Rocktron HUSH Pro User Manual
®
Instruction Manual
May be covered by one or more of the following: U.S. Patents #4538297, 4647876, 4696044, 4745309,
4881047, 4893099, 5124657, 5263091, 5268527, 5319713, 5333201, 5402498 and 5493617.
Other patents pending. Foreign patents pending.
HUSH ® is a registered trademark of GHS Corporation
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®
Your HUSH
Pro noise reduction system has been tested and complies with the following Stan-
dards and Directives as set forth by the European Union:
Council Directive(s): 89/336/EEC Electromagnetic Compatibility
Standard(s): EN55013, EN50082-1
This means that this product has been designed to meet stringent guidelines on how much RF
energy it can emit, and that it should be immune from other sources of interference when properly
used. Improper use of this equipment could result in increased RF emissions, which may or may
not interfere with other electronic products.
To insure against this possibility, always use good shielded cables for all audio input and output
connections. Also, bundle audio cables separately from the AC power cables. These steps will help
insure compliance with the Directive(s).
For more information about other Rocktron products, please see your local dealer or one of our
importers closest to you (listed on the enclosed warranty sheet).
Copyright © 2008 GHS Corporation
All Rights Reserved.
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Introduction
Congratulations on your purchase of the Rocktron HUSH® Pro!
Designed for audio applications, the HUSH Pro utilizes the latest in our HUSH noise
reduction technology combined with the latest V.I.R. (Variable Integrated Release) circuitry
configured as a noise gate. This combination provides extremely effective noise reduction
while playing and complete silence when not.
Although the HUSH Pro is a stereo noise reduction system, a single HUSH Threshold
and Gate Threshold are used to control both channels.
Some suggested uses are displayed in this manual. However, there are many other
uses for the HUSH Pro as well, here is just a partial list of other applications:
PROFESSIONAL GUITAR PREAMP using XLR connections in a rack (pre-effects)
ACOUSTIC GUITAR APPLICATION (Post Acoustic Processor)
VOCAL GROUP SUBMIX INSERT
SNARE DRUM (Could also be used to create a gated reverb effect)
KICK DRUM
TOM TOM SUBMIX
SAXOPHONE when using a microphone
HARMONICA when using a microphone
VIOLIN when using a microphone or violin pickup
This manual will introduce you to the various features and functions of the HUSH
Pro. Please keep it for future reference.
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OPERATING PRECAUTIONS
NOTE: IT IS VERY IMP ORTANT THAT YOU READ THIS SECTION TO
PROVIDE YEARS OF TROUBLE FREE USE. THIS UNIT REQUIRES CAREFUL HANDLING.
All warnings on th is equipment and in the operating 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 and liquids are not spilled into the unit through any openings.
The power cord should be unplugged from the outlet when left unused for a
long period of time.
DO NOT ATTEMPT TO SERVICE THIS EQUIPMENT. THIS EQUIPMENT
SHOULD BE SERVIC ED BY QUALIFIED PERSONNEL ONLY. DO NOT
MAKE ANY INTERNAL ADJUSTMENTS OR ADDITIONS TO THIS EQUIP
MENT AT ANY TIME. DO NOT TAMPER WITH INTERNAL ELECTRONIC
COMPONENTS AT ANY TIME. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY VOID THE WARRANTY OF THIS EQUIPMENT, AS WELL AS
CAUSING SHOCK HAZARD.
POWER REQUIREMENTS
-
This unit accepts power from the 9VAC/1.5A adaptor supplied with the unit.
This 9 volt RMS AC voltage is internally processed by a voltage doubler which
generates a bipolar ±15 volts to maintain the headroom and sound quality of
professional, studio quality equipment. Using an external power source such as
this minimizes excessive noise and hum problems often associated with internal
transformers, providing optimal performance for the user.
OPERATING TEMPERATURE
Do not expose this unit to excessive heat. This unit is designed to operate between 32° F and 104° F (0° C and 40° C). This unit may not function properly
under extreme temperatures.
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Front Panel
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4 532
POWER LED
1
When lit, this LED indicates that the HUSH Pro is powered and ready for operation.
HUSH THRESHOLD control
2
This control sets the point at which the downward expander and dynamic filter begin to
operate.
GATE THRESHOLD control and GATE RELEASE LED
3
This control is used to determine the level at which the gate will begin to operate. As the
input signal drops below this level, the gate will activate and downward expansion will
begin.
When lit, the Gate Release LED indicates that the input signal has dropped below the
level set by the Gate Threshold control, thus activating the gate and providing additional
downward expansion.
IN/OUT switch and LED
4
This switch allows for the HUSH Pro to be bypassed when noise reduction is not required.
When lit, the LED indicates that the HUSH Pro is currently active in the signal path.
REF switch
5
This switch determines the sensitivity of the HUSH Pro. When using the HUSH Pro with
professional audio equipment providing a nominal output level +4dB, it is recommended
that the "+4dB" setting on the unit as the Threshold adjustment will allow you to optimize
noise reduction for this reference level.
If the "-10" setting is used and the unit is overdriven, the "+4" setting should be used.
**The -10db setting is recommended for all instrument rigs.
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Rear Panel
CH. A (MONO) IN jacks
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This XLR and ¼" mono jack provide inputs to the left channel of the HUSH Pro. Use
either the XLR jack or the ¼" jack when connecting, but not both together. When using
only one input use the "CH. A (MONO) XLR or ¼" jack".
CH. B IN jacks
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This XLR and ¼" mono jack provide inputs to the right channel of the HUSH Pro. Use
either the XLR jack or the ¼" jack when connecting, but not both together.
CH. A
8
This XLR and ¼" mono jack provide the output from the "CH. A (MONO)" channel of the
HUSH Pro.
CH. B jacks
9
This XLR and ¼" mono jack provide the output from the "CH. B" channel of the HUSH
Pro.
POWER jack
10
This 2.5mm pin jack accepts power from the 9VAC adapter supplied with the HUSH Pro.
jacks
Note: When "CH. A" is used as a single signal source, the signal will be
present in both the "CH. A" and "CH. B" outputs.
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