Correct way to wire stacked units is shown below

AMB-5 /SMX-6IQ Mixer/Multiplexer

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

+ – + – + –

3-pin output connector

(–) No connection

2-conductor shielded cable

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
Unit	IN	-5	10	IN	-5	10
	2	-10	15	1	-10	15
	2	-12	21	1	-12	21
				+	–
			M L P			M L P

+ –

Do NOT tie ground terminals of parallel inputs together

2-conductor shielded cable

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 6.11-12. 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

8 OUTPUTS

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.

Second	AUDIO		ADD 25	AUDIO		ADD 25
Unit	IN	0	5 FOR MIC	IN	0	5 FOR MIC
Unit	IN	-5	10	IN	-5	10
	2	-10	15	1	-10	15
	2	-12	21	1	-12	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

SMX-6SMX-6

PARALLELED

INPUTS

SMX-6SMX-6

8 OUTPUTS

SMX-6SMX-6

6x8	STACKED	6x8
	OUTPUTS

Figure 6.13 A 12x8 Mixer Using 8 Mixer/Multiplexers

Page 26

IQ–AMB-5 / IQ–SMX-6 Reference Manual

IQAMB-5, IQSMX-6 specifications

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