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CONTROLS & CONNECTIONS 

 

10 

 

2.4 Gain 
 

 

Gain 

 
When compressing a signal, 

Gain 

reduction usually results in an overall reduction of 

level. The 

Gain 

control allows you to restore the loss in level which occurs due to the 

amount of compression used. (like readjusting the volume.) 

 
2.5 Bypass & Link 
 

 

Bypass 

 
Activating the 

Bypass 

effectively removes 

all 

processing being performed by your ACP-

88 and returns the signal to 

unity gain

. You should use 

Bypass 

often when setting up 

your ACP-88 to compare the ‘

before and after

’ results of the signal processing effecting 

your audio signal. 

Bypass 

affects both the 

Gate 

and the 

Compressor

. When 

Bypassed

, the 

Link 

function is interrupted for that channel and essentially breaks the 

link in your linking ‘

chain

’. 

 

 

Link 

 

When the 

Link 

button is engaged (

pushed in

) the LED labeled 

LINK 

becomes active 

indicating this channel has become the 

slave 

of the channel to its immediate 

left 

(The 

Link LED 

is only 

active 

when the signal is present in the 

Linked  channel

). All of the 

controls for the 

Linked 

channel become 

disabled 

and metering occurs by way of the 

Gain reduction 

meter of the channel to the left (

Exception

: the LED meter of the 

Slaved 

channel is still useful to indicate the presence or lack of signal). Essentially, the 

left 

channel is still the 

Master 

and the channel with the 

Link 

button pushed 

in 

is the 

Slave 

channel in a 

stereo linked pair

. If multiple 

Link 

buttons are pushed 

in

, then the 

channel farthest to the 

left 

of the multiple 

Linked 

channels (without its link button pushed 

in) becomes the 

Master 

for the multiple 

Linked 

channels. In this case, all metering 

should be referred to the 

Master 

channel’s meter. 

 
*IMPORTANT: When a channel is Linked (link button pushed in), all of it’s controls 
are inactive. The Link LED is active. Also, even though the meters on the Linked 
channel are still operational

 

 (presence or lack of signal), all metering should be 

referred to the Master channel’s meter for the Gain reduction level of the Linked 
channels! 

Summary of Contents for ACP88

Page 1: ...ACP88 Eight Channel Compressor Limiter Gate User s Manual Version 1 2 Copyright 1998 2000 2001 2007 PreSonus Audio Electronics Incorporated All rights reserved...

Page 2: ...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...

Page 3: ...Connections 2 1 Front Panel Basic Layout 4 2 2 Compressor Controls 5 2 3 Gate Controls 8 2 4 Gain 10 2 5 Bypass Link 10 2 6 Patch Panel 11 2 7 Power 13 3 Basic Setup and Applications 3 1 Patching 15 3...

Page 4: ...found in studio or live sound systems We urge you to scan this manual before hooking up your ACP 88 to become familiar with its features and various applications Good luck and enjoy your ACP 88 1 2 F...

Page 5: ...ile channels 1 2 and 6 remain available for independent applications such as compression limiting or gating as the situation dictates Separate Bypass and Gain for Every Channel Each Channel has a sepa...

Page 6: ...and Outputs Your Acp 88 accepts either balanced or unbalanced inputs and outputs using tip ring sleeve TRS connectors 4dBu or 10dBV The internal operating level of your ACP 88 can be switched between...

Page 7: ...Panel Basic Layout Notice that the front panel is divided into eight identical sections These are the eight signal processing chains of the ACP 88 Each channel contains Compressor Limiter Noise Gate...

Page 8: ...utput level versus the input level For example if you have the Ratio set to 2 1 any signal level above the Threshold setting will be compressed at a compression ratio of 2 1 This simple means that tha...

Page 9: ...for compression Release Release sets the length of time the compressor takes to return the Gain reduction back to zero no gain reduction Very short Release times can produce a very choppy or jittery s...

Page 10: ...reduction applied to the signal occurs as soon as the signal exceeds the level set by the threshold With Soft knee compression the onset of gain reduction occurs gradually after the signal has exceede...

Page 11: ...is advisable to use slower Attack times when gating vocals or quieter instruments to avoid what is often described as gate clicking This phenomenon is not made by a mechanical device in the noise gat...

Page 12: ...ld 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 may cause chattering in percussive...

Page 13: ...immediate left The Link LED is only active when the signal is present in the Linked channel All of the controls for the Linked channel become disabled and metering occurs by way of the Gain reduction...

Page 14: ...CONNECTIONS 11 2 6 Patch Panel Back Input The Input jack accepts balanced tip ring sleeve or unbalanced tipsleeve connectors The Input can handle up to 24 dBu unbalanced or up to 18 dBu balanced signa...

Page 15: ...e amount of Gain reduction to apply When no connector is inserted into this jack the input signal goes directly to the compressor s control circuitry When a connector is inserted into this jack the si...

Page 16: ...t is not uncommon for condensation to form a film on these contact points Failure to clean these inserts can result in a loss or degradation of signal Should a gate or compressor fail inserting a inch...

Page 17: ...BASIC SETUP APPLICATIONS 15 3 1 Patching Inserting into your mixers insert points...

Page 18: ...BASIC SETUP APPLICATIONS 16 Between multi track recorder inputs outputs to mixer outputs inputs unbalanced...

Page 19: ...hat the input level of the compressor is stable Remember adjusting the signal level being sent to the ACP 88 will require a readjustment of the various parameters of the compressor Turn the Threshold...

Page 20: ...se knob to about the middle position set the Gate Range to 60dB Range Button pushed in adjust the Gate Threshold slowly clockwise until you begin to hear those other drums disappearing Too high of a T...

Page 21: ...chain 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 such as 2kHz to 8kHz the...

Page 22: ...BASIC SETUP APPLICATIONS 20 Notes...

Page 23: ...r 60dB Input Impedance 10kOhms Output Impedance 5I 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 Reduct...

Page 24: ...TECHNICAL 22 4 2 Block diagram...

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