Instruction/ maintenance manual of the product ACL2 Pro Nilfisk-ALTO
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User's Manual COMPRESSOR /LIMITER /GA TE ACL2 PRO.
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.
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.
TABLE OF CONTENTS 1. INTRODUCTION...................................................................................................................................... 4 2.1 Some technical stuff 2. THE CONCEPT BEHIND...................................
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 .
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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 B.
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"-.
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.
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.
An important point after buying a device Nilfisk-ALTO ACL2 Pro (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Nilfisk-ALTO ACL2 Pro yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Nilfisk-ALTO ACL2 Pro - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Nilfisk-ALTO ACL2 Pro you will learn all the available features of the product, as well as information on its operation. The information that you get Nilfisk-ALTO ACL2 Pro will certainly help you make a decision on the purchase.
If you already are a holder of Nilfisk-ALTO ACL2 Pro, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Nilfisk-ALTO ACL2 Pro.
However, one of the most important roles played by the user manual is to help in solving problems with Nilfisk-ALTO ACL2 Pro. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Nilfisk-ALTO ACL2 Pro along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
