The correct way to wire stacked units is shown below:
To signal source
First Unit
AUDIO
OUT
2MAIN
+ –
STACK | AUDIO | STACK |
IN | OUT | IN |
BUS | 1 MAIN | BUS |
+ – + – + –
Connect ground () from output to phone plug shield
Phone (RCA) plug
First | AUDIO | ADD 25 | AUDIO | ADD 25 | ||
Unit | IN | 0 | 5 FOR MIC | IN | 0 | 5 FOR MIC |
10 | 10 | |||||
| 2 | 15 | 1 | 15 | ||
| 21 | 21 | ||||
|
|
|
| + | – |
|
|
|
| M L P |
|
| M L P |
+ –
Do NOT tie ground terminals of parallel inputs together
Connect shield to ground terminal of input ONLY
Second | AUDIO | STACK | AUDIO | STACK | |
OUT | IN | OUT | IN | ||
Unit | |||||
2 MAIN |
| 1 MAIN |
| ||
| BUS | BUS |
+ – + – + – + –
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 INPUTS
PARALLELED
INPUTS
8 OUTPUTS
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.
Second | AUDIO | ADD 25 | AUDIO | ADD 25 | ||
Unit | IN | 0 | 5 FOR MIC | IN | 0 | 5 FOR MIC |
10 | 10 | |||||
| 2 | 15 | 1 | 15 | ||
| 21 | 21 | ||||
|
|
|
|
|
| No |
|
|
| M L P |
|
| M L P phantom |
| + | – |
| + | – | power |
|
|
|
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 STACK
OUT IN
PARALLELED
INPUTS
8 OUTPUTS
6x8 | STACKED | 6x8 |
| OUTPUTS |
|
Figure 6.13 A 12x8 Mixer Using 8 Mixer/Multiplexers
Page 26 |