Protech 51003 User Manual

PROTECH

www.protechaudio.com

®

1/06

INSTALLATION & OPERATION MANUAL

MODEL 51003

AUDIO MIXING SYSTEM

PHOTOGRAPH

The Model 51003 Audio Mixing System is designed for
smaller installations, th at e xp ec t t o e xp and in th e near
future. The 51003 incorporates most features that are
required in a professional installation. The unit includes the
following features;

Microphone and/or line level inputs, all transformer isolated.

Phantom power capability selectable for each input.

Selectable gain structures on each input (4 settings).

Low-cut filters, selectable on each input.

Priority setting for channel 1, with automatic override, or,
hard wired to external switch for muting channels 2 thru
AUX.

Adjustable mix level for each input, including AUX.

AUX input hardwired on rear terminal, with front panel jack
to bypass rear input and allow access to mixing buss.

Mixing buss link capability, to allow additional inputs.

Effects send/receive link.

Bass & Treble Controls, with switch selectable defeat mode.

Limiter, with switch selectable defeat mode.

Two transformer isolated outputs, with switch selectable
remote control of output two.

Metering of outputs A/B, with adjustable meter trim

Built-in oscillator to allow quick set-up

In addition to the many features already listed, the Model
51003 is designed to allow the entire PC assembly to unplug
from the front of the chassis to facilitate quick changeovers.
And the UL approved wall mount transformer helps the unit
to provide superior specifications.
The architectural design of the Model 51003 is to allow the unit
to serve as the heart of a small audio system, and still not
become obsolete when the designer wishes to add additional
equipment to the system. For instance, the defeat switches
on both the tone controls, and the limiter, will allow
future addition of an equalizer and/or compressor/
limiter. The defeat switches are activated, and the effects
send is used to introduce these additional pieces of
equipment into the system, without loosing the main
mixing and distributing features of the Model 51003.
The input section has a large number of user definable
features, in order to accomodate the variety of requirements
that may come up in a small installation, such as a House­of-Worship. The electronics may be unplugged from the
front, and re-configured in a matter of moments, to allow
multiple uses of the sound system.
The built-in oscillator, and the LED bargraph metering
of both outputs, helps make the realignment process, after
changeover, as easy as possible. By making use of these
features, the audio engineer can make pr ecise and
repeatable alignments in a matter of minutes.
This installation and operation manual is designed to
help the user become acquainted wi th t he many features
of the Model 51003, and how best to make use of them.
The Model 51003 Audio Mixing System is a perfect
companion to other Protech Audio products, such a s the
Model 5117T Audio Distribution Amplifier, or the Model
65302B Ambient Sensing Level Control.

Protech Audio Corporation 192 Cedar River Road, Indian Lake, New York 12842 Voice 518-648-6410 Fax [phone]

TABLE OF CONTENTS

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Table of Contents.
Block Diagram.
Input & Output Section, Standard Setup and Wiring.
Input & Output Section Mechanical Drawing.
Using Special Features, Setup.
Using Special Features, Setup.
Using Special Features, Setup.
Setup, As Shipped
Specifications.
Schematic, Input Section.

Schematic, Auxillary Input Section.
Page 12 ­Page 13 ­Page 14 ­Page 15 ­Page 16 ­Page 17 ­Page 18 -

Schematic, Priority Circuit.

Schematic, Summing Amplifier.

Schematic, Limiter Circuit.

Schematic, Output Section.

Schematic, Tone Control Circuit.

Schematic, Oscillator Circuit.

Schematic, LED Display Circuit.

Schematic, Power Supply Cir cuit.