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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 abuse, 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. The 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 
or a 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, 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 

 

 
 
 

©1997, PreSonus Audio Electronics, Incorporated. All rights reserved. 

 

Summary of Contents for ACP-22

Page 1: ...ACP 22 Two Channel Stereo Compressor Limiter Gate User s Manual VERSION 1 1 ...

Page 2: ...ease 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 The specific period of this limited warranty shall be that which is described to the original retail purchaser by the authorized PreSonus...

Page 3: ... Connections 2 1 Front Panel Basic Layout 2 2 Compressor Controls 2 3 Gate Controls 2 4 Gain 2 5 Bypass Link 2 6 Patch Panel 2 7 Power 3 Basic Setup Applications 3 1 Some Basic Patching 3 2 Basic Applications 4 Technical 4 1 Specifications A Appendix A word about compression ...

Page 4: ...TOC Intentionally Blank ...

Page 5: ...ressors Limiters Both channels of your ACP 22 contains an audio compressor that can also be setup as a limiter by varying the ratio of compression You have broad control over threshold ratio attack and release for each processor You can select between auto or manual attack and release curves and hard or soft knee compression types refer to the application section of this manual for a quick tutoria...

Page 6: ...king tracks behind a narrator for auto mixing a service broadcast or performance When both channels are linked together the send of the sidechain jack of the master channel contains a mix of both the channels in the link a cool feature that allows for control over both channels of processing with one sidechain send return See the section on sidechaining for application notes Separate Gate Keying J...

Page 7: ...Overview 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 ...

Page 8: ...sor Limiter Noise Gate Gain output control Link Bypass Control 2 2 Compressor Controls Threshold The Compressor threshold sets the level at which the onset of compression begins When the signal is above the threshold setting it becomes eligible for compression Turning the threshold knob counter clockwise causes more of the input signal to become compressed if you have a ratio setting of greater th...

Page 9: ...r acts on the input signal A slow attack time fully clockwise allows the beginning envelope of a signal commonly referred to as the initial transient to pass through the compressor uncompressed whereas a fast attack time fully counter clockwise subjects the signal to the ratio and threshold settings of the compressor instantaneously The Attack control is only active when the Auto button is not pus...

Page 10: ...s the level set by the threshold With soft knee compression the onset of gain reduction occurs gradually after the signal has exceeded the threshold producing a more musical response to some folks Auto When pushed in the auto button places the compressor in automatic attack and release mode The attack and release knobs become inoperative and a pre programmed attack and release curve is used 2 3 Ga...

Page 11: ...e must be taken especially with regards to percussive instruments to avoid gate chatter Longer release times usually eliminate chattering and should be set by listening carefully for the most natural release of the signal to which the gate is being applied Range The gate range button sets the amount of gain reduction occurring when the gate closes Therefore if the range button is pushed in led on ...

Page 12: ...all processing being performed by your ACP 22 and returns the signal to unity gain You should use bypass often when setting up your ACP 22 to compare the before and after results of the signal processing effecting your audio signal Bypass affects both the gate and the compressor When in Bypass the Link function is interrupted and defeats the stereo link Link When the Link button is pushed in chann...

Page 13: ...ectors or balanced XLR connectors The input can handle up to 24dBu unbalanced or up to 18dBu balanced signal levels Output The output jacks accept balanced XLR or unbalanced tip sleeve connectors The output will deliver up to 24dBu in signal level balanced or unbalanced Cable Connection Diagrams ...

Page 14: ...Gating Sidechain The sidechain jack on each channel interrupts the signal that the compressor and or gate is using to detect the audio signal for processing When no connector is inserted into this jack the input signal goes directly to the compressors control circuitry normaled When a connector is inserted into this jack the signal path is broken If you have inserted a tip ring sleeve connector th...

Page 15: ...m built in power supply no wall wart We can t stand them either This way you can be assured of clean power combined with rugged construction that has been designed to last Power Selection Before powering on your ACP 22 for the first time be sure to check the position of the power selector Make certain that the power voltage level selected matches that of your country s outlet Power Switch I ON 0 O...

Page 16: ...Controls Connections Notes ...

Page 17: ...Basic Setup Applications 3 1 Some Basic Patching Inserting into your mixers insert points unbalanced After your mixers main outputs balanced ...

Page 18: ...Basic Setup Applications Between multi track recorder inputs outputs to mixer outputs inputs unbalanced Sidechain insertion of an equalizer for de essinq specific frequency gating applications ...

Page 19: ...has an insert point insert the compressor there If you don t have an insert point you will have to place the compressor after your mixer s bus output or whichever output you re using by coming out of your mixer to the input of the ACP 22 then out of the ACP 22 to the input of your recorder If you re using a stand alone mic preamp patch the ACP 22 after the preamp and then to the recorder Turn the ...

Page 20: ...ercussion instruments Limiting the dynamic range of a drum kit may or may not be something you want to do to your drum tracks but there are some other cool things the ACP 22 can do to make your drums really happening If you think about how a snare drum sounds it has a beginning loud sound followed by a usually short decay Patch a channel of your ACP 22 for compressing the snare drum as described a...

Page 21: ...ing for the level of a signal On your ACP 22 limiting occurs when the ratio knob is fully clockwise At this point the threshold knob essentially becomes the ceiling knob for the channel You will most likely want an instantaneous attack time while limiting To achieve this Make sure the auto button is out Turn the attack time knob fully counter clockwise and set the compressor s release time for the...

Page 22: ... of the spare channel and send it to the sidechain input of the ACP 8 signal on the ring of the tip ring sleeve connector Once patched setup the compressor as a limiter as described above How this works is that when the sidechain has an inserted signal the compressor generates the gain reduction from the sidechain return signal only Now if you boost those frequencies associated with sibilance SSS ...

Page 23: ...Basic Setup Applications will eliminate all gain reduction and effectively turn off the gain reduction meters The gain reduction is of course being derived from the master channel ...

Page 24: ... to 60dB Input Impedance 10kOhms Output Impedance 51 Ohms THD Noise 0 02 Output Gain 20dB to 20dB Compression Curve Types Soft Knee or Hard Knee Compressor Metering Above and Below Threshold Gain Reduction Gate Metering Open and Closed Sidechain Output Impedance 51 Ohms Sidechain Input Impedance 10kOhms Gate Input Impedance 10kOhms Internal Operating Level 4dBu 0dB Input Range 4dBu or 10dBV Switch...

Page 25: ...or vocal making it easier to record without distorting the recorder It also assists in the mixing process by reducing the amount of level changes needed for a particular instrument Take for example a vocalist who moves around in front of the microphone while performing thus making the output level vary up and down unnaturally A compressor can be applied to the signal to help correct this recording...

Page 26: ...has a wide dynamic range Transients the very loudest portion of the signal can be far outside the average level of the vocal signal It is extremely difficult to ride the level with a console fader A compressor limiter automatically controls gain without altering the subtleties of the performance A solo guitar can seem to be masked by the rhythm guitars Compression can make your lead soar above the...

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