Instruction/ maintenance manual of the product BK 2.0 Nilfisk-ALTO
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BK 2.0 User's Manual LTO R R www .altoproaudio.com Version 2.0 Dec. 2002 English English COMPRESSOR /LIMITER /GA TE.
1 SAFETY RELATED SYMBOLS CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN Protective Grounding Make sure to connect the protective grounding to prevent any electric shock before turning ON the apparatus. Never cut off the internal or external protective grounding wire or disconnect the wiring of protective grounding terminal.
2 PREFACE Dear Customer: For our LTO AUDIO TEAM, music and sound are more then a job...are first of all passion and let us say...our obsession! We have been designing professional audio products for a long time in cooperation with some of the major brands in the world in the audio field.
3 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 L TO BK 2.0 Compressor/Limiter/Gate. The B K 2.0 is a very powerful dynamic processor. We have included in it several innovative circuit designs that make t he BK 2.
5 2.1.2 Introducing Audio Dynamics The human ear can detect the noise generating 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 lo ok at Chart.
6 2.1.4 More about noise: Expanders and Noise-Gates A lo t of instruments such as microphones, amplifiers, guitar pickups, etc generate some noise, either at low frequ- encies (hum) or at high frequencies (hiss) Such noise will inevitably interfere with the quality of your audio signal.
7 2.Close LED This LED illuminates when expansion occurs. 4 5 6 8 7 9 3.
8 11. PROCESS control This control renews any high frequencies lost through the compression process for natural sounding dynamics control, which can be varied from off to 6. Please note that the enhancer control is only used when compression is taking place.
9 4. READY TO ROLL? 4.1 Expander/Gate Section Chart.3: Function of an expander As we told you previously in this Manual the downward expander will reduce automatically the level of the audio signal when such signal is below a set threshold. So the expander is t he opposite of the compressor/limiter .
10 4.2.2 Ratio control This control sets the ch ange of input level to o utput level but only fo r the signals that exceed the threshold. The scale of the ratio control on th e front panel (calibrated in dB) indicates how much inpu t level is required to incr ease the output level by 1 dB.
11 5. INSTALLATION AND CONNECTION 5.1 Mains Connection BK 2.0 is provided w ith dual voltage plug. You must check the power supply Vol tage available in your Country before connecting the power c ord in the wall outlet. Please see Page, p aragraph 12 for further info.
12 a. Wiring Configuration Both types of connectors available on BK 2.0 can be wired in balanced and unbalanced modes. Please see following drawing for details: For 1/4" TRS jack For XLR connector 1/4"TRS jack Unbalanced input XLR Unbalanced input XLR Balanced input 1/4"TRS jack Balanced input b.
13 1/4" TRS insert Tip Ring Sleeve Tip (S.
14 AUDIO INPUT AUDIO OUTPUT COMPRESSOR SECTION GATE SECTION DYNAMIC ENHANCER SECTION FUNCTION SWITCHES INDICATORS POWER SUPPL Y DIMENSIONS WEIGHT 6. TECHNICAL SPECIFICA TIONS Active balanced XLR and 1/4"JACK 60k ohm balanced +21 dBu balanced and unbalanced +21 dBu XLR and 1/4" JACK < 40k ohm unbalanced 20Hz to 20KHz at +0,- 1dB 0.
15 7. BLOCK DIAGRAM Chart.8: Block diagram of the BK 2.0.
8. WARRANTY 1. WARRANTY REGISTRA TION CARD T o obtain Warranty Service, the buyer should first fill o ut and return the enclosed Warranty Registration Card within 10 days of the Purchase Date.
SEKAKU ELECTRON IND. CO., LTD NO.1, LANE 17, SEC. 2, HAN SHI WEST ROAD, T AICHUNG, 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 BK 2.0 (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 BK 2.0 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 BK 2.0 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Nilfisk-ALTO BK 2.0 you will learn all the available features of the product, as well as information on its operation. The information that you get Nilfisk-ALTO BK 2.0 will certainly help you make a decision on the purchase.
If you already are a holder of Nilfisk-ALTO BK 2.0, 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 BK 2.0.
However, one of the most important roles played by the user manual is to help in solving problems with Nilfisk-ALTO BK 2.0. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Nilfisk-ALTO BK 2.0 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
