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Mackie 1220I User Manual

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Quick Start Guide   
9
Line-level Sources and Guitars
Connect your line-level sources to the 1/4" TRS line 
input connectors. Channels 1-4 have mono line inputs, 
and channels 5-12 are stereo. Each line input can    
accept TRS balanced or TS unbalanced sources.
Line-level sources include keyboards, drum machines, 
electronic drum kits, CD players, iPod
®
 docks, guitar 
preamp outputs and so on.
If you have a mono source and the mono channels are 
already in use, plug it into the left input (labeled left/
mono) of the stereo channels, and the signal will appear 
equally on the left and right of the main mix.
If you have a stereo source and want to use channels 
1 and 2 for example, plug the left side into channel 1, 
and set the pan control fully-left. Plug the right side into 
channel 2 and set the pan control fully-right.
LINE/HI-Z
Engage this switch if you want to connect guitars 
directly to the 1/4" line inputs of channels 1 or 2.
For line-level sources, disengage this switch.
To connect guitars to other channels, you will need a 
DI box, or they will not sound good, particularly the high 
frequency response. This applies to most mixers and 
channels in general, unless they have a hi-z switch.
LOW CUT
Channels 1-4 have a low-cut switch that cuts bass 
frequencies below 75 Hz. The low cut switch affects the 
line and mic inputs.  
EQUALIZATION
Mono channels 1-4 have a 3-band EQ, with shelving-
low, peaking-mid, and shelving-high controls. The mid 
frequency is adjustable from 100 Hz to 8 kHz.
Stereo channels 5-12 have a stereo 3-band EQ with 
shelving-low, peaking-mid, and shelving-high.
These EQ options allow a lot of adjustment to your 
line-level sources and guitars. Apply EQ wisely and   
carefully, like makeup. (Too much and things can turn 
ugly.)
TAPE IN and TAPE OUT
Use these RCA unbalanced stereo inputs to connect 
the line-level outputs from sources such as tape decks, 
CD/DVD players and iPod
®
 docks. Engage the tape 
switch to listen in your control room or phones. Engage 
"assign to main mix" to add the sounds to the main mix. 
For example, you can play intermission music, or listen 
to rare reference material of your band getting it right.
The tape output is a copy of the main mix (post 
fader), suitable for analog recording, sending to the 
inputs of an external amplifi er, or sound card etc.
SETTING THE LINE INPUT GAIN
The gain controls allow you to set your input signals 
to an optimum level: not so hot that the mixer is  
overloaded, and not so low that the signal is lost in 
noise. For a signal entering the TRS 1/4" line inputs, 
the adjustment range is -20 dB to +40 dB for channels 
1-4, and -20 dB to +20 dB for channels 5-12. Use the  
following procedure for setting the gain just right: 
1.  Press the solo switch at the bottom of the  
channel your source is connected to. The rude 
solo light will fl ash to remind you that the 
source playing in the control room,  
headphones, and the right main meter is the 
soloed channel.
2.  Play your source at typical loudness levels.
3.  Adjust the channel gain control until the right 
main meter level is hovering around the 0 dB  
mark (labeled "level set").
4.  Now the gain is set correctly, disengage solo.
5.  During a performance, if you notice that the 
OL (overload) LED next to the channel fader 
turns on, carefully decrease the gain until OL 
no longer comes on.
dB
30
20
10
40
50
5
5
U
60
10
O
O
10
dB
30
20
10
40
50
5
5
U
60
O
O
ALT 3/4
10
dB
30
20
10
40
50
5
5
U
60
O
O
ALT 3/4
10
dB
30
20
10
40
50
5
5
U
60
O
O
ALT 3/4
10
dB
30
20
10
40
50
5
5
U
60
O
O
ALT 3/4
10
dB
30
20
10
40
50
5
5
U
60
O
O
ALT 3/4
10
dB
30
20
10
40
50
5
5
U
60
O
O
ALT 3/4
10
dB
30
20
10
40
50
5
5
U
60
O
O
ALT 3/4
10
dB
30
20
10
40
50
5
5
U
60
O
O
ALT 3/4
OL
- 
20
OL
- 
20
OL
- 
20
OL
- 
20
OL
- 
20
OL
- 
20
OL
- 
20
OL
- 
20
SOLO
SOLO
SOLO
SOLO
SOLO
SOLO
SOLO
SOLO
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
48V
48V
48V
48V
U
+
15
-
15
U
+
15
-
15
ON
YX MIC PRE
 
TALKBACK
MAIN MIX
TALKBACK
PRE
POST
HI-Z
LINE
PREMIUM ANALOG MIXER 
w/ PERKINS EQ & FIREWIRE 
TAPE 
MAIN OUT
IN
OUT
L
R
BAL/UNBAL
BAL/UNBAL
ALT 3-4 OUT
BAL/UNBAL
CTRL - RM OUT
AUX
1-2
PHONES
DESTINATION
LEVEL
O
O
MAX
 SEND
PRE
POST
 SEND
PRE
POST
 SEND
EQ
MID
2.5kHz
HIGH
12kHz
PRE
POST
SEND
L
L
L
L
R
R
R
R
 SEND
INPUT
FW 1-2
LINE
(MONO)
(MONO)
(MONO)
(MONO)
R/4
L/3
L
R
L
R
POWER
MIC
1
2
75Hz
18dB/OCT
3
75Hz
18dB/OCT
4
ON
YX MIC PRE
 
PRE
POST
HI-Z
LINE
 SEND
ON
YX MIC PRE
 
PRE
POST
 SEND
ON
YX MIC PRE
 
GAIN
GAIN
GAIN
GAIN
+
40dB
U
-
20dB
U
20
30
40
60
+
40dB
U
-
20dB
U
20
30
40
60
+
40dB
U
-
20dB
U
20
30
40
60
+
40dB
U
-
20dB
U
20
30
40
60
U
+15
-15
U
+15
-15
U
+15
-15
U
+15
-15
EQ
MID
2.5kHz
LOW
80Hz
HIGH
12kHz
EQ
MID
2.5kHz
LOW
80Hz
HIGH
12kHz
MID
2.5kHz
LOW
80Hz
HIGH
12kHz
PRE
POST
 SEND
1k
100
8k
HIGH
12kHz
U
+
15
-
15
LOW
80Hz
EQ
AUX
2
1
L
R
PAN
1
LINE
2
LINE
4
LINE
3
LINE
BAL/UNBAL
BAL/UNBAL
BAL/UNBAL
BAL/UNBAL
BAL/UNBAL
BAL/UNBAL
BAL/UNBAL
BAL/UNBAL
GAIN
GAIN
GAIN
GAIN
+
20dB
-
20dB
U
+
20dB
-
20dB
U
U
+15
-15
U
+15
-15
U
+15
-15
+
20dB
-
20dB
U
U
+15
-15
U
+15
-15
U
+15
-15
+
20dB
-
20dB
U
AUX MASTER
2
1
SEND
RETURN
2
1
CTRL ROOM/PHONES
SOURCE
PHONES
CONTROL
ROOM
RUDE
SOLO
20
15
10
6
3
0
2
4
7
10
20
30
L
R
0dB=0dBu
LEVEL
SET
CLIP
PRE
POST
PRE
POST
RTN TO
AUX1
MAIN MIX
ALT 3-4
TAPE
FW 1-2
ASSIGN TO
MAIN MIX
MAX
O
O
MAX
O
O
+
15
O
O
+
15
O
O
+
10
O
O
+
10
O
O
MAX
O
O
MAX
O
O
U
+15
-15
U
+15
-15
LOW
80Hz
AUX
2
1
L
R
PAN
MAX
O
O
MAX
O
O
2
3
4
7-8
5-6
AUX
2
1
L
R
PAN
MAX
O
O
MAX
O
O
AUX
2
1
L
R
PAN
MAX
O
O
MAX
O
O
AUX
2
1
L
R
PAN
MAX
O
O
MAX
O
O
9-10
11-12
LINE IN 9-10
LINE IN 11-12
LINE IN 7-8
LINE IN 5-6
MID
FREQ
U
+
15
-
15
U
+
15
-
15
1k
100
8k
HIGH
12kHz
U
+
15
-
15
LOW
80Hz
EQ
AUX
2
1
L
R
PAN
MAX
O
O
MAX
O
O
MID
FREQ
U
+
15
-
15
U
+
15
-
15
1k
100
8k
HIGH
12kHz
U
+
15
-
15
LOW
80Hz
EQ
AUX
2
1
L
R
PAN
MAX
O
O
MAX
O
O
MID
FREQ
U
+
15
-
15
U
+
15
-
15
1k
100
8k
HIGH
12kHz
U
+
15
-
15
LOW
80Hz
EQ
AUX
2
1
L
R
PAN
MAX
O
O
MAX
O
O
MID
FREQ
1
Mono 
Line
Inputs
Low Cut
EQ
Gain
Level 
Set
Solo
Tape In/Out
Stereo Line Inputs
Tape
Hi-z