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16 Onyx 1220i
Channel Controls
The vertical channel strips look very similar, and have
only a few differences between them. Each
channel 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 fi lters 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.
10
dB
30
20
10
40
50
5
5
U
60
OO
ALT 3/4
10
dB
30
20
10
40
50
5
5
U
60
OO
ALT 3/4
10
dB
30
20
10
40
50
5
5
U
60
OO
ALT 3/4
10
dB
30
20
10
40
50
5
5
U
60
OO
ALT 3/4
10
dB
30
20
10
40
50
5
5
U
60
OO
ALT 3/4
OL
-
20
OL
-
20
OL
-
20
OL
-
20
OL
-
20
SOLO SOLO SOLO SOLO SOLO
MUTE MUTE MUTE MUTE MUTE
48V 48V 48V 48V
U
+15
-15
U
+15
-15
O
N
Y
X
M
I
C
P
R
E
PRE
POST
HI
-
Z
LINE
BAL/UNBAL
CTRL - RM
O
SEND
EQ
MID
2.5kHz
HIGH
12kHz
PRE
POST
SEND
L
R
(MONO)
L
12
75Hz
18dB/OCT
3
75Hz
18dB/OCT
4
O
N
Y
X
M
I
C
P
R
E
PRE
POST
HI
-
Z
LINE
SEND
O
N
Y
X
M
I
C
P
R
E
PRE
POST
SEND
O
N
Y
X
M
I
C
P
R
E
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
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/UNBALBAL/UNBAL BAL/UNBAL BAL/UNBAL BAL/UNBAL
GAIN
+20dB-20dB
U
MAX
OO
MAX
OO
U
+15
-15
LOW
80Hz
AUX
2
1
L
R
PAN
MAX
OO
MAX
OO
2 3 4 5-6
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
OO
MAX
OO
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
OO
MAX
OO
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
OO
MAX
OO
MID
FREQ
1