15 +15 -15 +15 -15
U U
monitors, effects processors, CD player/recorder, etc.
MID MID
2.5kHz 2.5kHz
-15 +15 -15 +15 -15
See Appendix B for further details and drawings of
U U
LOW LOW
the connectors to use with the ProFX mixer. 80Hz 80Hz
-15 +15 -15 +15 -15
AUX AUX
U U

5. MIC INPUTS

MON MON
+15 +15
O O O O O O
U U
We use phantom-powered, balanced microphone
FX FX
inputs just like the big studio mega-consoles for
+15 +15
O O O O O O
PAN PAN
exactly the same reason: This kind of circuit is
excellent at rejecting hum and noise. You can plug
L R L R L
in almost any kind of mic that has a standard XLR
MUTE MUTE
OL OL OL
male mic connector.
1 2
dB dB dB
10 10 10
Professional ribbon, dynamic and condenser mics will
5 5 5
all sound excellent through these inputs. The ProFX
U U U
mixer's mic inputs will handle any kind of mic level
5 5 5
tossed at them without overloading. Be sure to perform
10 10 10
the gain-setting procedure mentioned on page 3.
20 20 20
30 30 30
40 40 40
PHANTOM POWER 50 50 50
60 60 60
O O O O O O
Most modern professional condenser mics
require phantom power which lets the mixer send
low-current DC voltage to the mic's electronics through
the same wires that carry audio. (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.
The ProFX mixer's phantom power is globally
controlled by the phantom power switch [31]. (This
means that phantom power for all mic inputs is turned
on and off together.)
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.
MIC MIC MIC
3 4 5/6
(MONO)
8
BAL / BAL /
L
UNBAL UNBAL
9 9
BAL /
LINE IN 4 LINE IN 5
UNBAL
10 R
INSERT LINE IN 6
U U
LEVEL LEVEL LEVEL
SET SET SET
+50 U +50
U +50
+30dB +30dB
-20dB
GAIN GAIN
LOW CUT LOW CUT
100 Hz 100 Hz 100 Hz
EQ EQ EQ
U U U
HI HI HI
12kHz 12kHz 12kHz
+15 -15 +15 -15 +15
U U U
MID MID MID
2.5kHz 2.5kHz 2.5kHz
+15 -15 +15 -15 +15
U U U
LOW LOW LOW
80Hz 80Hz 80Hz
+15 -15 +15 -15 +15
AUX AUX AUX
U U U
MON MON MON
+15 +15 +15
O O O O
U U U
FX FX FX
+15 +15 +15
O O O O
PAN PAN PAN
R L R L R
MUTE MUTE MUTE
OL OL
3 4 5/6
dB dB
10 10
5 5
U U
5 5
10 10
20 20
30 30
40 40
50 50
60 60
O O O O
MIC
(UNBALANCED)
L
L
TAPE
TAPE
IN OUT
R R
7/8 9/10 11/12
(MONO) (MONO) (MONO)
L L
9 9
BAL / BAL /
LINE IN 7 LINE IN 9 LINE IN 11
UNBAL UNBAL UNBAL
R R
LINE IN 8 LINE IN 10 LINE IN 12
U U
LEVEL
SET
U +50 -20 +20 -20 +20
GAIN GAIN GAIN
LOW CUT

6. LINE/HI-Z SWITCH

100 Hz
EQ EQ
U U U
To connect a guitar directly to the mixer without
HI HI
12kHz 12kHz 12kHz
-15 +15 -15 +15 -15 +15
using a DI Box, press this switch in first; then connect
U U U
MID the output from the guitar to channel 1's 1⁄4" TRS MID
2.5kHz 2.5kHz 2.5kHz
-15 +15 -15 +15 -15 +15
U input [7]. The input impedance is optimized for direct U U
LOW LOW
80Hz 80Hz
connection and high-frequency fidelity is assured.
-15 +15 -15 +15 -15 +15
AUX AUX AUX
U U U
In the out position, channel 1's 1⁄4" TRS input
MON MON MON
becomes a line input just like the other mono line
+15 +15 +15
O O O O O O
U U U
inputs [8].
FX FX
+15 +15 +15
O O O O O O
PAN PAN PAN
To use guitars or other instruments on other
channels, you will need to use an external DI box
L R L R L R
first. Without the DI box – or if this switch is not
MUTE MUTE MUTE
pressed in – guitars may sound dull and muddy.
OL OL OL
7/8 9/10 11/12
dB dB dB
10 10 10

7. LINE/HI-Z INPUT (Channel 1 only)

5 5 5
U U U
This 1/4" jack shares circuitry (but not phantom
5 5 5
power) with the mic preamp and may be driven by
10 10 10
balanced or unbalanced sources.
20 20 20
30 30 30
To connect a balanced line to this input, use a 1⁄4"
40 40 40
50 50 50
Tip-Ring-Sleeve (TRS) plug.
60 60 60
O O O O O O
To connect an unbalanced line to this input, use a 1⁄4"
mono (TS) phone plug or instrument cable.
This line-level input may also accept instrument-level
signals if the hi-z switch [6] is pressed in. This allows
you to connect guitars directly into channel 1 without
the need for a DI box.
(MONO)
BAL /
L L
UNBAL
BAL / BAL /
MON SEND
UNBAL
BAL /
R R
UNBAL
ST RETURN FX SEND MAIN OUT
STEREO GRAPHIC EQ
15
10
5
0
5
EQ
10
15
HI
125 250 500 1K 2K 4K
MAIN MIX EQ IN
MON BYPASS
MID
USB
LOW
FX PRESETS
80Hz
01 BRIGHT ROOM
02 WARM LOUNGE
03 SMALL STAGE
04 WARM THEATER
05 WARM HALL
06 CONCERT HALL
07 PLATE REVERB
O O
08 CATHEDRAL
09 CHORUS INPUT LEVEL
10 CHORUS + REV
PRESETS
11 DOUBLER
12 TAPE SLAP
MUTE
13 DELAY 1 (300ms)
FX
14 DELAY 2 (380ms)
15 DELAY 3 (480ms)
USB THRU
16 REVERB + DLY (250ms)
U U
OL
+15 +15
O O O O
O O
FX MASTER FX TO MON PHONES
MON
MUTE
OL
ST RTN FX RTN
dB dB dB
10 10 10
5 5 5
U U U
5 5 5
10 10 10
20 20 20
30 30 30
40 40 40
50 50 50
60 60 60
O O O O O O
Owner's Manual
L
BAL /
FOOTSWITCH
UNBAL
R
PHONES
15
48V
10
PHANTOM
5
POWER
0
5
POWER
10
MAIN
15
METERS
8K
0dB=0dBu
OL
15
10
6
3
0
2
4
U
7
10
20
30
+10
L R
BREAK
(MUTES ALL CHANNELS)
U
+20
MAX
O O
TAPE LEVEL
MAIN
dB
10
5
U
5
10
20
30
40
50
60
O O
13