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Related Manuals for Alto ACL2 Pro
Summary of Contents for Alto ACL2 Pro
- Page 1 User's Manual ACL2 PRO COMPRESSOR /LIMITER /GATE...
- Page 2 SAFETY RELATED SYMBOLS CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN This symbol, wherever used, alerts you to the pre- sence of un-insulated and dangerous voltages with- in the product enclosure. These are voltages that may be sufficient to constitute the risk of electric shock or death.
- 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
You are now the Owner of an processor. We have included in it with several innovative circuit designs that make the ACL2 PRO a very versatile processor: smart and fast recognition of the program, adjustable Expander/Gate and very low distortion Voltage Control Amplifier (VCA). - 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
5. Threshold Control This control adjusts the threshold level for the Compressor section in the range of -40dBu to +20dBu. The SKC (Smart Knee Control) is applied to the audio signal, which is a maximum of 10dB above the set threshold. Above such level (10dB) a hard knee compression will be applied. -
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
The Input / Output Level Meter (18) is referenced automatically to the selected level, i.e. an optimum operating range of the meter will always be ensured. Pic. 5 The Rear Panel of The ACL2 PRO 220-240V 220-240V... -
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
4.2.8 Gain Reduction Meter This consists of 12 LED on the front of the ACL2 PRO. Through this Led meter you can visualise the amount of gain reduction at any given time. Chart. 6 The effect of a compressor can be expressed as the amount of gain reduction that is taking place for any given input 4.3 Peak Limiter Section... - 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 For XLR connector XLR Type Unbalanced b. In Line Connection Please see following drawing for details.
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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 on high temperature devices such as power amplifiers etc. -
Page 16: Technical Specifications
6. TECHNICAL SPECIFICATIONS AUDIO INPUT AUDIO OUTPUT SC RETURN SC SEND EXPANDER/GATE SECTION Type Active balanced XLR and 1/4"JACK Impedance Balanced: 50K Ohm Operating Level Maximum input level Balanced and Unbalanced: +21 dBu CMRR Type XLR and 1/4" JACK Impedance Balanced: 60 Ohm Maximum output level +21 dBu... - 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 POWER SUPPLY 95-120V/ 210-240V, 60-50Hz...
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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 SEKAKU ELECTRON INDUSTRY (H.K.) CO. LTD. No.1, Lane 17, Sec. 2, Han Shi West Road, Taichung, 401 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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