Cloud Z8II Manual de instalação e do utilizador - Página 10

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& Z8

: Installation and User Guide

Controlling the music functions using external DC control

The Cloud Z4 and Z8 can be used as part of an automated sound system by controlling the

music level and music source by an external 0-10V DC voltage. The 3-pole connector

normally used to terminate the RSL-6 control plate can be used to feed two separate control

voltages into the mixer on a zone by zone basis. Pin 1 is a ground (0V) termination common

to both control voltages; this should be connected to the technical ground (0V) of the voltage

source, Pin 2 is the control voltage input for the music level and pin 3 is used to control the

music source selection.

Control of music level

A maximum gain reduction of 60dB can be achieved with a control voltage of +10V; the rate

of attenuation is approximately 165mV per dB. A control voltage of zero realises unity gain

(full volume), however, with no external connection to pin 2, an internal 4k7 resistor

connected to +15V will 'pull up' the control voltage to provide maximum attenuation. The

output impedance of the control voltage source should be low enough to overcome the

influence of this resistor.

Music source selection

Here are the details of the music source select control voltages (pin 3) required to switch the

six line input signals:

With no external connection to pin 3, an internal 15k resistor connected to +15V will 'pull up'

the source select control voltage and the 'off' position will be selected. The output impedance

of the control voltage source should be low enough to overcome the influence of this resistor.

If you would like to fix the music signal to a particular line input, wire a fixed resistor from the

table below between pins 1 & 3 on the remote control connector:

If the control voltage source is not isolated from the power earth, there is a small risk of

creating a 'ground loop' by linking the mixer technical ground (0V) to the ground (0V) of the

equipment providing the control voltages. To minimise this risk of a ground loop occurring,

we suggest that all pieces of equipment be positioned in close proximity and supplied from

the same power outlet.

30/05/03 V8

Off

>+9.0V

Line 1

+7.5V

Line 2

+6.0V

Line 3

+4.5V

Line 4

+3.0V

Line 5

+1.5V

Line 6