Protech Audio 899B - Manual

MODELS COVERED
INTEGRA III SYSTEM
INSTALLATION & OPERATION
MANUAL
DUAL AUDIO DISTRIBUTION AMPLIFIER CARD
899B
The 800 Series Audio Distribution Amplifiers are
designed for use in professional audio applications.
Each model is designed to accept an audio signal(s)
in, and send the signal(s) to multiple destinations.
Typical applications are public address announcements
that must be fed to different zones or power amplifiers,
program material that must be fed to different studios,
headphone listening systems where the user can select
different program sources, or audio recording systems
where the program material must be fed to the record-
ers at the same time it is being fed to a public address
system. The actual application of the distribution ampli-
fiers is found in such buildings as airports, factories,
courthouses, casinos, convention centers, libraries,
racetracks, training systems, and corporate board-
rooms, to mention a few.
The 800 Series Audio Distribution Amplifiers are
designed to incorporate a combination of features that
will allow the units to deliver maximum performance
and reliability. Each circuit is designed with a minimum
of components, to reduce the possibility of failure, while
still maintaining perfromance and feature criteria. The Model 899B is a dual, 1 input by 2 output device. Each
of the two identical circuits may be used to “split” an audio
feed to two different locations.
The gain structure of the Model 899B allows the level of
each output to be individually adjusted. The output level
may be adjusted up, or down, with respect to the input
level. If a low input level is present, and more gain is
required, the input section has an additional 15dB of gain.
The trimpots used to adjust the input and output levels are
mounted on the accompanying backplane assembly.
This feature allows the system gain settings to remain
adjusted, even when a distribution amplifier is removed
from it's slot, and a spare unit is plugged into that slot.
Since the 800 Series ADA's are used to connect multiple
pieces of audio equipment, and there exists the potential
for creating ground loops when doing so, the input sec-
tion, and each of the outputs are individually isolated
using high quality audio transformers. This feature pro-
vides the maximum in isolation and ground loop preven-
tion.
PROTECH
®
1/02
Model 899B Shown
www. protechaudio .com
Protech Audio Corporation, PO Box 597, 192 Cedar River Road, Indian Lake, New York, 12842, Voice 518-648-6410 Fax 518-648-6395