GTX44 Owner`s Manual
Contents
1. 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 All four channels have a separate bypass for listening to before and after performance tests 2 5 BYPASS amp LINK Bypass Activating the bypass effectively removes all processing being performed by your GTX44 and returns the signal to unity gain You should use bypass often when setting up your GTX44 to compare the before and after results of the signal processing affecting your audio signal Bypass affects the gate and all its functions When in Bypass the Link function is still engaged but both channels are set to Bypass Mode Link When the Link button is pushed in the channel to the left becomes the master controller of both channels The channel to the right s controls become disabled and metering becomes summed left and right i e stereo mode IMPORTANT When the two channels are linked link button pushed in all of the right channel s controls are inactive 2 6 PATCH PANEL BACK Input Output The input output jacks are unbalanced tip sleeve or ring sleeve connectors or balanced XLR connectors The XLR inputs outputs can handle up to 24dBu unbalanced or balanced 4 10 Switch This switch adjusts the insert operating level of the sidechain of your GT X44 when it is connected to line level 0dB 10dBV gear With the switch in the 10 position2. more audible after the lower end of the dynamic range was raised air conditioner loud drummer etc You might attempt to mute the vocal between phrases in an attempt to remove the unwanted signals however this would probably be disastrous A better method is to use a noise gate The noise gate threshold could be set at the bottom of the dynamic range of the vocal say 10dBu such that the gate would close out the unwanted signals between the phrases If you have ever mixed live you know well the problem cymbals can add to your job by bleeding through your tom mics As soon as you add some highs to get some snap out of the tom the cymbals come crashing through placing the horn drivers into a small orbit Gating those toms so that the cymbals no longer ring through the tom mics will give you an enormous boost in cleaning up the overall mix Expansion There are two basic types of expansion dynamic and downward Expansion increases the dynamic range or level of a signal after the signal crosses the expansion threshold Dynamic expansion is basically the opposite of compression In fact broadcasters use dynamic expansion to undue compression before transmitting the audio signal This is commonly referred to as companding or COMPression followed by expANDING By far the most common use of expansion is downward expansion In contrast to compression which decreases the level of a signal after rising above the compression threshold
3. 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 GT X44 1 2 FEATURES The following is a summary of your GTX44 s features Full Featured Gate Expander Each channel of yourGT X44 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 GT X44 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
4. used to keep the gate open for a fixed period of time following the signal going below the gate threshold This can be really useful for effects such as gated snare where the gate remains open after the snare hit for the duration of the hold time then abruptly closes Hold is only available when the ratio knob is set to GATE Release The gate release time determines the rate at which the gate closes Release times should typically be set so that the natural decay of the instrument or vocal being gated is not affected Shorter release times help to clean up the noise in a signal but my cause chattering in percussive instruments Longer release times usually eliminate chattering and should be set by listening carefully forthe most natural release of the signal SC Mon The SideChain Monitor allows you to hear the frequency range that the Lo and Hi Filter are operating on Link Using the Link function you can link together two channels of the GTX44 for stereo operation When linked the processors follow the setting of linked channel to the left which becomes the master Remember when two channels are linked the sidechains are summed Duck Ducking lowers the level of the audio signal based upon the level of the sidechain audio signal If the unit is in gate mode then you can DUCK according to what the range setting A typical application is paging A ducker senses the presence of audio from a paging microphone and triggers
5. 15dBu 0 01sec to 2sec OdB to 80dB 10kOhms 51 Ohms lt 0 05 3dB to 30dB 51 Ohms 10kOhms 4dBu 0dB 4dBu or 10dBV Switchable 1 4 Tip Sleeve Unbalanced or XLR Balanced 1 4 Tip Ring Sleeve Internal Linear Supply 100 120 220 240VAC Factory Configured 24 Watts 7 Ibs 1U Rack TROUBLESHOOTING Ghost Meters The inputs of the CL44 are not designed to be overdriven In the event that you do overdrive the inputs on one or two channels the meters of the other two channels if not in use may show activity This ghost activity is not signal bleed it is sidechain crosstalk It will not change or affect the processing power or ability 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 processors use a 1 4 TRS Y shaped insert cable to connect to a console The CL44 is designed to connect to a console using one 1 4 TRS cable A 1 4 TRS Y male to dual female cable may need to connect the CL44 to an existing audio snake Once the cabling is connected you only need to press the FLIP switch if the sends returns are not matched up properly
6. GTX44 Four Channel Gate Expander User s Manual VERSION 1 1 PreSonus Limited Warranty PreSonus Audio Electronics Inc warrants this product to be free of defects in material and workmanship for a period of one year from the date of original retail purchase This warranty is enforceable only by the original retail purchaser To be protected by this warranty the purchaser must complete and return the enclosed warranty card within 14 days of purchase During the warranty period PreSonus shall at its sole and absolute option either repair or replace free of charge any product that proves to be defective on inspection by PreSonus or its authorized service representative To obtain warranty service the purchaser must first call or write PreSonus at the address and telephone number printed below to obtain a Return Authorization Number and instructions of where to return the unit for service All inquiries must be accompanied by a description of the problem All authorized returns must be sent to the PreSonus repair facility postage prepaid insured and properly package Proof of purchase must be presented in the form of a bill of sale canceled check or some other positive proof that the product is in within the warranty period PreSonus reserves the right to update any unit 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 abus
7. cess the following should be considered 1 Lowest noise is achieved when using balanced patch bays 2 The input and output jacks should not be normalled the send routed back to the return 3 The sidechain jacks must be normalled Gating Drums or Percussion I nstruments Adjust the Gate on the snare to stop those other drums from bleeding through the snare mic Turn the gate release knob to about the middle position turn the gate attack knob to fully counter clockwise set the gate range to 60dB adjust the gate threshold slowly clockwise until you begin to hear those other drums disappearing 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 taste This simple application applies to any percussive instrument of course Experiment 4 1 SPECI FI CATI ONS Number of Channels Dynamic Range Signal to Noise Ratio Headroom Frequency Response Gate Attack Range Gate Threshold Range Gate Release Time Gate Attenuation Range Input Impedance Output Impedance THD Noise Gate Metering Sidechain Output Impedance Sidechain Input Impedance Internal Operating Level Sidechain Level Input Output Connectors Sidechain Connector Power Supply Power Requirements Power Weight Size 4 gt 115dB gt 95dB 24dBu Unbalanced 24dBu Balanced 10Hz to 50kHz 10mS to 500mS 40dBu to
8. 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 GT X44 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 between 4dBu 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 presonus presonus com 2 1 FRONT PANEL BASIC LAYOUT Notice that the front panel is divided into four identical sections These are the four signal processing channels of the GTX44 Each channel contains Gate Expander Lo Hi Filter SideChain Monitor Link amp Bypass Control Duck Mode 2 2 GATE EXPANDER CONTROLS Lo Hi Filter There are many situations especially with drums when other instruments open up the gate instead of the instrument being gated For example tom tom mics are generally placed very close to the cymbals on a drum kit creating the possibility of the cymbals opening up the tom tom gates The Lo Hi Filters allow the user to specify which frequencies are eligible for gating Therefore the cymbals may be removed from elig
9. e neglect alteration or attempted repair by unauthorized personnel and is limited to failures arising during normal use that are due to defects in material or workmanship in the product Any implied warranties including implied warranties of merchantability and fitness for a particular purpose are limited in duration to the length of this limited warranty Some states do not allow limitations on how long an implied warranty lasts so the above limitation may not apply to you In no event will PreSonus be liable for incidental consequential or other damages resulting from the broach of any express or implied warranty including among other things damage to property damage based on inconvenience or on loss of use of the product and to the extent permitted by law damages for personal injury Some states do not allow the exclusion of limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary form state to state This warranty only applies to products sold and used in the United States of America For warranty information in all other countries please refer to your local distributor Limited Warranty Outside of The U S PreSonus Audio Electronics products are warranted only in the country where purchased through the authorized PreSonus distributor in that country against defects in material and workmanship T
10. expansion decreases the level of a signal after the signal goes below the 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 the expansion threshold the expander will reduce it to 10dB below the threshold Commonly used as noise reduction expansion is very effective as a simple noise gate The major difference between expansion and noise gating is the fact that expansion is dependent on the signal level after crossing the threshold whereas a noise gate works independent of a signal s level after crossing the threshold Noise Gating Noise gating is the process of removing unwanted sounds froma signal by attenuating all signals below a set threshold As described above the gate works independent of the audio signal after being triggered by the signal crossing the gate threshold The gate will remain open as long as the signal is above the threshold How fast the gate opens to let the good signal through is determined by the attack time How long the gate stays open after the signal has gone below the threshold is determined by the hold time How fast the gate closes is determined by the release The range determines how much the gate attenuates the unwanted signal while closed Patching Using a Patch Bay When using a patch bay to extend the GTX44 s patch panel for easier ac
11. he specific period of this limited warranty shall be that which is described to the original retail purchaser by the authorized PreSonus dealer or distributor at the time of purchase PreSonus does not however warrant its products against any and all defects 1 arising Out of materials or workmanship not provided or furnished by PreSonus or 2 resulting from abnormal use of the product or use in violation of instructions or 3 in products repaired or serviced by other than authorized PreSonus repair facilities or 4 in products with removed or defaced serial numbers or 5 in components or parts or products expressly warranted by another manufacturer PreSonus agrees through the applicable authorized distributor to repair or replace defects covered by this limited warranty with parts or products of original or improved design at its option in each respect if the defective product is shipped prior to the end of the warranty period to the designated authorized PreSonus warranty repair facility in the country where purchased or to the PreSonus factory in the U S in the original packaging ora replacement supplied by PreSonus with all transportation cost and full insurance paid each way by the purchaser or owner All remedies and the measure of damages are limited to the above services It is possible that economic loss or injury to person or property may result from the failure of the product However even if PreSonus has been advised of this possibility
12. ibility by using a high cut filter to filter out the high frequencies of the cymbals The gate will no longer open up during cymbal crashes leaving the low frequencies of the tom tom to properly open the gates Threshold The gate threshold sets the level at which the gate opens Essentially all signals above the threshold setting are passed through unaffected whereas signals below the threshold setting are reduced in level 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 example a 2 1 expansion ratio attenuates a signal 1dB for every 1dB it drops below the threshold Ratio s 4 1 and higher act like a noise gate Note The Range Control overrides the ratio control For example If the Expander calls for 40dB of attenuation but the Range is set to 20 dB of attenuation the signal will be attenuated by 20dB Range The range is the amount of gain reduction that the processor closes down to Therefore if the range is set at OdB there will be no change in the signal as it crosses the threshold If the range is set to 60dB the signal will be attenuated reduced by 60dB etc Attack The gate attack time sets the rate at which the gate opens A fast attack rate is crucial for percussive instruments whereas signals such as vocals and bass guitar require a slower attack Hold Hold time is
13. the sidechain signal is raised internally The main audio path is not affected only the processing level is When the switch is in the 4 position the signal is not changed since this matches the internal sidechain operating level of your GTX44 The 4 10 does not change the audio level through the GTX44 It is important to remember that Pro Gear has a hotter 4 level whereas consumer gear runs at the lower level of 10 Sidechain It is sometimes 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 signal in effect triggering the gate to open For example a bass guitar gate might be triggered using the kick drum to tighten up the low end of a mix Or a snare track might be triggered using a click track or sequencer to place the snare right in time with the music 2 7 POWER Power Connection The power jack on your GTX44 accepts a standard IEC cord like those found on most computers and professional recording equipment Your GTX44 contains a custom built in power supply no wall wart This way you can be assured of clean power combined with rugged construction that has been designed to last Power Switch ON 0 OFF 3 1 BASIC IDEAS AND APPLICTIONS Why Do You Need Noise Gates Problems arise when there is noise or instruments in the background of the vocal mic that became
14. this limited warranty does not cover any such consequential or incidental damages Some states or countries do not allow the limitations or exclusion of incidental or consequential damages so the above limitation may not apply to you Any and all warranties express or implied arising by law course of dealing course of performance usage of trade or otherwise including but not limited to implied warranties of merchantability and fitness for a particular purpose are limited to a period of two years from either the date of original retail purchase or in the event no proof of purchase date is available the date of manufacture Some states or countries do not allow limitations on how long an implied warranty last so the above limitations may not apply to you This limited warranty gives you specific legal rights and you may also have other rights which vary from state to state country to country PreSonus Audio Electronics Inc 7257 Florida Blvd Baton Rouge LA 70806 225 216 7887 www presonus com Table of Contents Lil 1 2 2 1 2 2 2 3 2 4 2 5 Overview Introduction Features Controls amp Connections Front Panel Basic Layout Gate Expander Controls Bypass amp Link Patch Panel Power Basic Setup amp Applications Basic Applications Technical Specifications Troubleshooting 1 1 INTRODUCTION Thank you for purchasing the PreSonus GTX44 four channel dynamics processor This processor was designed using state
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