Alesis 3630 Compressor Reference Manual

Alesis 3630 Compressor Manual

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  • Alesis 3630 Compressor | Reference Manual - Page 1
    Reference Manual 2002
  • Alesis 3630 Compressor | Reference Manual - Page 2
    this product: 1. Read these instructions. 2. Keep these instructions. 3. Heed all warnings. 4. Follow all instructions. 5. Do not use this consult an electrician for replacement of the obsolete outlet. 10. Protect the power cord from being walked on or pinched, particularly at plugs, convenience
  • Alesis 3630 Compressor | Reference Manual - Page 3
    Important Safety Instructions 12. Use only with a cart, stand, bracket, or table designed 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 the power-supply cord or plug is damaged,
  • Alesis 3630 Compressor | Reference Manual - Page 4
    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'int
  • Alesis 3630 Compressor | Reference Manual - Page 5
    Important Safety Instructions 12. N'utilisez qu'avec un stand, ou table conçus pour l'utilisation d'audio professionnel ou instruments de musique. Dans toute installation, veillez de ne rien endommager à cause de câbles qui tirent sur des appareils et leur support. 13. Débranchez l'appareil lors d'
  • Alesis 3630 Compressor | Reference Manual - Page 6
    Important Safety Instructions Lesen Sie bitte die folgende Sicherheitshinweise (German) Sicherheit Symbole verwendet in diesem Produkt Dieses Symbol alarmiert den Benutzer, daß es wichtige Funktionieren und Wartung Anweisungen
  • Alesis 3630 Compressor | Reference Manual - Page 7
    Important Safety Instructions 12. Verwenden Sie ausschließlich Wagen, Ständer, oder Tische, die speziell für professionelle Audio- und Musikinstrumente geeignet sind. Achten Sie immer darauf, daß die jeweiligen
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    at: http://www.alesis.com FCC Compliance Statement limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions
  • Alesis 3630 Compressor | Reference Manual - Page 9
    Hooking Up Power 4 Front Panel Compressor / Limiter Controls 4 Front Panel Compressor / Limiter Switches 7 Front Panel Noise Gate Controls 8 Front Panel Metering 9 Side Chain Applications 10 Troubleshooting 13 Specifications 14 APPENDIX: About Compression, Limiting, and Noise Gating ......15
  • Alesis 3630 Compressor | Reference Manual - Page 10
    INTRODUCTION Thank you for purchasing the Alesis 3630 Dual Channel Compressor/ Limiter with Gate. This cost-effective gain control device complements any studio with several important features. For more information on the significance of these features, refer to the Appendix "About Compression and
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    level signals to be limited, compressed, or gated. These outputs can be a stereo pair or individual mono outputs from mixing consoles, crossovers, tape recorder channels, synthesizers, and other unbalanced signal sources. Microphones and guitars can be used with the level switch set to -10dBV (see
  • Alesis 3630 Compressor | Reference Manual - Page 12
    processors or "keying" from other signal sources. See section 1.8 for side chain applications. Output Provides the processed (compressed/limited/gated input/output meter references signals. When set to the +4 dBu position, a 4 dBu input signal reads 0 dB on the input/output meter. When set to the -
  • Alesis 3630 Compressor | Reference Manual - Page 13
    AC adapter output in here. Use only the AC adapter supplied with the 3630; use of any other AC adapter will void your warranty. To prolong the AC adapter's life, unplug it when not in use (turning the 3630's power switch to off is not sufficient to disconnect the AC adapter from AC power). Alesis
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    higher level and reducing the amount of compression or limiting. Ratio (1:1 to ∞:1) Sets the compression slope, which determines how the output 1dB output change (i.e., there is no change to the signal dynamics). With a setting of ∞:1, the output level remains virtually constant regardless of input
  • Alesis 3630 Compressor | Reference Manual - Page 15
    kicks in. With slower attack times, the limiter responds more to average signal level. This produces a smoother sound that tends to retain dynamic character, but the tradeoff is that the 3630 cannot react as rapidly to sudden level shifts. Examples: Setting a longer attack time with guitar allows
  • Alesis 3630 Compressor | Reference Manual - Page 16
    LEDs will turn off), the limiter circuitry is switched out of the signal path so you can hear the unprocessed sound. In the Comp position, the 3630 processes the input signal. Note: The 3630 must be powered up to pass a signal with either switch setting. Stereo Link Switch In stereo operation
  • Alesis 3630 Compressor | Reference Manual - Page 17
    stereo mode, the compressor and gate control signals are derived from a combination of Channel A and Channel B inputs. Compression and gating are not soley please refer to Section 1.8. 1.6 FRONT PANEL NOISE GATE CONTROLS The noise gate will not pass signals below the specified threshold setting, but
  • Alesis 3630 Compressor | Reference Manual - Page 18
    to gate closed setting. Shorter settings provide maximum hiss reduction but tend to create a "choppier" sound. Longer settings gain a smoother response at the expense of possibly letting a little hiss come through after the input signal dips below the threshold. 1.7 FRONT PANEL METERING The 3630
  • Alesis 3630 Compressor | Reference Manual - Page 19
    the time set by the noise gate Rate control. Since either the Open or Close LED will be on at all times, these also serve as power-on to send the 3630's control signal out for processing. For frequency-dependent limiting applications that involve plugging into another signal processor, a special
  • Alesis 3630 Compressor | Reference Manual - Page 20
    of that channel from the compressor/gate control circuitry. Ducking. The signal at the sidechain's input (lead instrument or vocal) triggers the 3630, causing the stereo signal present at the inputs (background music) to be limited only when the lead instrument or vocal is present Voice using
  • Alesis 3630 Compressor | Reference Manual - Page 21
    2 kHz to 10 kHz. Setup for de-essing is quite easy. With a graphic equalizer, select a frequency (2K for example), and set up an excessive boost (as much as 12dB). If the chosen frequency is correct, the excessive gain at that frequency will trigger the compressor when overly sibilant passages occur
  • Alesis 3630 Compressor | Reference Manual - Page 22
    1.9 TROUBLESHOOTING Noisy or "squeezed" sound- Too low a limiting threshold and/or too high a compression ratio can result in such problems as squeezed, unnatural sounds or excessive noise. Remember, limiting lowers the input signal's dynamic range. If the input signal has a dynamic range of 60 dB
  • Alesis 3630 Compressor | Reference Manual - Page 23
    gate as explained in Section 1.6, under Threshold. Gate "chatters"- Reduce Threshold level and/or increase Rate control until a smooth transition occurs. 1.10 3630 SPECIFICATIONS Dynamic dB compression, any switch setting, nominal attack and Power Requirements: External 9 VAC transformer (supplied
  • Alesis 3630 Compressor | Reference Manual - Page 24
    tape saturation or restricting the dynamic range of program material for broadcast applications. (Note: Some of the following is adapted with permission from the book Guitar Gadgets, written by Craig Anderton and copyright 1983 by Amsco Publications.) Limiting A limiter does not affect the signal
  • Alesis 3630 Compressor | Reference Manual - Page 25
    AMPLITUDE VS. TIME However, the maximum peak signal level has gone from 100 in the first drawing to 50 in the second drawing. Therefore, the overall signal sounds softer. By adding output gain, we can give the limited signal a peak value of 100 again. AMPLITUDE VS. TIME 16
  • Alesis 3630 Compressor | Reference Manual - Page 26
    signal level as possible. Radio and TV stations also use limiting to cope with the medium's limited dynamic range. If the limiter's clamping action occurs abruptly-in other words, the limiter goes from no limiting to full limiting at the threshold point-the sound's output level will not increase
  • Alesis 3630 Compressor | Reference Manual - Page 27
    every little nuance of music, the sound can be overly "choppy." Often, you'll want the limiter to affect dynamic range over a somewhat longer period of time. The Release control sets this time period. Clamping a signal too rapidly can greatly reduce a transient, producing a somewhat dull sound. The
  • Alesis 3630 Compressor | Reference Manual - Page 28
    Noise Gating To understand a gate's principle of operation, consider a "manual noise gate." Suppose you're listening to the volume up again. A noise gate performs a similar function, but automatically. You set a particular noise gate threshold, and the gate compares the input signal level to that
  • Alesis 3630 Compressor | Reference Manual - Page 29
  • Alesis 3630 Compressor | Reference Manual - Page 30
    authorized Alesis service representative in the country of sale. For warranty information in all other countries please refer to your local distributor. For more effective service and product update notices, please register your 3630 Compressor online at: http://www.alesis.com/ support/warranty
  • Alesis 3630 Compressor | Reference Manual - Page 31
    mail: Website: [email protected] http://www.alesis.com Alesis 3630 Compressor Reference Manual Revision 1.1 by Brooks Bruner Copyright 2002, Alesis Distribution, LLC. All rights reserved Reproduction in whole or in part is prohibited. "3630 Compressor" is a trademark of Alesis Distribution, LLC
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2002