Crown IQAMB-5, IQSMX-6 manual Stack Inputs, Audio Output Section

AMB-5 /SMX-6IQ Mixer/Multiplexer

Each bus output can drive any number of inputs within this impedance range.

AUDIO	STACK
OUT	IN
1 MAIN	BUS

+ – + –

Figure 6.6 Audio Output Section

The main audio outputs are provided for connection with other audio equipment such as power amplifiers. They can also be “stacked” with the outputs of other mixer/multiplexers to increase the number of mixer in- puts For example, two 6x2 IQ–SMX-6s can be stacked to create a 12x2 mixer. This is described in Section 6.1.4

The bus outputs are turned on or off by relays and func- tion like the AUX “send” outputs on a conventional mix- ing console. They are switched on or off by the IQ System. This special design allows many bus outputs to be connected to a common audio bus in a multiple- zone network (like a large airport paging system). Be- cause the bus outputs are controlled by the IQ System, they can be kept off until they are actually used, pre- venting too many of them from being on at the same time and loading down a common audio bus network.

The versatile bus outputs can be used for any audio system where switchable outputs are desired, such as switchable recording outputs.

Figure 6.7 Balanced Audio Output Connections

Both main and bus outputs are wired the same way. Balanced output wiring is shown in Figure 6.7.

Notice that the shield is not connected to the output ground terminal if the load is connected to AC ground. This prevents unwanted ground loops. Unbalanced output wiring is shown next.

Figure 6.8 Unbalanced Audio Output Connections

6.1.4 Stack Inputs

the “stack in” jacks (Figure 6.6) enable the audio inputs to be increased by stacking 2, 3 or more mixer/multi- plexers to create a 12x2, 18x2 or wider mixer. Use 2- conductor shielded cable to route the signal from the main output of one unit to the stack input (RCA phono jack) of the second unit. Use the outputs of the last unit in the stack for connection to amplifiers or other exter- nal audio equipment.*

12 INPUTS

MAIN STACK

OUT IN

SMX-6	SMX-6	2
		OUTPUTS

STACKED

OUTPUTS

Figure 6.9 A 12x2 Mixer Using 2 Mixer/Multiplexers

Stacking mixer/multiplexers can create an almost un- limited number of inputs; however, there will still only be two main and two auxiliary bus outputs for connection to other equipment. See Section 6.1.5 to find output how to increase the number of outputs.

*The level of each signal on the stacked ouput bus is controlled by the unit having the signal as an input.

IQ–AMB-5 / IQ–SMX-6 Reference Manual Page 25