MODELS 2004 & 2008
DUGAN AUTOMATIC MIXERS
INSTALLATION & OPERATION MANUAL
The Protech Audio Models 2004.2008 Automatic Micro-
phone Mixers are designed to be the best operating, most
transparent auto-mixers, for rental and portable applica-
tions as ell as small venues. Both the 2004 and 2008
feature patented adaptive proportional gain sharing
control circuitry designed by Dan Dugan, the inventor
of automatic mixing. This operating system results in the
best, most transparent automatic mixing to be found
any here. Unlike gated mixers, or quasi-Dugan mixers,
the 2004 and 2008 operate on an elegantly simple prin-
ciple; each individual input channel is attenuated by an
amount, in dB, equal to the difference, in dB, bet een that
channel's level and the sum of all channel levels. The levels
are varied on a continuous basis, ith no on-off actions, or
abrupt gain changes.
The 2008 features 8 s itchable microphone/line level
inputs. The model 2004 features 4 similar inputs. T o
units may be linked together to create up to 16 inputs.
Both units feature a unique orks-in-a-dra er construc-
t io n. Access to al l s itches and push-on jumpers used
to configure various features, is achieved by loosening
the t o thumbscre s located on each side of the front
panel, and sliding the entire electronics out of the chassis.
This easy access allo s complete reconfiguration in just
minutes.
In addition to the input mode (mic/line) s itch located at
each input, the gain of each input is configurable, via a
push-on jumper, to allo superior signal-to-noise opera-
tion. Moving the jumper over one pin changes the input
gain from 30dB to 50dB.
A bi-color LED is used to indicate signal presence and clip
threshold. Unlike other units, the clip indicator on the
Model 2008 indicates clipping of the summing buss, not
just an input, since it is possible to clip a summing bus,
ithout clipping an input.
Internal 15 volt phantom po er is selected, on a channel-
by-channel basis, via a push-on jumper. When the input
mode slide s itch is placed in the line position,
phantompo er ill automatically be disconnected, pre-
venting damage to line level devices.
The Models 2004 and 2008 also feature assignable group
mute function. Each input may be assigned to the mute
buss via an eight position DIP s itch. Turning on a given
s itch ill assign that channel to the group mute.
Grounding the group mute control pin ill mute the as-
signed channels.
The output level of the automixers may be controlled via
the front panel output potentiometer, or, assigned to a
remote potentiometer, via an on-board slide s itch.
Both units have been designed ith the operator in mind.
Control features allo the operator to attend to other
functions, ithout the need to continuously "ride gain".
For additional information on the model 2004 and 2008, or
the Models 2000 Boardroom Automixer, and 2000-C Court-
room Automixer, contact: Applications Assistance
PROTECH ®
1/06
Automatic Mixing with Dugan Speech System.
4/8 Mic/Line Inputs With Selectable Gain St uctu es.
Phantom Powe Capability On Each Input
Clip Indicato Fo All Inputs
Assignable G oup Mute Pe Input
12 Segment LED Mete ing of Output Level
Remote Gain Cont ol Capability On Maste Output.
Linkable fo Mo e Inputs
U.S. Patents 3,992,584, & 4,864,627
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IOM2008.PM6
www.p otechaudio.com
P otech Audio Co po ation, PO Box 597, 192 Ceda Rive Road, Indian Lake, New Yo k, 12842, Voice 518-648-6410 Fax 518-648-6395
