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Alto ACL4 User Manual

Quad compressor/limiter
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User's Manual
ACL4
QUAD COMPRESSOR/LIMITER
R
LTO
www.altoproaudio.com
Version 1.1 September 2005
English

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Summary of Contents for Alto ACL4

  • Page 1 User's Manual ACL4 QUAD COMPRESSOR/LIMITER www.altoproaudio.com Version 1.1 September 2005 English...
  • Page 2 SAFETY RELATED SYMBOLS Fuse To prevent fire and damage to the product, use only the recommended fuse type as indicated in this CAUTION manual. Do not short-circuit the fuse holder. Before RISK OF ELECTRIC SHOCK DO NOT OPEN replacing the fuse, make sure that the product is OFF and disconnected from the AC outlet.
  • Page 3 LTO ACL4 is the result of many hours of listening and tests involving common people, area experts, musicians and technicians. The results of this effort is that you can acquire an extremely efficient and universal dynamics processor.

  • Page 4: Table Of Contents

    TABLE OF CONTENTS 1. INTRODUCTION............................4 2. THE CONCEPT BEHIND........................4 2.1 Some technical stuff 2.2 Voltage Controlled Amplifier (VCA) 2.3 Inputs 3. CONTROL ELEMENTS .........................6 READY TO ROLL? ..........................7 4.1 Compressor Section 4.2 Peak Limiter Section 5. INSTALLATION AND CONNECTION.....................9 ..5.1 Mains Connection 5.2 Audio Connection 5.3 Rack Mounting...

  • Page 5: Introduction

    Thanks to the AUTO function attack and release times of the program materials are automatically analysed in your ACL4 unit. Then the dynamic range of the program is heavily compressed in a very musical way so that there will not be any audible breathing or pumping effect.

  • Page 6: Voltage Controlled Amplifier (Vca)

    2.2 Voltage Controlled Amplifier (VCA) The VCA is the soul of the ACL4 and it is one of the best components available today in his category thanks to its excellent performances in terms of distortion, linearity, noise and temperature stability.

  • Page 7: Control Elements

    3. CONTROL ELEMENTS Your ACL4 presents with four channels. Each channel is equipped with the same control elements: 3 push-button switches, 4 rotary controls and 17 LEDs. You can operate in stereo mode via pressing the Couple switch. The details please refer to following content.

  • Page 8: Ready To Roll

    12. Voltage Selector and Fuse holder Please make sure about the voltage available in your Country before connecting the unit to the AC socket. Please consult with a qualified Engineer to change the fuse or to change the AC Voltage operation on the ACL4. 220-240V...
  • Page 9 4.1.5 Gain Control LED Meter This consists of 8 LED on the front of the ACL4. Through this LED Meter you can visualise the amount of gain reduction at any given time. Chart. 4 The effect of a compressor can be expressed as the amount...

  • Page 10: Peak Limiter Section

    Well, life is not that easy for conventional compressor/limiters. Ok you handle an audio signal made by a wide range of frequencies and you have chosen a longer attack time. But, if using your ACL4 as a limiter the fast high frequencies will pass through untouched because the attack time is too slow and such transients could cause distortion when the unit is connected to broadcast devices or taper recorders.

  • Page 11: Rack Mounting

    Please allow at least an additional 4" depth for the connectors on the rear panel. Be sure that there is enough air space around the unit for sufficient ventilation and please do not place the ACL4 Quad Compressor/Limiter on high temperature devices such as power amplifiers etc. to avoid overheating.

  • Page 12: Technical Specifications

    6. TECHNICAL SPECIFICATIONS Type Active balanced XLR and 1/4"JACK AUDIO INPUT Impedance Balanced: 50K Ohm Unbalanced: 25K Ohm Operating Level +4dBu /-10dBV Maximum input level alanced and nbalanced: +21 dBu CMRR >55dB @1KHz Type XLR and 1/4" JACK AUDIO OUTPUT Impedance Balanced: 60Ohm Unbalanced: 30Ohm...

  • Page 13: Warranty

    7. WARRANTY 1. WARRANTY REGISTRATION CARD To obtain Warranty Service, the buyer should first fill out and return the enclosed Warranty Registration Card within 10 days of the Purchase Date. All the information presented in this Warranty Registration Card gives the manufacturer a better understanding the sales status, so as to purport a more effective and efficient after-sales warranty service.
  • Page 14 No. 1, Lane 17, Sec. 2, Han Shi West Road, Taichung 40151, Taiwan http://www.altoproaudio.com Tel: 886-4-22313737 email: alto@altoproaudio.com Fax: 886-4-22346757 All rights reserved to ALTO. All features and content might be changed without prior notice. Any photocopy, translation, or reproduction of part of this manual without written permission is forbidden. Copyright 2005 SEIKAKU GROUP NF01956-1.1...

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