Break Switch; Tape Level; Stereo Graphic Eq; Main Mix/Mon - Mackie ProFX12 Owner's Manual

STEREO GRAPHIC EQ

37
15
10
5
0
5
10
15
125 250 500
38
MAIN MIX
MON
FX PRESETS
49
01 BRIGHT ROOM
02 WARM LOUNGE
03 SMALL STAGE
04 WARM THEATER
05 WARM HALL
06 CONCERT HALL
50
07 PLATE REVERB
08 CATHEDRAL
09 CHORUS
10 CHORUS + REV
PRESETS
11 DOUBLER
12 TAPE SLAP
MUTE
13 DELAY 1 (300ms)
14 DELAY 2 (380ms)
53
15 DELAY 3 (480ms)
16 REVERB + DLY (250ms)
U
52 OL 54
+15
O O
O O
FX MASTER
FX TO MON
43 44
MUTE
OL
ST RTN FX RTN
dB dB
10 10
5 5
U U
5 5
45 46
10 10
20 20
30 30
40 40
50 50
60 60
O O O O

35. BREAK SWITCH

This important "take-a-break" switch quickly mutes
all the microphones and line-level inputs when the band
is between sets. This will prevent protestors or rogue
karaoke singers from storming the stage at the interval.
The monitor send [13] and FX send [14] are not af-
fected. Check this switch fi rst, if you are having trouble
with no sound in your system.
You can still play the stereo RCA tape inputs [18] in
the main stereo mix, and play audio coming in from your
computer via the USB inputs. For example, you could
play a soothing CD while the band is off stage.
22
ProFX8 and ProFX12
32
15
10
5
0
33
5
10
15
1K 2K 4K 8K
39
EQ IN
BYPASS
34
USB
U
40
+20
O O
INPUT LEVEL
35
41
51
USB THRU
(MUTES ALL CHANNELS)
U
42 36
+15
MAX
O O
PHONES
MON
dB dB
10 10
5 5
U U
5 5
47 48
10 10
20 20
30 30
40 40
50 50
60 60
O O O O

36. TAPE LEVEL

This allows you to control the input level of signals
48V
entering the tape inputs. It is conveniently close to the
PHANTOM break switch [35] so you can quickly mute all channels
POWER
and then bring up your background music when the
band is taking a break.
POWER
MAIN
37. STEREO GRAPHIC EQ
METERS
0dB=0dBu
This 7-band graphic equalizer adjusts the main mix
OL
15
output. It affects the line-level outputs [4, 15], but not
10
the tape outputs [19], headphones [17], or the USB
6
3
output [5]. This EQ can be used for the monitor mix in-
0
stead of the main mix, if the main mix/mon switch [38]
2
4
is engaged. It can also be quickly bypassed using the EQ
7
10 in/bypass switch [39].
20
30
Each slider allows you to adjust the level of its
L R
frequency band, with up to 15 dB of boost or cut, and
no change in level at the center (0 dB) position. The
frequency bands are: 125, 250, 500, 1k, 2k, 4k, and 8kHz.
BREAK
U
The EQ section comes before the main fader [48],
and meters [34]. As with the channel EQ, just take it
easy. There is a large amount of adjustment, and if you
+20
O O
TAPE LEVEL
are not careful, you can upset the delicate balance of
MAIN
nature. Although it may not seem cool to actually turn
down controls, with EQ it is often your best option. Turn
down the offending frequency range, rather than boost
the wanted range. You can use it to reduce the level of
some frequency bands where feedback occurs.

38. MAIN MIX/MON

This switch allows you to choose if the stereo graphic
EQ [37] is used for the stereo left and right main mix,
or if it is used for the monitors. For example, there
maybe times when the graphic EQ can be used wisely
in the monitor mix to reduce feedback in the monitors
from nearby microphones.

39. EQ IN/BYPASS

This switch allows you to quickly engage or disen-
gage the stereo graphic EQ. This can be used for quick
checks of your EQ settings, or to shorten the signal path
if you do not need to use the EQ.

40. USB INPUT LEVEL

This control lets you adjust the signal level of the two
channels coming in from your computer, via the USB
port, relative to the mix of the other channels. Adjust
it carefully to achieve the desired mix with the other
channels.
The USB input from your audio software such as
Tracktion, could be individual instrument tracks, a mix
of tracks, or processed tracks.