Protech Audio Corporation Flowerfield Bldg. 1, St. James, NY 11780 631-584-5855, FAX 631-584-5904
MODEL 2000-C
DUGAN - COURTROOM AUTOMATIC MIXER
WITH MIX-MINUS & LOGGING OUTPUTS.
INSTALLATION & OPERATION MANUAL
The Protech Audio Model 2000-C Courtroom Automatic
Mixer is designed to be the best sounding, most
transparent auto-mixer, for courtroom installations. From
the properly implemented Dugan Speech System for
transparent gain-sharing, to the logging recorder
outputs, to the mix-minus outputs for maximum sound
reinforcement, to the card frame mechanical packaging,
the Model 2000-C is constructed to provide the designer
and installer with every feature needed for perfect
courtroom auto-mixer installations.
Before proceeding further, please make note that the
Model 2000-C is shipped from the factory with all prelim-
inary adjustments made
. Each input channel is set to
microphone input, 50dB of gain. The tone controls on
each input are set to flat, and the master output level
is set to unity. The unit should be installed, turned on
and listened to, before any additional adjustments are
made. In many installations, no further adjustments will
be required. If line level inputs are to be used, the mic/
line slide switch on that input should be reset to the line
position.
The first feature to make note of is the patented Dugan
Speech System for proper gain sharing in automatic
mixing applications. This operating system, when proper-
ly implemented, results in the best, most transparent
automatic mixing to be found anywhere. A short listening
demonstration has impressed even the most critical audio
system designers.
The second feature to be discussed is the logging
recorder outputs. Each Model 2000-C chassis assembly
will allow up to 4 logging recorder outputs.
Each output contains the sum of two input channels
(logging recorder output #1 contains input signals from
channels 1 & 2).
The third feature to consider is the mix-minus outputs.
Each Model 2000-C chassis assembly provides four mix-
minus outputs, to allow custom mixes, with signals
levels independently adjusted, to be sent to different
areas of the sound reinforcement system. This approach
allows much more gain before feedback. Other systems
require any number of additional pieces of equipment,
like wiring matrixes, to achieve mix-minus. In the
Model 2000-C, the mix-minus feature is inherent in the
design.
In addition to the logging recorder and mix-minus
outputs, each input section incorporates a number of
features, to allow installations to be done quickly, with
a minimum of wiring and set-up time. High-Pass filters,
Bass and Treble Controls, Logic Outputs, Phantom
Power, and Mute functions are built into each input
channel.
The output card has provision for two balanced line
outputs, Auxillary Input, switch selectable Master/Slave
operation, Gain Trim, Remote Volume Control, Group
Mute, Pink Noise Generator, and optional Automatic
Level Control.
The optional Automatic Level Control works in a very
unique manner. Instead of adjusting levels at the output
only, the ALC reaches back into each input channel
and readjusts the gain at each input. This feature allows the
mix-minus to remain properly adjusted.
The card frame assemblies are linkable, to create systems
with up to 100 microphone inputs. The linking is accom-
plished by using standard DB15 cables.
PROTECH
®
1/03
www.
protechaudio
.com
