Mackie 1220I User Manual

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   Onyx 1220i
Tape is the stereo signal coming in from the tape in 
[15] RCA jacks. FireWire is a 2-track feed coming in 
through the FireWire [3] connection from your 
computer. Alt 3-4 is the additional stereo mix bus 
formed when any channel is muted with the  
mute/alt 3-4 switch [31]. 
Selections made here deliver stereo signals to the 
control room, phones, and meters. With no switches or 
main mix [35] engaged, there will be no signal at these 
outputs and no meter indication.
The exception is the solo function. Regardless of the 
source matrix selection here, engaging a channel’s solo 
switch will replace that selection with the solo signal, 
sent to the control room, phones, and the right meter.
37. ASSIGN TO MAIN MIX
Let’s say you’re doing a live show: "You're doing a live 
show." Intermission is nearing and you want to play a 
soothing CD for the crowd to prevent them from  
becoming antsy. Simply engage this switch and your 
source matrix selection, after going through the control 
room level control, will feed into the main mix, just as if 
it were another stereo channel.
What if you have a playlist of MP3 fi les on your    
computer you want to play during the break? Engage 
this switch and the FireWire switch [36] to play your 
MP3s directly from your computer, through the source 
matrix, and into the main mix.
Another handy use for this switch is to enable the  
alt 3-4 mix to become a submix of the main mix, using 
the control room level control.
Side effects to engaging this switch:
1.  It will also feed any soloed channels into the 
main mix, which may be the last thing you 
want. 
2.  If you have main mix as your source matrix 
selection and then engage this switch, the main 
mix lines to the source matrix will be  
disconnected from the control room and phones 
outputs, to prevent feedback.
3.  If you have tape as your source matrix  
selection, and then engage this switch, it can 
create a feedback path between tape in and 
tape out. Make sure your tape deck is not in 
record, record-pause, or input monitor mode 
when you engage these switches, or make sure 
the control room knob [38] is turned all the 
way down.
38. CONTROL ROOM Knob
This controls the volume at the control room outputs, 
from off to maximum gain (+10 dB). It also controls the 
level of the control room signal going to the main outs 
when assign to main mix [37] is selected.
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
MAIN MIX
ALT 3-4
TAPE
FW 1-2
ASSIGN TO
MAIN MIX
MAX
O
O
MAX
O
O
Control Room/Phones and 
Meters
Typically, the engineer sends the main mix to an   
audience (for a live show) or to a mixdown deck (if 
recording). But what if the engineer needs to hear 
something other than the main mix in the control room 
or headphones? With the Onyx 1220i, the engineer has 
several choices of what to listen to. This is one of those 
tricky parts, so buckle up.
35. MAIN MIX
Press this switch in to listen to the main mix in your 
control room and headphones, and to check the main 
mix levels in the meters. In addition to the main mix, 
you can listen to any combination of tape, FW 1-2 and 
alt 3-4, depending on which of these switches [36] is 
engaged.
If the assign to main mix switch [37] is 
engaged, you cannot hear the main mix in the 
control room or headphones, or see its level 
on the meters. This is to prevent feedback caused by 
sending the main mix to the main mix.
36. TAPE, FW 1-2, ALT 3-4
Using these source switches, you can choose to listen 
to any combination of tape, FireWire, and alt 3-4 in the 
control room and headphones, in addition to the main 
mix if its source switch [35] is engaged. 
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37
38
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