Protech Audio 65306 - Manual

Protech Audio Corp., 192 Cedar River Road, Indian Lake, New York, 12842 Phone 518-648-6410 Fax 518-648-6395
MODEL 65306
AMBIENT NOISE SENSING -
AUTOMATIC LEVEL CONTROL/LIMITER
INSTALLATION & OPERATION MANUAL
The Model 65306 Ambient Noise Sensing-Automatic
Level Control/Limiter is designed for use in profes-
sional sound installations. The unit listens to the
ambient noise level in a particular area, and raises and
lowers the paging and background music levels, in
accordance with changes in the ambient noise level.
The Model 65306 has a number of user definable
features, that allow the system designer to tailor the
performance to a particular installation.
The unit is designed to be placed in the program chain
prior to the power amplifiers, and after the paging and
background music sources. A sensing microphone, or
a sensing speaker, or even the paging speaker(s) may
be used as an ambient noise sensing device. (The
paging speakers may be used for sensing only when
there is no background music.) The sensing device
sends information on the present ambient noise con-
dition, back to the Model 65306. Based on the
information the unit receives from the sensing
device, the 65306 raises or lowers the output level it
sends to the power amplifier(s).
The 65306 has three separate inputs for paging
sources, and one for the background music signal.
Applying an audio signal to any paging channel will
automatically mute the background music signal. In
addition, applying an audio signal to any higher level
paging channel will mute any lower level audio signal. The 65306 may be used in either a freeze sensing
mode, or a continuous sensing mode. The freeze
sensing mode freezes the sensing level at the begin-
ning of a page, and allows sensing to resume at the
end of a page. The continuous sensing mode allows
the unit to continue sensing thoughout the paging
announcements. The determination of which mode to
use is controlled by the wiring of the sensing device on
the rear barrier terminal.
The 65306 incorporates a relay which is automatically
activated when an audio signal is applied to any
program input. By wiring the sensing device thru the
relay terminals, the sensing device may be discon-
nected during paging. Continuous sensing may be
achieved, without fear of runaway gain, by simply
adjusting the Auto-Gain ratio pot The amount of Auto-
Gain is controlled by the Gain Limit pot. This adjust-
ment can be increased in 3dB increments, from 6dB to
21dB.
The output section incorporates a limiter, which can be
adjusted to control maximum output level.
In order to facilitate set-up, a MIN/AUTO/MAX switch
is incorporated into the 65306. The MIN position
allows quick alignment of the input section, the MAX
position allows a fast determination of how much Auto
Gain should be allowed. and the AUTO position allows
the unit to operate without operator intervention.
PROTECH ®
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