Ecler MPA 4-400R - Manual (Page 12)

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4.3. Remote control
The MPA R rear panel offers one terminal per amplifier to remotely control the volume, using the
built-in “VCA” circuit.
The combined usage of the rotary potentiometers
located at the front panel and the remote VCA control
determines the final value of the signal’s attenuation for each
input channel. Therefore, a certain value can be fixed for the
signal attenuation using the rotary so that the remote control
via VCA will not exceed this value and viceversa, that is, the
two controls are connected in series.
This functionality can be useful in installations where
users with little experience are in charge of volume adjustment.
4.4. Connection of the VCA control
As already mentioned in the introduction of this manual, the signal attenuation level for each of the
input channels can be set using the following methods:
a) Using a remote potentiometer with nominal resistance between 10k  and 50k.
b) Using a device that generates a control voltage from 0 to 10V DC.
c) Using remote relays/dry contacts.
NOTE: it is possible to connect a maximum of 16 inputs to one control potentiometer. It is
necessary that the ground terminals of all amplifiers are connected.
The connection cables can be up to 500m long if a section of 0,5mm 2 is used.
Consult the available accessories at your ECLER dealer or at www.ecler.com.
Remember that the VCA circuit is disabled by default. If you need to use it, you have to activate it
using the internal jumpers (see configuration diagram).