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Peripheral Connections
5.3 A 4478/9 LOCAL MICROPHONE/LINE INPUT WALL PLATES
The A 4478/9 connects to the A 4491/2 audio source selector plates to provide the facility to access a local microphone or
audio source in the same zone. Examples might include a handheld microphone, laptop or MP3 player. This audio signal is
fed into the A 4490 wallplate where it overrides the wallplates current audio source selection from the A 4480 via a VOX
circuit.
This new status is displayed on the main screen of the A 4480 by an “*” in the local input brackets.
A 4478/9 Connections
1
Microphone ground connection.
2
Microphpone negative connection.
3
Microphone positive connection.
5.3.1 Features
• Microphone XLR input
• Dual RCA input
• 3.5mm jack input. Note: The RCA and 3.5mm jack input are mixed together internally.
5.3.2 Connections
Audio is routed back to the A 4491/2 zone wallplates by connection of twin shielded audio cable (such as Altronics W
3028) to the euroblocks on the rear of both wall plates.
A 4478
5.3.3 Connecting the A 4478/79 local input wall
plates to the A 4491/92 Zone wall plates.
Each A 4491/92 remote zone plate can have a
maximum of one A 4478 or A 4479 local input plate
connected, to provide a local audio override of the zone.
Both plates have a five way euro block connector used
for this purpose. It is advisable to use shielded cable for
this connection. NOTE : Only three of the connections are
required as shown in Fig5.3.
1 2 3 4
ON
A 4491
A 4478
Connection Diagram between the A 4491 TFT Wallplate
and the A 4478 Local Input Wallplate
MIC+
MIC-
GND
Fig 5.3
A 4479
