MACKIE PPM1012 - Manual (Page 16)

1
PPM101
PPM1012
23. GAIN CONTROL
If you haven’t already, please read the level-setting
procedure on page 3.
The gain knobs adjust the input sen-
sitivity of the mic and line inputs. This
allows signals from the outside world to
be adjusted to optimal internal operat-
ing levels.
If the signal originates through the
XLR jack of a mono channel (1 to 8), there will be 0 dB
of gain with the knob fully down, ramping to 50 dB of
gain fully up.
Through the 1⁄4" input, there is 20 dB of attenuation
fully down and 30 dB of gain fully up (20 dB on ste-
reo channels), with unity gain at 12:00. This 20 dB of
attenuation can be very handy when you are inserting
a very hot signal, or when you want to add a lot of EQ
gain, or both. Without this “virtual pad,” this scenario
might lead to channel clipping and distortion.
Clipping occurs when the peaks of the audio
signal passing through the preamplifier are
too high, and can no longer be amplified in
a linear way. The audio signals reach a point
just below the preamp's supply voltages, and flatten out.
This is rather like a tall pointed volcano suddenly blow-
ing its top, leaving behind a lower flatter top (clipped)
while thousands of tons of molten rock and ashes are
blasted into the earth's atmosphere to cause a kind of
global winter for thousands of years, leading to the dis-
appearance of the dinosaurs and the appearance of jazz
drummers. Only not. Adjust the gain to prevent this.
24. LOW CUT (Channels 1–8 only)
The mono channels each have a low-cut switch, often
referred to as a high-pass filter (all depends on how you
look at it). When engaged, this cuts the bass frequen-
cies below 100 Hz at a rate of 18 dB per octave. The mic
and line inputs of channels 1–8 are affected.
We recommend that you use low-cut on every micro-
phone application except kick drum, bass guitar, or
bassy synth patches. These aside, there isn’t much down
there that you want to hear, and filtering it out makes
the low stuff you do want much more crisp and tasty.
Not only that, but low-cut can help reduce the possibili-
ty of feedback in live situations, and it helps to conserve
amplifier power.
Another way to consider low-cut’s function is that it
actually adds flexibility during live performances. With
the addition of low-cut, you can safely use low equaliza-
tion on vocals. Many times, bass shelving EQ can really
benefit voices. Trouble is, adding low EQ also boosts
stage rumble, mic handling clunks and breath pops
from way-down low. Applying low-cut removes all those
problems, so you can add low EQ without losing a woofer
out the window.
80Hz
LOW
MIC 1 MIC 2 MIC 3 MIC 4 MIC 5 MIC 6 MIC 7 MIC 8
INPUT
(BAL/UNBAL) (BAL/UNBAL) (BAL/UNBAL) (BAL/UNBAL) (BAL/UNBAL) (BAL/UNBAL) (BAL/UNBAL) (BAL/UNBAL)
INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT
GAIN
U
-20
LAMP
12V 0.5A
L
R
FX SEND TAPE
OUT IN
L
MON SEND
FX RTN
(MONO)
MID
FREQ
R L
U
GAIN
MI C GAIN
0 +50
-20dB +30dB
600
1.5k 150
8k 100
OFF MAX
U
GAIN
MI C GAIN
0 +50
-20dB +30dB
U
GAIN
MI C GAIN
0 +50
-20dB +30dB
U
GAIN
MI C GAIN
0 +50
-20dB +30dB
U
GAIN
MI C GAIN
0 +50
-20dB +30dB
U
GAIN
MI C GAIN
0 +50
-20dB +30dB
U
GAIN
MI C GAIN
0 +50
-20dB +30dB
U
GAIN
MI C GAIN
0 +50
-20dB +30dB
1 9/10 11/12 2 3 4 5 6 7 8
SOLO
OL
+10
0
-20
SOLO
OL
+10
0
-20
1 9/10 11/12 2 3 4 5 6 7 8
EQ EQ
OFF MAX OFF MAX OFF MAX OFF MAX OFF MAX
12kHz
HI
LOW CUT
100 Hz
U
+15 -15
U
+15 -15
U
+15 -15
U
+15 -15
+20
12kHz
HI
80Hz
LOW
HI
MID
2.5kHz
LOW
MID
400Hz
U
+15 -15
U
+15 -15
U
+15 -15
U
+15 -15
12kHz
HI
80Hz
LOW
HI
MID
2.5kHz
LOW
MID
400Hz
GAIN
U
-20
PAN
AUX
SEND
EQ
COMP COMP COMP COMP COMP COMP
+20
1
2
L
R
(MONO)
L
R
(MONO)
L
R
(MONO)
1
2
FX RTN
L
R
L
R
M
L
R
M
MON
1
MON
2
FX
1
FX
2
U
+15 O O
U
+15 O O
U
+15 O O
U
+15 O O
-15
U
+15
-15
U
+15
-15
U
+15
80Hz
LOW
MID
FREQ
R L
600
1.5k 150
8k 100
EQ
12kHz
HI
PAN
AUX
SEND
MON
1
MON
2
FX
1
FX
2
U
+15 O O
U
+15 O O
U
+15 O O
U
+15 O O
-15
U
+15
-15
U
+15
-15
U
+15
80Hz
LOW
MID
FREQ
R L
600
1.5k 150
8k 100
EQ
12kHz
HI
PAN
AUX
SEND
MON
1
MON
2
FX
1
FX
2
U
+15 O O
U
+15 O O
U
+15 O O
U
+15 O O
-15
U
+15
-15
U
+15
-15
U
+15
80Hz
LOW
MID
FREQ
R L
600
1.5k 150
8k 100
EQ
12kHz
HI
PAN
AUX
SEND
MON
1
MON
2
FX
1
FX
2
U
+15 O O
U
+15 O O
U
+15 O O
U
+15 O O
-15
U
+15
-15
U
+15
-15
U
+15
80Hz
LOW
MID
FREQ
R L
600
1.5k 150
8k 100
EQ
12kHz
HI
PAN
AUX
SEND
MON
1
MON
2
FX
1
FX
2
U
+15 O O
U
+15 O O
U
+15 O O
U
+15 O O
-15
U
+15
-15
U
+15
-15
U
+15
80Hz
LOW
MID
FREQ
R L
600
1.5k 150
8k 100
EQ
12kHz
HI
PAN
AUX
SEND
MON
1
MON
2
FX
1
FX
2
U
+15 O O
U
+15 O O
U
+15 O O
U
+15 O O
-15
U
+15
-15
U
+15
-15
U
+15
80Hz
LOW
MID
FREQ
R L
600
1.5k 150
8k 100
EQ
12kHz
HI
PAN
AUX
SEND
MON
1
MON
2
FX
1
FX
2
U
+15 O O
U
+15 O O
U
+15 O O
U
+15 O O
-15
U
+15
-15
U
+15
-15
U
+15
80Hz
LOW
MID
FREQ
R L
600
1.5k 150
8k 100
EQ
12kHz
HI
PAN
AUX
SEND
MON
1
MON
2
FX
1
FX
2
U
+15 O O
U
+15 O O
U
+15 O O
U
+15 O O
R L
PAN
AUX
SEND
MON
1
MON
2
FX
1
FX
2
U
+15 O O
U
+15 O O
U
+15 O O
U
+15 O O
R L
PAN
AUX
SEND
MON
1
FX
MON
2
FX
1
FX
2
U
+15 O O
U
+15 O O
U
+15 O O
U
+15 O O
-15
U
+15
-15
U
+15
-15
U
+15
1 FX 2
9 1 2 10 / INPUT 11 12 / MAIN OUT
MAIN INSERT
TAP
DELAY
INT FX
MUTE
TAP
DELAY
INT FX
MUTE
TAP TO EDIT
01 PLATE REVERB
02 VOCAL PLATE
03 WARM ROOM
04 BRIGHT ROOM
13 CHORUS
14 CHORUS + REVERB
15 DOUBLER
16 TAPE SLAP
05 WARM LOUNGE
06 SMALL STAGE
07 WARM THEATER
08 BRIGHT STAGE
09 WARM HALL
10 CONCERT HALL
11 CATHEDRAL
12 GATED REVERB
17 DLY 1 BRIGHT (350ms)
18 DLY 1 WARM (300ms)
19 DLY 2 BRIGHT (250ms)
20 DLY 2 WARM (200ms)
21 DLY 3 BRIGHT (175ms)
22 DLY 3 WARM (150ms)
23 CHORUS + DLY (300ms)
24 REVERB + DLY (200ms)
15
15
10
10
5
5
0
15
15
10
10
5
5
0
16K 8K 4K 2K 1K 500 250 125 63
HI-Z HI-Z
OL
4
6
3
10
15
7
10
20
30
0
2
U
+20 O O TAPE IN
BREAK
MUTES
CH 1-12
U
+15 O O
U
+15 O O
TO MON 1 TO MON 2
FX 1 FX 1
MONO OUT
LPF
O O MAX
75Hz
100 180
120
200Hz
0dB = 0dBu
LEVEL
SET
RUDE
SOLO
MAIN
MON 2
EQ ASSIGN
MAIN
METERS
R L
PHANTOM POWER
MAIN EQUALIZER
MON 1 EQUALIZER
15
15
10
10
5
5
0
15
15
10
10
5
5
0
16K 8K 4K 2K 1K 500 250 125 63
SIG/OL SIG/OL
U
+15 O O
SEND MASTER
U
+15 O O
SEND MASTER
LOW CUT
100 Hz
LOW CUT
100 Hz
LOW CUT
100 Hz
LOW CUT
100 Hz
LOW CUT
100 Hz
LOW CUT
100 Hz
LOW CUT
100 Hz
dB
10
O O
5
5
U
dB
30
20
10
O O
40
50
5
5
U
60
SOLO
OL
+10
0
-20
dB
30
20
10
O O
40
50
5
5
U
60
SOLO
OL
+10
0
-20
dB
30
20
10
O O
40
50
5
5
U
60
SOLO
OL
+10
0
-20
dB
30
20
10
O O
40
50
5
5
U
60
SOLO
OL
+10
0
-20
dB
30
20
10
O O
40
50
5
5
U
60
SOLO
OL
+10
0
-20
dB
30
20
10
O O
40
50
5
5
U
60
SOLO
OL
+10
0
-20
dB
30
20
10
O O
40
50
5
5
U
60
SOLO
OL
+10
0
-20
dB
30
20
10
O O
40
50
5
5
U
60
SOLO
OL
+10
0
-20
dB
30
20
10
O O
40
50
5
5
U
60
SOLO
dB
30
20
10
O O
40
50
5
5
U
60
SOLO
dB
30
20
10
O O
40
50
5
5
U
60
SOLO
dB
30
20
10
O O
40
50
5
5
U
60
SOLO
dB
30
20
10
O O
40
50
5
5
U
60
dB
30
20
10
O O
40
50
5
5
U
60
FX RTN 1 FX RTN 2 MON 1 MON 2 MAIN
FOOTSWITCH
TIP: FX1
RING: FX2
PHONES
FX
LEVEL
2 X 800W PROFESSIONAL POWERED MIXER
O O MAX
30
20
40
50
60
10 10 10 10 10 10 10 10 10 10 10 10 10 10 10
(L) (R)
MON 1
MON 2
MAINS
MON 1
STEREO
MAIN
A B
LINE LINE LINE LINE LINE LINE LINE
HI-Z
LINE
HI-Z
POWER AMP
LIMITER
A B
POWER AMP
MODE
POWER
2 X 800W PROFESSIONAL POWERED MIXER
CAUTION
HOT SURFACE,
AVOID CONTACT REVISION
SERIAL NUMBER
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR
MOISTURE. DO NOT REMOVE COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
B
SPEAKER OUT
A
SPEAKER OUT
OUTPUT POWER: @ 4 OHMS,
800 WATTS PEAK PER CH
MINIMUM LOAD: 4 OHMS PER CHANNEL
PIN
1+
1
PIN
1+
1
R
U
GAIN
MI
C GAIN
0 +50
-20dB +30dB
23
24
27
25
28
29
32
33
34
35
36
37
38
40
39
41