Protech 2000-600 User Manual

PROTECH

MODELS COVERED

2000-674

(2 x 1)

2000-675

(3 x 1)

2000-676

(4 x 1)

®

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MIXER LINE AMPLIFIERS

INSTALLATION & OPERATION MANUAL

INTEGRA III SYSTEM

2000-600 SERIES

2000-677

(5 x 1)

The 600 Series Mixer/Line Amplifiers are designed for use in

professional audio applications. Each model is designed to

accept multiple audio signals in, and combine the individual

signals into one common output signal.

Typical applications are public address announcements with

background music or different paging stations, program

material that must be combined from different studios, head-

phone listening systems where the user can select different

program material must be fed to the recorders at the same time.

The actual application of the Mixer/Line Amplifiers is found

in buildings such as airports, factories, courthouses, casinos,

convention centers, libraries, racetracks, training systems,

and corporate boardrooms, to mention just a few.

The 2000-600 Series Mixer/Line Amplifier are designed to

incorporate a combination of features that will allow the units

to deliver maximum performance and reliabiltiy. Each circuit

is designed with a minimum of components, to reduce the

possibility of failure, while still maintaining performance and

feature criteria.

Each one of the 2000-600 Series Mixer/Line Amplifiers is

designed with the same combination of features, with the

Model 2000-677 Shown

exception of the link capabiltiy. The number of inputs is the

only variable between models.

The gain structure of the 2000-600 Mixer/Line Amplifiers allows

the gain of each input section, and the output section to be

adjusted on an individual basis. The units are shipped from the

factory adjusted for unity gain, with respect to the input level.

If a higher output level is required from the unit, the output

gain should be adjusted. If an unusually low input level is

present, and more gain is required for that input channel, each

input section has an additional 15dB of adjustable gain. The

trimpots used to adjust the input and output levels are

mounted on the module printed circuit board. A drawing

showing the location and function of each gain trimpot is

provided later in this manual.

Since the 2000-600 Mixer/Line Amplifiers are designed to be

used in high quality installations, the input sections and the

output section on each unit are individually isolated using the

highest quality audio transformers.

These products are designed to provide the user with high

quality audio, for years of uninterrupted service.

Protech Audio Corp., 1 Flowerfield, Suite 24, St. James, NY 11780 Phone [phone] FAX [phone]

INSTALLATION

ALIGNMENT

The 2000-600 Series Audio Mixer/Preamplifiers are

designed to be mounted in the Model 2000-CH

Card Frame .

The actual steps necessary for installation of the Model

2000-600 Mixer/Line Amplifier cards, are comparable to

those necessary for any of the 600 series cards. They

are as follows;

1- Mount the card frame in an appropriate EIA 19" width

rack, using 4 screws of sufficient strength

to provide secure mounting.

2- Select the card slot to be used for the distribution

amplifier card. Slots 1 to 8, starting with slot 1 on the left

side of the card frame, as viewed from the front of the card

frame, will accept any of the four models of distribution

amplifier card.

3- Terminate all audio input and output connections,

using the card connection drawing on the facing page.

Double conductor shielded cable is recommended for

all audio connections.

4- Unpack each individual card, inspect for shipping

damage, and assuming none is found, slide the

card half-way into the appropriate slot. After all cards

have been installed half-way into the card frame, plug in

one card at a time and turn on the power supply. Make sure

no unusual loading is indicated at the power supply . If

loading is noticed, turn off the power supply, unplug the

card and recheck terminations. If no loading is noticed,

continue inserting each card in the card frame, checking

power supply loading as each card is plugged in. When all

the cards have been plugged in, the installation is

complete, and all that remains is the alignment.

Each 2000-600 Series Mixer/Line Amplifier card has

been shipped from the factory aligned for unity gain. This

alignment optimizes headroom. If additional gain is

required in the mixer/Line Amplifiers, the following

alignment procedure is recommended;

1 - Remove the Mixer/Line Amplifier from the card slot, plug

in the Model 516 Extender Card, and plug the card into the

extender card connector.

2 - Apply a signal representative of the actual signal level to

be used, to the #1 input.

3 - While monitoring the output channel, turn the input gain

trimpot clockwise, until the output signal reaches the

desired level.

4 - Repeat step #3 for each input on your Mixer/Line

Amplifier

This completes the installation and alignment of your 2000-

600 Series Mixer/Line Amplifier. The mixer may be

expected to deliver years of uninterrupted service.

Note #1 -

The alignment procedure outlined above will almost always

provide the desired output level. However, when an unusu-

ally low input signal level is present, the installer may wish

to use the additional gain available in the output gain stage.

Note #2 -

The alignment procedures for 2000-600 Series Cards,

differ from card type to card type. Therefore it is

necessary to consult the alignment procedure for each

type of card being installed, to properly align a card

frame using different card types.

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