Alesis CLX440 User Manual

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Compressor / Limiter / Expander

Reference

Manual

2001

CLX-440Reference Manual

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Contents

Contents........................................................................................................................

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Welcome!.....................................................................................................

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How to Use This Manual .........................................................................

7

Important Safety Instructions..................................................................

8

CE Declaration of Conformity...............................................................

10

Instructions to the User (FCC Notice)..................................................

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Quick Start Guide .....................................................................................................

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If you can't wait to get started:..............................................................

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Step 1: Hook it up to a mixer ........................................................

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Step 2: Try some compression ......................................................

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Step 3: Try some gating..................................................................

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Connections ...............................................................................................................

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Unpacking and Inspection.....................................................................

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Installing in a Rack ..................................................................................

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Power .........................................................................................................

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Connecting inputs and outputs ............................................................

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Connecting to the Channel Inserts of a mixing console: .........

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Connecting to the Main Inserts of a mixing console: ...............

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Connecting to the inserts on an instrument amplifier: ............

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Connecting to equipment with XLR inputs and outputs:.......

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About Audio Cables................................................................................

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Dual Channel Operation ........................................................................

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Basics of Compression ............................................................................................

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What is compression? .............................................................................

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Description of Controls ..........................................................................

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Threshold .......................................................................................

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Ratio ................................................................................................

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Attack..............................................................................................

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Release ............................................................................................

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Detect ..............................................................................................

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Knee ................................................................................................

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Compression Artifiacts...........................................................................

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Pumping and Breathing ..............................................................

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Clicking or "Zipper Noise" .........................................................

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Reduced Gain Structure ..............................................................

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Limiting .....................................................................................................

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Limiter Threshold.........................................................................

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Stereo Detection .......................................................................................

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Look Ahead Compression .....................................................................

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Sidechain ...................................................................................................

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Basics of Expansion.................................................................................................

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What is expansion?..................................................................................

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Description of Controls ..........................................................................

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Threshold .......................................................................................

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Ratio ................................................................................................

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Knee ................................................................................................

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Attack..............................................................................................

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Hold ................................................................................................

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Release ............................................................................................

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Keyed Expansion .....................................................................................

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Applications...............................................................................................................

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Compressor Applications ......................................................................

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Vocal Limiting...............................................................................

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Vocal Compression ......................................................................

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Drums .............................................................................................

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Bass..................................................................................................

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Electric Guitar ...............................................................................

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Compressor Applications using the Sidechain..................................

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De-essing........................................................................................

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Ducking ..........................................................................................

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Expander Applications...........................................................................

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Gating a Noisy Guitar Amp .......................................................

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Expanding Live Vocal Tracks ....................................................

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Expander Applications using the Key.................................................

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Gated Reverb.................................................................................

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Key Filtering for a Tom Mic gate...............................................

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Staccato Gating a Synth Pad.......................................................

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Troubleshooting .......................................................................................................

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Troubleshooting Index ...........................................................................

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Avoiding ground loop noise ......................................................

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Line Conditioners and Protectors .............................................

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Care and Maintenance............................................................................

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Cleaning .........................................................................................

54

Refer All Servicing to Alesis.......................................................

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Obtaining Repair Service ............................................................

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Specifications............................................................................................

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Audio Input .................................................................................

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Sidechain/ Key Inputs...............................................................

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Direct Output...............................................................................

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Audio Output ..............................................................................

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Audio Performance ....................................................................

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Mechanical ...................................................................................

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Alesis Limited Warranty .........................................................................................

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Welcome!

Thank you for making the Alesis CLX-440™a part of your studio. Since 1984, we've been designing and building creative tools for the audio community. We believe in our products, because we've heard the results that creative people like you have achieved with them. One of Alesis' goals is to make highquality studio equipment available to everyone, and this Reference Manual is an important part of that. After all, there's no point in making equipment with all kinds of capabilities if no one explains how to use them. So, we try to write our manuals as carefully as we build our products.

The goal of this manual is to get you the information you need as quickly as possible, with a minimum of hassle. We hope we've achieved that. If not, please drop us an email and give us your suggestions on how we could improve future editions of this manual.

We hope your investment will bring you many years of creative enjoyment and help you achieve your goals.

Sincerely,

The people of Alesis Studio Electronics

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How to Use This Manual

This manual is divided into the following sections describing the various functions and applications for the CLX-440.While it's a good idea to read through the entire manual once carefully, those having general knowledge about studio equipment should use the table of contents to look up specific functions.

Chapter 1: Quick Start. If you're already familiar with recording, this will get you started using theCLX-440right away. It's a short guide to the essential elements of connections and operation.

Chapter 2: Connections. This section gives detailed instructions for connecting theCLX-440to a variety of typical audio systems.

Chapter 3: Basics of Compression. This section explains what a compressor does and explains the function of each of the controls.

Chapter 4: Basics of Expansion. This chapter explains the other major feature of theCLX-440,expansion, and each of the front panel controls dedicated to this function.

Chapter 5: Applications. Skip to this section for tips on using theCLX-440with a variety of audio sources.

Chapter 6: Troubleshooting. Refer to this chapter if you experience any problems while using theCLX-440.

Helpful tips and advice are highlighted in a shaded box like this.

The names of specific controls or connectors on the CLX-440are printed in a special font, i.e., theBYPASS button.

When something important appears in the manual, an icon

(like the one on the left) will appear in the left margin. This symbol indicates that this information is vital when operating the CLX-440.

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Important Safety Instructions

Safety symbols used in this product:

This symbol alerts the user that there are important operating and maintenance instructions in the literature accompanying this unit.

This symbol warns the user of uninsulated voltage within the unit that can cause dangerous electric shocks.

This symbol warns the user that output connectors contain voltages that can cause dangerous electrical shock.

Please follow these precautions when using this product:

1. Read these instructions.

2.Keep these instructions.

3.Heed all warnings.

4.Follow all instructions.

5.Do not use this apparatus near water.

6.Clean only with a damp cloth. Do not spray any liquid cleaner onto the faceplate, as this may damage the front panel controls or cause a dangerous condition.

7.Install in accordance with the manufacturer's instructions.

8.Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.

9. Do not defeat the safety purpose of the polarized or groundingtype plug. A polarized plug has two blades with one wider than the other. Agrounding-typeplug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. When the provided plug does not fit

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into your outlet, consult an electrician for replacement of the obsolete outlet.

10.Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.

11.Use only attachments or accessories specified by the manufacturer.

12.Use only with a cart, stand, bracket, or table designed for use with professional audio or music equipment. In any installation, make sure that injury or damage will not result from cables pulling on the apparatus and its mounting. If a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.

13.Unplug this apparatus during lightning storms or when unused for long periods of time.

14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as when thepower-supplycord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

15.This unit produces heat when operated normally. Operate in a well-ventilatedarea with at least six inches of clearance from peripheral equipment.

16.This product, in combination with an amplifier and headphones or speakers, may be capable of producing sound levels that could cause permanent hearing loss. Do not operate for a long period of time at a high volume level or at a level that is uncomfortable. If you experience any hearing loss or ringing in the ears, you should consult an audiologist.

17.Do not expose the apparatus to dripping or splashing. Do not place objects filled with liquids (flower vases, softdrink cans, coffee cups) on the apparatus.

18.WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.

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Instructions de Sécurité Importantes (French)

Symboles utilisés dans ce produit

Ce symbole alèrte l’utilisateur qu’il existe des instructions de fonctionnement et de maintenance dans la documentation jointe avec ce produit.

Ce symbole avertit l’utilisateur de la présence d’une tension non isolée à l’intérieur de l’appareil pouvant engendrer des chocs électriques.

Ce symbole prévient l'utilisateur de la présence de tensions sur les raccordements de sorties, représentant un risque d'électrocution.

Veuillez suivre ces précautions lors de l’utilisation de l’appareil:

1. Lisez ces instructions.

2.Gardez ces instructions.

3.Tenez compte de tous les avertissements.

4.Suivez toutes les instructions.

5.N’utilisez pas cet allareil à proximité de l’eau.

6.Ne nettoyez qu’avec un chiffon humide. Il est potentiellement dangereux d'utiliser des pulvérisateurs ou nettoyants liquides sur cet appareil.

7.Installez selon les recommandations du constructeur.

8.Ne pas installer à proximilé de sources de chaleur comme radiateurs, cuisinière ou autre appareils (don’t les amplificateurs) produisant de la chaleur.

9. Ne pas enlever la prise de terre du cordon secteur. Une prise murale avec terre deux broches et une troisièrme reliée à la terre. Cette dernière est présente pour votre sécurité. Si le cordon secteur ne rentre pas dans la prise de courant, demandez à un électricien qualifié de remplacer la prise.

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