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1.1 INTRODUCTION 

Thank you for purchasing the PreSonus GTX44 four channel dynamics processor. This processor was designed using state of 
the art components to deliver crystal clear compression and limiting for an infinite period of time. We believe that it is an 
exceptional sounding unit as well as an exceptional value. Feel free to contact us at 1-800-750-0323 anytime for any reason 
whatsoever. We value your suggestions and your comments! 
 
Please pay close attention to how you connect your GTX44 to your system. Improper grounding is the most common cause 
of noise problems found in studio or live sound systems. We urge you to at least scan this manual before hooking up your 
GTX44 to become familiar with its features and various applications. 
 
Good luck and enjoy your GTX44! 
 
 
 

1.2 FEATURES 

The following is a summary of your GTX44's features: 
 

Full Featured Gate/Expander 

Each channel of yourGTX44 can be used as a frequency specific gate or expander, depending on your needs and settings. 
 

Channel Linking 

Using the Link function, you can link together two channels of the GTX44 for stereo operation. When linked, the processor 
follows the setting of linked channel to the left, which becomes the master. When two channels are linked the sidechains are 
summed. 
 

Separate Bypass for Each Channel 

All four channels have a separate bypass for listening to 'before and after' performance tests. 
 

Insert Sidechain on Each Channel 

Each channel of your GTX44 was designed with a special jack for spectral processing, and ducking applications. Sidechaining 
is useful for automatically ducking tracks behind a narrator for 'auto mixing' a service, broadcast or performance. 
 

Duck Mode 

Ducking lowers the level of the audio signal based upon the level of a second sidechain audio signal. 
 

Balanced XLR and Unbalanced 1/4" Tip/Ring/Sleeve Input/Output 

Your GTX44 accepts XLR connectors for balanced or a single 1/4" TRS for unbalanced inputs and outputs.  
 

+4dBu or -10dBV Insert Switch 

The operating level of your GTX44’S inserts can be switched b4dBu (pro levels) to -10dBV (line levels) for ease of 
use with external equipment in any situation. 
 

To Get Help 

Call Us: 1-800-750-0323, 9AM to 5PM, CST 
Visit our World Wide Web site: http://www.presonus.com 
Email Us: [email protected] 

Summary of Contents for GTX 44

Page 1: ...GTX44 Four Channel Gate Expander User s Manual VERSION 1 1...

Page 2: ...nit returned for repair PreSonus reserves the right to change or improve design of the product at any time without prior notice This warranty does not cover claims for damage due to abuse neglect alte...

Page 3: ...e purchased or to the PreSonus factory in the U S in the original packaging or a replacement supplied by PreSonus with all transportation cost and full insurance paid each way by the purchaser or owne...

Page 4: ...uction 1 2 Features 2 Controls Connections 2 1 Front Panel Basic Layout 2 2 Gate Expander Controls 2 3 Bypass Link 2 4 Patch Panel 2 5 Power 3 Basic Setup Applications 3 1 Basic Applications 4 Technic...

Page 5: ...tion you can link together two channels of the GTX44 for stereo operation When linked the processor follows the setting of linked channel to the left which becomes the master When two channels are lin...

Page 6: ...by the amount set by the ratio and or range control Ratio The expansion ratio sets the amount of noise reduction applied to a signal once the signal has dropped below the expansion threshold For exam...

Page 7: ...from a paging microphone and triggers a reduction in the output level of the main audio signal for the duration of the page signal It restores the original level once the page message is over Bypass...

Page 8: ...s impossible to set a noise gate to open precisely when an instrument sounds in a noisy environment Most gates feature an external gate key that will allow the gate to be opened using an external sign...

Page 9: ...expansion threshold The amount of level reduction is determined by the expansion ratio For example a 2 1 expansion ratio reduces the level of a signal by a factor of two e g if a level drops 5dB below...

Page 10: ...ng Too high of a threshold setting might disrupt the snares natural sound too low will let those other drums open the gate You need to adjust the gate s threshold and release to suit your drumming tas...

Page 11: ...0dB to 80dB Input Impedance 10kOhms Output Impedance 51 Ohms THD Noise 0 05 Gate Metering 3dB to 30dB Sidechain Output Impedance 51 Ohms Sidechain Input Impedance 10kOhms Internal Operating Level 4dBu...

Page 12: ...lity of your unit Installing the GTX44 into an Existing Rack If you are installing your CL44 into an existing equipment rack it may be necessary to purchase some additional cabling Most dynamics proce...

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