Formula Sound AVC2, User Manual

I

NSTALLATION

The unit should normally be installed in the signal chain either between the mixer or pre amp and the
amplifiers, or in larger systems the mixer/ preamp and the electronic crossover.

The unit should ideally be mounted where the operator can see the indicator leds on the front panel or
alternatively a remote indicator could be installed (see auxiliary connections section)

Connections are via XLR connectors for the audio and 2 X 4 way connectors for auxiliary connections.

A tamper proof cover is available which can be sealed.  This cover prevents the connectors
from being disconnected and is often a requirement when the unit is installed as a noise
controlling device specified in a licencing application .

The unit features balanced inputs and outputs which are self compensating.  Either side may be tied
to the screen for unbalanced operation without loss of level or performance. (N.B. For unbalanced
operation the negative output should be tied to the screen and not left single ended.  An unbalanced
connection between positive and screen with no connection to negative will result in a loss of signal
level).

When wiring to balanced circuits for stereo operation both left and right channels should be identical
to maintain phase.

To avoid ground loop problems, the audio common (cable screens) in this equipment is NOT con-
nected to mains earth within the unit.  The mains lead earth connection is only connected to the case
and this must always be connected to MAINS EARTH.

As supplied the unit will be detecting the incoming signal to control the output level.

AUXILIARY CONNECTIONS

2 X 4 way connectors are provided for the auxiliary connections.  The connectors are labelled 1,2,3,4
for the first connector and 5,6,7,8 for the second connector. The mating halves for these connectors
are supplied with each unit.
The unit is supplied with a link  which is fitted between pins 1 and 2.  This is the security link and these
two terminals need to be joined for the unit to operate.  Removing the link will mute the unit.

Pins  3 and 4 when joined allow the unit to be dimmed by 20dB.  When the connection is removed the
unit will fade back to the previous level.

Pins 5 and 6 are provided to allow a warning indicator to be connected to the system.  An led indicator
may be connected directly to pins 5 and 6 observing polarity to avoid damaging the led.  Alternatively
a conventional effects lighting, switching  pack may be connected that is compatible with a 10V D.C.
input to provide larger warning indication. This output provides a current limited 10V D.C. signal  3dB
before the unit starts to control volume levels.

Pins 7 and 8 are provided for switching between two output levels.  This function may be controlled by
a time switch if required. (Time switch not supplied).

All the auxiliary connections are low voltage low current connections,

When connected to external switches fire alarms etc. they must be totally

isolated and fully floating from any other electrical circuit.

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