Related Manuals for PRESONUS ACP 88 - V 1.2
Summary of Contents for PRESONUS ACP 88 - V 1.2
- 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 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 breach 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.
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Page 3: Table Of Contents
TABLE OF CONTENTS 1.) Overview 1.1 Introduction ......................... 1 1.2 Features ........................1 2.) Controls & 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....................... -
Page 4: Overview
OVERVIEW 1.1 INTRODUCTION Thank you for purchasing the PreSonus ACP-88 multi-channel dynamics processor. Your processor was designed using state of the art components to deliver crystal clear compression and noise gating for an infinite period of time. We believe the ACP-88 to be an exceptional sounding unit and an exceptional value. - Page 5 OVERVIEW 1. 2 FEATURES (continued) • Eight Dynamic Noise Gates. Each channel of your ACP-88 has a separate dynamic noise gate that can be used to Gate an entire drum kit, clean up a noisy tape machine, isolate an instrument or separate a vocal from background noise.
- Page 6 –10dBV (line levels), making it possible to use in virtually any application. For Technical support please choose from the following options: Phone: 800.750.0323 Email: techsupport@presonus.com Website: www.presonus.com *please visit the PreSonus forums at www.presonus.com/forums to find tips, suggestions and general discussion for all PreSonus products.
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Page 7: Controls & Connections
CONTROLS & CONNECTIONS 2.1 Front 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 • Gain Makeup •... -
Page 8: Compressor Controls
CONTROLS & CONNECTIONS 2.2 Compressor Controls • Threshold The Compressor Threshold sets the level at which compression begins. The below and above LED’s over the Threshold knob indicate whether the input signal is below or above the Threshold setting. When the signal is above the Threshold setting, it becomes ‘eligible’... - Page 9 CONTROLS & CONNECTIONS • Attack Attack sets the speed at which the compressor ‘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 counterclockwise) immediately subjects the signal to the Ratio and Threshold settings of the compressor.
- Page 10 CONTROLS & CONNECTIONS • Soft The Soft button selects Soft Knee and Hard Knee compression curves. When this button is pushed in, Soft knee compression curves are used, otherwise hard knee compression curves are used. With Hard knee compression, the gain reduction applied to the signal occurs as soon as the signal exceeds the level set by the threshold.
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Page 11: Gate Controls
CONTROLS & CONNECTIONS 2.3 Gate Controls • Attack The Gate attack control sets the speed at which the gate opens to allow signal to pass through it. This control is variable from 10 microseconds to 100 milliseconds. It is advisable to use slower Attack times when gating vocals or quieter instruments to avoid what is often described as gate ‘clicking’. - Page 12 CONTROLS & CONNECTIONS • Threshold The gate Threshold sets the level at which the gate opens as indicated by the ‘OPEN’ LED above the Threshold knob. 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 Range switch.
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Page 13: Gain
CONTROLS & CONNECTIONS 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 &... -
Page 14: Patch Panel
CONTROLS & CONNECTIONS 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 signal levels. - Page 15 CONTROLS & CONNECTIONS • Output The output jack accepts balanced tip-ring-sleeve or unbalanced tip sleeve connectors. The output will deliver up to +24 dBu in signal level, balanced or unbalanced. • +4/-10 Switch This switch adjusts the internal operating level of your ACP-88 when it is connected to line level (0 dB = -10 dBU) gear.
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Page 16: Power
CONTROLS & CONNECTIONS drum’s signal with all of the high frequencies rolled off. This set-up could be useful to stop the kick drum’s gate from opening during a cymbal crash, for example. *NOTE: The Key and Sidechain are in the signal path of the gate and compressor, respectively. -
Page 17: Basic Setup And Applications
BASIC SETUP & APPLICATIONS 3.1 Patching • Inserting into your mixers insert points... - Page 18 BASIC SETUP & APPLICATIONS • Between multi-track recorder inputs/outputs to mixer outputs/inputs, unbalanced.
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Page 19: Applications
BASIC SETUP & APPLICATIONS 3.2 Applications • Example setup compressing a voice or vocal track. Probably the most common use of a compressor is to control the dynamic range of a vocalist during a live performance or when recording. It is almost always necessary to compress a vocal take during a recording session. - Page 20 BASIC SETUP & APPLICATIONS If you consider the sound of a snare drum, you will notice the sound has a beginning loud sound (transient) followed by a sound of decreasing intensity (decay). Patch a channel of your ACP-88 for compressing the snare drum as described above and we can explore some dramatic changes that compression can have on the snare drum's sound.
- Page 21 BASIC SETUP & APPLICATIONS • Compressing acoustic guitar. It is sometimes easy to over compress an acoustic guitar because your first impression is that compression sounds awesome on acoustic instruments. If you're adding the acoustic instrument to a mix that already includes a lot of other instruments such as distorted guitar, compressing the life out of your guitar will help you later in the mix.
- Page 22 BASIC SETUP & APPLICATIONS Notes…...
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Page 23: Technical
TECHNICAL 4.1 Specifications Number of Channels.........................8 Dynamic Range ........................>115dB Signal to Noise Ratio ....................... >95dB Headroom ................+24dBu, Unbalanced; +18dBu Balanced Frequency Response ....................10Hz to 50kHz Crosstalk........................>82db @ 10kHz Compression Threshold Range................40dBu to +20dBu Compression Ratio ......................1:1 to 20:1 Compressor Attack Time ..................0.02ms to 200ms Compressor Release Time.................. -
Page 24: Block Diagram
TECHNICAL 4.2 Block diagram...