® 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.
Your HUSH® Pro noise reduction system has been tested and complies with the following Standards and Directives as set forth by the European Union: Council Directive(s): 89/336/EEC Standard(s): EN55013, EN50082-1 Electromagnetic Compatibility 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.
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.
OPERATING PRECAUTIONS NOTE: IT IS VERY IMPORTANT THAT YOU READ THIS SECTION TO PROVIDE YEARS OF TROUBLE FREE USE. THIS UNIT REQUIRES CAREFUL HANDLING. All warnings on this 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.
Front Panel 1 2 3 4 5 1 POWER LED When lit, this LED indicates that the HUSH Pro is powered and ready for operation. 2 HUSH THRESHOLD control This control sets the point at which the downward expander and dynamic filter begin to operate. 3 GATE THRESHOLD control and GATE RELEASE LED 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.
Rear Panel 6 CH. A (MONO) IN jacks 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". 7 CH. B IN jacks 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. 8 CH. A jacks This XLR and ¼" mono jack provide the output from the "CH.
System Connections Connection mixer to powered speakers 7
Connection mixer to powered monitors.
Connection direct mic plug into main input of channel. In this application the HUSH Pro acts as a "hard gate with noise reduction" which will help curb feedback. Can be used like this or with the HUSH Pro in the channel insert.
Connection powered box mixer to speakers using XLR jacks 10
Connection mixer to EQ to powered speakers 11
Connection mixer to EQ and power amp to speakers 12
Connection mixer with HUSH Pro in the Channel Insert 13
Connection mixer with HUSH Pro in the Main Insert 14
Connection mixer to EQ and power amp to monitors 15
Operation When used properly, the HUSH Pro should be completely transparent (i.e., it should not effect the audio signal—only the noise). To maximize the performance of the HUSH Pro, it is necessary to understand its front panel controls and how they work together. By understanding how these controls work, it will be easier to correctly set up the HUSH Pro to suit any application. The HUSH Pro front panel provides two controls which each manipulate both channels simultaneously.
This means that if a signal is present at the input which consists of primarily bass components, the dynamic filter will reduce mid or high band noise. If no mid or high band information is present, the filter will close down to a pre-set cut-off point of 1kHz (allowing only frequencies of 1kHz and below to pass). However, if the input signal has high frequency components present, the dynamic filter will open fully to pass the signal and eliminate the possibility of a loss of high end frequency response.
The front panel HUSH Threshold control determines the minimum input level at which the HUSH filter and downward expander will begin to operate. Setting this control too high will result in a loss of sustain, as notes will tend to die out much faster than they should. Conversely, when set too low, the expander will close too late (if at all) and the noise floor will remain audible Gate Section The other half of the HUSH Pro consists of a noise gate.
Specifications Maximum Input Level +15dB (+4 Ref.) +5dB (-10dB Ref.) Input Impedance 1/4" Jacks 470K Ohms Output Impedance 1/4 Jacks 100 Ohms Imput Impedance XLR Jacks 10k Ohms Output Impedance XLR Jacks 2.2k Ohms Effective Noise Reduction up to 72dB Frequency Response Dynamic Range Noise Floor THD + Noise Current Consumption Dimensions ±.5dB, 10Hz - 27kHz 105dB -100dBu .041% @ 0dBu, 1kHz (typ) 405mA 19" x 4" x 1¾" Note: 0dBv = 0.
Rocktron -A Division of GHS Corporation 2813 Wilber Avenue Battle Creek MI 49037 USA Rocktron Phone: 1-(269)-968-3351 Email: info@rocktron.com www.rocktron.com 2008-0001 Rev.