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The correct way to wire stacked units is shown below:
AUDIO
STACK
First
IN
OUT
Unit
2
MAIN
+
–
+
AUDIO
STACK
Second
IN
OUT
Unit
2
MAIN
+
–
+
Figure 6.10 Stacking the Outputs of Multiple Units
6.1.5 Paralleling inputs
When using more than one unit, the inputs may be
wired in parallel to increase the number of outputs that
a source can drive. This is shown in Figures 6.11-12.
For example, the audio signal in Figure 6.12 which
feeds Input 1 is available to the outputs of both units,
creating a 6x4 mixer.
6 INPUTS
SMX-6
PARALLELED
INPUTS
SMX-6
SMX-6
SMX-6
Figure 6.11 A 6x8 Mixer Using 4 Mixer/Multiplexers
Important: If the source is a microphone which re-
quires phantom power (P), select it only at the first
input. Switch all other parallel inputs to mic (M).*
* When mixer inputs are paralleled, the total input impedance will drop by 1/
N where N is the number of inputs to be connected. Depending on the signal
source, this may place a limit on the number of possible outputs.
Page 26
AUDIO
STACK
IN
OUT
1
BUS
MAIN
BUS
–
+
–
+
–
3-pin output connector
(–) No connection
2-conductor shielded cable
Connect ground ( ) from
output to phone plug shield
Phone (RCA) plug
AUDIO
STACK
IN
OUT
1
BUS
MAIN
BUS
–
+
–
+
–
8
OUTPUTS
AMB-5 / SMX-6 IQ Mixer/Multiplexer
To signal
source
First
AUDIO
ADD 25
0
5
FOR MIC
IN
Unit
-5
10
2
-10
15
-12
21
M
+
–
Do NOT tie ground terminals
of parallel inputs together
2-conductor shielded cable
Connect shield to ground
terminal of input ONLY
Second
AUDIO
ADD 25
0
5
IN
FOR MIC
Unit
-5
10
2
-10
15
-12
21
M
+
–
Figure 6.12 Paralleling the Inputs of Multiple Units
By using several units and a combination of parallel
inputs and stacked outputs, larger mixing configura-
tions (12x8, 24x4, etc.) can be created as shown be-
low:
12 INPUTS
MAIN
OUT
SMX-6
PARALLELED
INPUTS
SMX-6
SMX-6
SMX-6
STACKED
6x8
OUTPUTS
Figure 6.13 A 12x8 Mixer Using 8 Mixer/Multiplexers
IQ–AMB-5 / IQ–SMX-6 Reference Manual
AUDIO
ADD 25
0
0
5
FOR MIC
IN
-5
10
1
-10
15
-12
21
+
–
L
P
M
L
P
AUDIO
ADD 25
0
0
5
IN
FOR MIC
-5
10
1
-10
15
-12
21
No
phantom
L
P
M
L
P
power
+
–
STACK
IN
SMX-6
SMX-6
8
OUTPUTS
SMX-6
SMX-6
6x8
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