Protech Audio 824B - Manual

MODELS COVERED
The 800 Series Limiter/Preamplifier and Line Ampli-
fiers 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 Limiter/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. The 800 Series Limiter/Line Amplifiers offer 4 differ-
ent 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 limiting, are mounted on the backplane
assembly. This feature allows replacement of a card,
without the need to readjust gains and thresholds.
The limiting ratio is 40:1. 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/limiters, and the line amplifier/limiters.
Each of these products is designed to provide the
user with high quality audio, for years of
uninterrupted service.
800 SERIES
LIMITER/PREAMPLIFIERS & LINE AMPLIFIERS
INSTALLATION & OPERATION MANUAL
822B
823B
824B*
830B
831B
832B*
*Microphone Preamplifier
www. protechaudio .com
PROTECH
®
INTEGRA III SYSTEM
INTEGRA III SYSTEM
1/02
Model 832B Shown
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Protech Audio Corporation, PO Box 597, 192 Cedar River Road, Indian Lake, New York, 12842, Voice 518-648-6410 Fax 518-648-6395