6.1.5 Paralleling inputs; Important: If the source is a microphone which re-; quires phantom power (P), select it only at the first- Page 26

Page 26

IQ–AMB-5 / IQ–SMX-6

 Reference Manual

AMB-5 / SMX-6

  IQ Mixer/Multiplexer

+

–

+

–

+

–

+

–

MAIN

AUDIO
OUT

2

AUDIO
OUT

1

BUS

STACK
IN

MAIN

BUS

STACK
IN

3-pin output connector

+

–

+

–

+

–

+

–

MAIN

AUDIO
OUT

2

AUDIO
OUT

1

BUS

STACK
IN

MAIN

BUS

STACK
IN

2-conductor shielded cable

Phone (RCA) plug

First

Unit

Connect ground (   ) from
output to phone plug shield

Second

Unit

(–) No connection

SMX-6

SMX-6

SMX-6

SMX-6

PARALLELED

INPUTS

6 INPUTS

8
OUTPUTS

* 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.

+

–

AUDIO
IN

2

AUDIO
IN

1

L

M

P

0

-5

-10

-12

5

10

15

21

ADD 25
FOR MIC

L

M

P

0

-5

-10

-12

5

10

15

21

ADD 25
FOR MIC

0

+

–

+

–

AUDIO
IN

2

AUDIO
IN

1

L

M

P

0

-5

-10

-12

5

10

15

21

ADD 25
FOR MIC

L

M

P

0

-5

-10

-12

5

10

15

21

ADD 25
FOR MIC

0

+

–

Do NOT tie ground terminals

of parallel inputs together

To signal

source

First

Unit

Second

Unit

2-conductor shielded cable

Connect shield to ground

terminal of input ONLY

No
phantom
power

SMX-6

SMX-6

SMX-6

SMX-6

SMX-6

SMX-6

SMX-6

SMX-6

MAIN

OUT

STACK
IN

PARALLELED

INPUTS

6x8

12 INPUTS

8
OUTPUTS

STACKED
OUTPUTS

6x8

The correct way to wire stacked units is shown below:

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.

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).*

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:

Figure 6.10 Stacking the Outputs of Multiple Units

Figure 6.11 A 6x8 Mixer Using 4 Mixer/Multiplexers

Figure 6.12 Paralleling the Inputs of Multiple Units

Figure 6.13 A 12x8 Mixer Using 8 Mixer/Multiplexers