Protech Audio 800 SERIES Installation & Operation Manual

®
PROTECH
INTEGRA III SYSTEM
INTEGRA III SYSTEM

MODELS COVERED

838B 846B
839B 847B
840B* 848B*
*Microphone Preamplifier
www.protechaudio.com
The 800 Series Compressor/Preamplifier and Line
Amplifiers are designed for use in professional audio
appplications. Each model has either one or two
channels, designed to operate as a discrete micro-
phone preamplifier or line amplifier. Dual channel
cards will have two identical channels constructed on
one printed circuit board.
Typical applications are public address systems,
broadcast studios, sales presentation rooms
headphone listening systems, multi-room audio
systems, and recording systems. The actual
application of the amplifiers is found in buildings
such as airports, factories, courthouses, casinos,
convention centers, libraries, hotels, racetracks, train-
ing systems, corporate boardrooms, etc...
The 800 Series Compressor/Preamplifiers come
in two different models. There is a single channel
model, and a dual channel model. Both models have
low impedance transformer isolated inputs. The gain
of each model is adjustable, via trimpots mounted on
the backplane assembly, from 17 to 56dB. The
output section is available in either unbalanced
direct, or balanced transformer isolated versions.
Protech Audio Corporation, PO Box 597, 192 Cedar River Road, Indian Lake, New York, 12842, Voice 518-648-6410 Fax 518-648-6395
1/02
800 SERIES
COMPRESSOR/PREAMPLIFIERS & LINE AMPLIFIERS
Installation & OPERATION MANUAL
Model 848B Shown
www.protechaudio.com
The 800 Series Compressor/Line Amplifiers offer 4
different models, 2 single channel versions, and 2 dual
channel versions.
The input section of the line amplifiers is available in
two different impedances. They are; bridging
balanced-transformer isolated, and 600 Ohm
balanced-transformer isolated. This allows the user
to match the line amplifiers to a variety of
professional audio equipment.
The trimpots used to adjust the gain levels and the
threshold of compression, are mounted on the
backplane assembly. This feature allows replace-
ment of a card, without the need to readjust gains and
thresholds. The compression ratio is 2.2:1. The
output section of the line amplifiers is balanced
transformer. On page 3 of this manual, you will find a
table showing the model numbers, and features of
each of the microphone preamplifier/compressors,
and the line amplifier/compressors.
Each of these products is designed to provide the
user with high quality audio, for years
uninterrupted service.
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