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Summary of Contents for Alto ACL2 PRO
- Page 1 User's Manual ACL2 PRO COMPRESSOR /LIMITER /GATE 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 ACL2 PRO 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.
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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. CONTROLS............................. 6 3.1 Expander/Gate Section 3.2 Compressor Section 3.3 Peak Limiter Section 3.4 Connectors on The Rear Panel 4. -
Page 5: Introduction
This function also allows you to protect other equipment in the signal loop against distortion. The AUTO Function Your ACL2 PRO includes AUTO function switch on the front panel. Thanks to the AUTO function attack and release times of the program materials are automatically analysed. 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 2.1.2 Introducing Audio Dynamics The human ear can detect the noise generated by falling leaves as well as the roar generated by the taking off space shuttle. Unfortunately no analog, nor digital device can reproduce such wide spectrum. Please look at Chart.1 and you will see the difference when dynamic capacity of various devices compare to the human ear.
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Page 7: Voltage Controlled Amplifier (Vca)
2.2 Voltage Controlled Amplifier (VCA) The VCA is the soul of the ACL2 PRO 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 8: Compressor Section
2. Threshold Control This control adjusts the threshold level for the Expander / Gate Section in the range of Off to +15dBu. Signals below this level cause expansion. 3. Ratio Control This control determines the expansion ratio when the signal drops below the threshold level. The expansion ratio can be set from 1:1.2 to 1:8 (Low ratio for Expander application or 1:8 for Gate application). -
Page 9: Peak Limiter Section
11. Output Gain Control Through this control you can vary the output signal by a maximum of 20dB. In this way you can recover the level lost during the compression process. 12. SC External Switch This switch will sever the connection between the audio input and the sidechain path. But at the same time it will also allow an external signal through the SC return jack present on the rear panel. -
Page 10: Connectors On The Rear Panel
SIDECHAIN CHANNEL 2 CHANNEL 1 Pic. 5 The Rear Panel of The ACL2 PRO 22. Fuse holder / Voltage elector This is a dual voltage unit. Before you attempt to connect and operate the unit, please make sure that your local voltage matches the voltage on the fuse-holder cover. -
Page 11: Ready To Roll
It simply cut-off the entire signal below a certain set threshold. The ACL2 PRO is equipped with a new kind of expander, the SRC (Smart Ratio Control). - Page 12 Anyway, our advice is always to begin the process with longer attack times. Then you can start gradually to reduce the attack time. IN the ACL2 PRO the attack time can be set in a range of 1 to 150 milliseconds.
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Page 13: 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 ACL2 PRO 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 tape recorders. - Page 14 Wiring Configuration Both types of connectors available on ACL2 PRO can be wired in balanced and unbalanced modes. Please see following drawing for details: For 1/4" Phone jack Ring Ring Sleeve Sleeve Sleeve TS Type Unbalanced TRS Type Balanced...
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Page 15: 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 ACL2 PRO Compressor /Limiter /Gate... -
Page 16: Technical Specifications
6. TECHNICAL SPECIFICATIONS Type AUDIO INPUT Active balanced XLR and 1/4"JACK Impedance Balanced: 50K Ohm Unbalanced: 25K Ohm Operating Level +4dBu /-10dBV Maximum input level alanced and nbalanced: +21 dBu >55dB @1KHz CMRR Type AUDIO OUTPUT XLR and 1/4" JACK Impedance Balanced: 60 Ohm Unbalanced: 30Ohm... - Page 17 INDICATORS GAIN REDUCTION: 12 element LED INPUT / OUTPUT LEVEL: 8 element LED EXPANDER/GATE THRESHOLD: 2 element LED ( under"+" above"-") COMPRESSOR THRESHOLD: 3 element LED ( under"+" smart "0" above"-" ) PEAK LIMITER THRESHOLD: 1 element LED (Limiter Function ) Function switch: LED indicator for each 210-240V: T200mAL 250VAC POWER SUPPLY...
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Page 18: 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 of the sales status, so as to purport a more effective and efficient after-sales warranty service. - Page 19 SEIKAKU TECHNICAL GROUP LIMITED 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.
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