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Table of contents for the manual
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Page 1
User's Manual COMPRESSOR /LIMITER /GA TE ACL2 PRO[...]
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1 SAFETY RELATED SYMBOLS CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN This symbol, wherever used, alerts you to the pre- sence of un-insu lated an d dangerous vol tages with- in the product enclosure. These are voltages that may be sufficient to constitu te the risk of elect ric shock or death. Protective Ground Terminal AC mains (Alternating Current[...]
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PREFACE Dear Customer: Thanks for choosing L TO ACL2 PRO Compressor/Limter/Gate and thanks for choosing one of the results of L TO A UDIO TEAM job and researches. For our LTO AUDIO TEAM , music and sound are more than a job... are first of all passion and let us say... our obsession! We have been designing professional audio products for a long tim[...]
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TABLE OF CONTENTS 1. INTRODUCTION...................................................................................................................................... 4 2.1 Some technical stuff 2. THE CONCEPT BEHIND........................................................................................................................ 4 2.2 V oltag[...]
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1. INTRODUCTION Y ou are now the Owner of an LT O ACL 2 PRO Compressor/Limiter/Gate. The ACL2 PRO is a very powerful dynamic processor. We ha ve included in it with several innovative circuit designs that make the ACL2 PR O a very versatile processor: smart and fast recognition of the program, adjustable Expander/Gate and very low distortion Volt a[...]
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5 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 [...]
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6 2.1.4 More about noise: Expanders and Noise-Gates A lot of ins truments such as microphones, amplifiers, guitar pickups, etc generate some noise, either at low Pic. 1 Front Panel of The A CL2 PRO When engaged, the Master channel (channel 1) will take control of both channels and override all the controls and switches of channel 2 with the excepti[...]
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Page 8
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. 6. Threshold LED These LED's will show you t[...]
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Pic. 4 Controls of the Peak Limiter section 20. Threshold Control The threshold level of the Peak Limiter is adjusted by this control. 21. Limiter LED This Led will light up when the Limiter function is activated. 20 8 11. Outp ut Gain Control Through this control you can vary the output signal by a maximum of 20dB. In this way you can recover the [...]
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THIS IS SET FOR 110V AC TO 120V AC OPERATION THIS IS SET FOR 220V AC TO 240V AC OPERATION 220-240V 110 -120V 1 10-120V 220-240V 3.4 Connectors on The Rear Panel Pic. 5 The Rear Panel of The ACL2 PRO 22. Fuse holder / Voltage Selector This is a dual voltage unit. Before you attempt to connect and operate the unit, please make sure that your local vo[...]
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10 27. Sidechain Send Through this 1/4" unbalanced jack the audio signal can be routed to an external processor . 28. Sidechain Return The return signal of an external processor will be processed through this 1/4" jack. 4. READY TO ROLL? 4.1 Expander/Gate Section Chart. 3 Function of an expander Chart. 4 SRC Curve characteristics of the A[...]
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11 4.2.2 Ratio control This control sets the change of input level to output level but only for the signals that exceed the threshold. The scale of the ratio control on the front panel (calibrated in dB) indicates how much input level is required to increase the output level by 1 dB. If you have a ratio equal to 1:1 you will get the same level of i[...]
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Chart . 7 SGC characteristic of the limiter section 5. INSTALLATION AND CONNECTION 5.1 Mains Connection ACL2 PRO is provided with dual voltage plug. Y ou must check the power supply V oltage available in your Country before connecting the power cord in the wall outlet. Please see Page9, paragraph 22 for further info. 5.2 Audio conn ection The ACL2 [...]
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13 a. 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. XLR Type Balanced Tip Ring Sleeve Tip Ring Sleeve Tip Sleeve[...]
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Send Return Tip Ring Sleeve 14 1/4" TRS insert Insert Leads 5.3 Rack Mounting The most secure mounting is on a universal rack shelf available from various rack manufactures or your music dealer. The ACL2 PRO Compressor /Limiter /Gate fits into one standard 19" rack unit of space. Please allow at least an additional 4" depth for the c[...]
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15 AUDIO INPUT AUDIO OUTPUT SC RETURN SC SEND EXPANDER/GA TE SECTION Smart knee control compressor 6. TECHNICAL SPECIFICA TIONS Type Impedance Maximum input level Type Impedance Maximum output level Bandwidth THD +N% IMD Noise Crosstalk Type Impedance Maximum input level Type Impedance Maximum output level Type Threshold Ratio Type Threshold Ratio [...]
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INDICATORS POWER SUPPLY DIMENSIONS WEIGHT POWER CONSUMPTION GAIN REDUCTION: 12 element LED INPUT / OUTPUT LEVEL: 8 element LED EXPANDER/GA TE THRESHOLD: 2 element LED ( under"+" above"-") COMPRESSOR THRESHOLD: 3 element LED ( under"+" smart "0" above"-" ) PEAK LIMITER THRESHOLD: 1 element LED (Limit[...]
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17 7. WARRANTY 1. WARRANTY REGISTRA TION CARD T o 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 Ca rd gives the manufacturer a better understanding of the sales status, so as to purport a mor[...]
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SEKAKU ELECTRON INDUSTRY (H.K.) CO. L TD. No.1, Lane 17, Sec. 2, Han Shi West Road, Taichun g, 401 TAIW AN http://www.altoproaudio.com T el:886-4-22313737 email: alto@altoproaudio.com Fax:886-4-22346757 All rights reserved to AL TO. All features and content might be changed without prior notice. Any photocopy , translation, or reproduction of part [...]