16
Onyx 1220i
Channel Controls
The vertical channel strips look very similar, and
have only a few differences between them. Each chan-
nel works independently, and just controls the signals
plugged into the inputs directly above it.
Here are a few features and differences:
Mono Channels 1-4
• These are mono channels, and their controls
affect either the mono mic input or the mono
line-level input.
• Channel 1 and 2 each have a hi-z switch, so you
can connect guitars directly without the need
for a DI box.
• 48 Volt Phantom Power can be selected for each
mic input.
• High pass filters affects both the mic and line
inputs.
• Gain control adjusts the mic level and line
level.
• The 3-band EQ has shelving high, shelving
low, and peaking mid EQ with adjustable mid
frequency.
Stereo Channels 5-12
• The stereo channels each have two line-level
inputs.
• For mono sources, use the left input only, and
it will appear equally on both sides of the main
mix.
• Gain control adjusts the line level only.
• The 3-band EQ has shelving high, shelving low,
and peaking mid EQ.
• Channel 11 and 12 have a switch to select
FireWire inputs instead of the analog line
inputs.
“U” like Unity gain
Mackie mixers have a “U” symbol on almost every level
control. It stands for “unity gain,” meaning no change in
signal level. The labels on the controls are measured in
decibels (dB), so you’ll know what you’re doing level-
wise if you choose to change a control’s settings.
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
FIREWIRE
L
R
POWER
4
3
CHANNEL INSERT
BAL/UNBAL
1
AUX RETURN
2
2
1
1
( PRE-FADER / PRE EQ TIP SEND / RING RETURN )
BAL/UNBAL
2
MAIN OUT
BALANCED
AUX SEND
L
R
L
R
MAIN OUTPUT
LEVEL
MIC
+
4dB
