KNOW-HOW
E37
ECM-302B/WS
PA-100ANC
VCA-202RN
VCA-202
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KNOW-HOW: Remote Volume Control
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PA Technology 2014
The Role of Insert Jacks
Time and againitis necessary to insert additional units like equalizers into a signal way. This
is not a problem with systems set up separately with individual mixers and power amplifiers.
In this case, the signal cablesare simply connected to the units. This is different with compact
full amplifiers, as theyare customary for PA applications. In this case, the separation is done
by special jacks. With these combined jacks, it is possible to separate the preamplifier with the
inputs (PRE OUT) from the mere power amplifier (AMP IN). The illustration shows the outputs
by example of the PA-1120 amplifier. Due to the ability to separate, it is now possible to insert
additional units into the signal way.
Two examples of such additional units and their features are shown below.
Automatic Volume Control with PA-100ANC
By using this ambient noise controller, it is possible to achieve a signal
volume depending on the ambient noise. To put it more simple, the
louder the surrounding, the more signal is fed to the speakers.
In practical application
it is possibl
e, e.g. to match the volume of the
background music in a restaurant automatically to the noise level of
the rooms. This adjustment is usually slightly delayed and attenuated,
so that shortnoise peaks will not have any effect on the volume con-
trol.
A microphone is additionally required for the PA-100ANC.
Remote Volume Control with VCA-202
The remote volume control is a further requirement which often has to
be met. This is always the case, if the system is not set up at a location
where staff may be nearby. For this purpose, previous solutions includ-
ed the adjustment of the speaker outputs. With the VCA-202 and
VCA-202RN, the amplifier output power can now easily be adjusted
remotely. The VCA-202 is also inserted between preamplifier and
power amplifier. This could be a compact PA amplifier, a mixer with
separate power amplifier or also a CD player and a power amplifier.
A basic cable withaminimum of 3 wires connects the control unit and
the VCA-202.Because this cable does not carry an AF signal, shield-
ingisnot compulsory. If bothinputs of the VCA-202 are used, the vol-
ume adjustments can either be done together via one control or sepa-
rately via two controls.
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