Crown MPX-6, SMX-6 Connecting Auxiliary Devices Step, 22 a 12x8 Mixer Using 8 Mixer/Multiplexers

IQ Mixer / Multiplexer Hardware Installation

By using several units and a combination of parallel inputs and stacked outputs, larger mixing configu- rations (12x8, 24x4, etc.) can be created as shown below:

12 INPUTS

MAIN STACK

OUT IN

SMX-6SMX-6

PARALLELED

INPUTS

MPX-6MPX-6

8 OUTPUTS

MPX-6MPX-6

MPX-6MPX-6

6x8 STACKED 6x8

OUTPUTS

Fig. 3.22 A 12x8 Mixer Using 8 Mixer/Multiplexers

3.4 Connecting Auxiliary Devices (Step 4)

Auxiliary devices, external to the IQ System, can be turned on and off using the Aux port on the mixer/ multiplexer. For example, auxiliary cooling for an amplifier equipment rack can be controlled using the Aux port to control a solid state relay which in turn controls a cooling fan. This is shown below in Figure 3.23:

maximum of 16 mA. This is shown below in Figure 3.24.

Notice in Figure 3.24 that the Aux port also has the capability to receive a signal across pins 2 (+) and 1 (ground). It is a high impedance input and in- cludes a pull-down resistor.

+24 V

1.5 K ohm10 V Zener

		AUX
	CONNECTOR
	3	1
+5 V	OUT	GND
		2
	20 K	IN
(LSTTL)	100 K

Fig. 3.24 Internal Auxiliary Circuit

AUX

CONNECTOR

1

3

GND

10 V

2

110 VAC

INPUT

		SOLID
		STATE
		RELAY
+	–	(C 7308-7)

AUXILIARY

EQUIPMENT

Fig. 3.23 Sample Auxiliary System Wiring

The solid state relay shown (Crown part number C 7308-7) can be ordered from Crown.

The Aux port uses a male 3-pin mini XLR connector which is located above the DB25 connector (Figure 2.1). Use a Switchcraft® TA3F cable connector or equivalent to make the connection.

When the Aux port is turned on by the IQ System it provides 10 VDC across pins 3 (+) and 1 (ground). An internal 1500 ohm resistor limits the current to a

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