Protech 588C User Manual
PROTECH
MODELS COVERED
588C
1/04
®
INSTALLATION & OPERATION MANUAL
INTEGRA III SYSTEM
NOISE GATE/DUCKER
Model 588C Shown
www.protechaudio.com
The 588C Noise Gate/Ducker is designed to
operate as either a single channel noise gate, or as
a noise gate/ducker. In the noise gate mode, the
unit will gate off the input channel gain, until the
input signal exceeds a preset threshold. It will
then turn on the gain, and feed the amplified
input signal through to the output. In the noise
gate/ducker mode the unit will allow the input signal
applied to input #2 to pass through the unit, with or
without additional gain, until the signal applied to
input #1 exceeds the preset threshold. At that
point, the unit will attenuate (duck) the #2 input
signal, and allow the #1 input signal to pass through
to the output.
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, training systems, corporate
boardrooms, etc.,.
Both inputs may be used as either a microphone
level input, or a line level input. Selection is made
via the on-board slide switch at each input.
There are six trimpots mounted on the Model 588C.
The first two are mounted near the middle of the
unit, and are used to adjust the gain of each input.
The other four are mounted on the front of the unit
and are used to adjust gate threshold, gate attack
time, gate release time, and amount of ducking.
The gate adjustments work in conjunction with the
signal being applied to input #1. The ducking adjustment determines how much attenuation will be
applied to the input #2 signal.
In addition to the 2 main inputs, the Model 588C
also features provision for direct inputs to be mixed
into the final output stage. It also has a discrete,
direct output available for both input #1 and #2.
Both the main inputs, and the main output are
balanced, transformer isolated.
The Model 588C is designed to mount in the Model
857/857B or 858/858B Card Frame Package. The
unit may be mixed or matched with other INTEGRA
III SYSTEM cards to create a complete audio
system.
The Model 588C Noise Gate/Ducker may be expected to provide years of uninterrupted, quality
service.
Protech Audio Corp., 192 Cedar River Road, Indian Lake, New York, 12842 Voice 518-648-6410 Fax 518-648-6395
INSTALLATION
INSTALLATION
The 588C Line Amplifier/Tone Control Card is
designed to be mounted in the Model 857/857B
Card Frame Package, or the Model 858/858B Card
Frame Package. The Model 857/857B Card Frame Package will accomodate up to 10 audio cards, and requires an
external power supply. The Model 858/858B Card Frame
Package will accomodate up to 9 audio cards, and has a
built-in, unpluggable power supply card.
Both card frame assemblies buss the DC power to the
individual card slots, and provide screw-type barrier termination points for audio and DC connections.
The determination as to which card frame assembly
to use in your project, was made prior to our factory
receiving the order. The card frame assembly you have
received will accommodate the group of cards you or
your designer have specified.
The actual steps necessary for installation of the Model
588C Noise Gate/Ducker, are comparable to those necessary for any of the INTEGRA III SYSTEM cards. They
are as follows:
1- Mount the card frame in an appropriate EIA 19" width
rack, using 4 screws of sufficient tensile strength to
provide secure mounting.
2- A determination has been made as to which type of
power supply will be used on your system. Follow the
instructions for the type of power supply you will be
installing.
EXTERNAL POWER SUPPLY.
If an external power supply is to be used, terminate
the proper supply connections to pins 1, 2, & 3 of the
DC barrier connector , as shown in the card frame layout
drawing. Turn on the power supply, and using a DC
voltmeter, check for correct voltage and polarity at pins
1, 2, & 3 of the barrier connector.
INTERNAL POWER SUPPLY.
If a plug-in power supply card is to be used, plug in
the supply card, turn it on, and check for proper
illumination of both the positive and negative voltage
LED's, on the power supply card front panel.
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. Terminate each unused input with
a 1K ohm resistor.
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
card at a time and turn on the power supply, unplug the
card and recheck terminations. I f n o 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 the remains is the alignment.
half-way into the card frame, plug in one
ALIGNMENT
Each 588C has been shipped from the factory with the input
selector switch in the line input position, and the gain
aligned for unity gain (level in = level out with 600 ohm
load). The gate adjustments, and the ducking adjustment
have been set at t h e factory t o t h e most used settings,
and should not require adjustment If other than unity
gain is required, the following alignment is recommended.
1- Select Mic or Line inputs, via slide switches mounted
onback end of PC Assembly.
2- Apply a signal representative of the actual signal to
be used t o input #2 (ducked channel) and adjust gain
trimpot marked Duck on facing page, until the output
reaches the desired level. (Recommended output level is
-10 to 0dB).
3- Apply a signal representative of the actual signal
to be used to input #1 (gate channel) and adjust gain
at trimpot marked Gate on facing page, until the output
reaches the desired level (Recommended output level is 10 to 0dB).
4-Adjust Attenuation trimpot, Attack and Release trimpots,
and Threshold trimpot, as necessary.
This completes the alignment procedure for the Model
588C Noise Gate/Ducker card. The card may be expected
to provide years of quality audio service.
PROTECH AUDIO
Shaded Area Connections Are
Special Features,
Not Used in Normal
Noise Gate/Ducker Operation.
600-10K
Load
REL =
ATT =
ATTN =
THRES =
GAIN, Gate =
GAIN, Duck =
LED
THRES
ATTN
REL
ATT
Release Trimpot, CounterClockwise = Slower Release
Attack Trimpot, Clockwise = Faster Attack
Attenuation (Duck) Trimpot, Clockwise = More Attenuation (Ducking)
Threshold Trimpot, Counterclockwise = Lower Threshold
Gate Channel Gain, Clockwise = More Gain
Duck Channel Gain, Clockwise = More Gain
GAIN-Duck
GAIN-Gate
®
CONNECTOR & TRIMPOT DRAWING
MODEL 588C NOISE GATE/DUCKER CARD
800 SERIES BACKPLANE CONNECTIONS
Audio In LO, Gate Channel
Audio In HI, Gate Channel
Audio In HI, Duck Channel
Audio In LO, Duck Channel
Discrete Output, Gate Channel
Summing Junction Resistor Isolated Input
Summing Junction Resistor Isolated Input
Discrete Output, Duck Channel
Direct Summing Junction Input
Audio Output LO, Summed Output
Audio Output HI, Summed Output
GATE CH.
Line
DUCK CH.
Line
INTEGRA III SYSTEM
GROUND
GROUND
GROUND
GROUND
Mic
Mic
Caution!
Mic Input has
Phantom Power
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