ISP Technologies DECIMATOR PRO RACK User Manual

INTRODUCTION

The Decimator ProRack noise reduction system defines a new standard for excellence
in real time noise reduction performance. The Decimator ProRack was designed to
provide the maximum possible performance in a rack mount dual channel noise
reduction system. The Decimator ProRack has dual processing channels incorporating
both low-level downward expansion and dynamically controlled low-pass filtering in a
very easy to use single rack space unit. The Decimator ProRack is based on ISP
Technologies patent pending “Time Vector Processing” which provides the most
adaptively dynamic release response characteristics of any real time noise reduction
system. The patent pending Time Vector Processing dynamic response circuit is used
to control the release time constant of both the downward expander and dynamic filter.

Please read this manual carefully for a through explanation of the Decimator ProRack
and its functions.

PRECAUTIONS

NOTE: IT IS VERY IMPORTANT THAT YOU READ THIS SECTION TO PROVIDE YEARS OF
TROUBLE FREE USE. THIS UNIT REQUIRES CAREFUL HANDELING.

All warnings on this equipment and in the operation instructions should be adhered to and
all operating instructions should be followed.

Do not use this equipment near water. Care should be taken so that objects do not fall onto
and liquids are not spilled into the unit through any openings.

The power cord should be unplugged from the outlet when the unit is left unused for a long
period of time.

DO NOT ATTEMPT TO SERVICE THIS EQUIPMENT. THIS EQUIPMENT SHOULD BE
SERVICED BY QUALIFIED SERVICE PERSONNELL ONLY. DO NOT MAKE ANY INTERNAL
ADJUSTMENTS OR ADDITIONS TO THIS EQUIPMENT AT ANY TIME. DO NOT TAMPER
WITH INTERNAL ELECTRONIC COMPONENTS AT ANY TIME. FAILURE TO FOLLOW THESE
INSTRUCTIONS WILL VOID THE WARRANTY OF THIS EQUIPMENT, AND MAY CAUSE A
SHOCK HAZZARD.

POWER REQUIREMENTS

This unit accepts power from the 9V AC power adaptor supplied with the unit. This 9V RMS
AC voltage is internally processed by a voltage doubler, which generates a bi-polar + and –
15V power supply to maintain the headroom and sound quality of professional, studio
quality equipment. Using an external power source minimizes excessive noise and hum
problems often associated with internal transformers, providing optimal performance for the
user.

FRONT PANEL

1. POWER SWITCH

Switches the unit on and off.

2. POWER LED

Indicates when the power is on.

3. FILTER TRACKING CONTROL

This control adjusts the sensitivity of the filter threshold in relation to the downward
expander threshold. Turning this control clockwise increases the level at which the
dynamic filter opens. Turning this control counterclockwise decreases the level at
which the dynamic filter opens.

4. CHANNEL IN/OUT SWITCH AND LED

This switch is used to switch each individual channel in or out of the circuit path.
When the led is lit, the channel is active.

5. INPUT/OUTPUT REFERENCE LEVEL SWITCH

This switch changes the input and output operating reference level of each
individual channel from –10dbu when switched out, to +4dbu when switched in.

6. GAIN REDUCTION METER

This meter indicates the current amount of gain reduction (in decibels) taking place
in each channel.

7. CHANNEL THRESHOLD

This is the master threshold for each individual channel. This control is used to
adjust the threshold for both the dynamically controlled low pass filter and the low
level downward expander. NOTE: Adjusting the
the sensitivity of the dynamic filter in relation to the sensitivity of the downward
expander.

Filter Tracking

control will shift