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Nilfisk-ALTO BK 2.0 - page 1
BK 2.0 User's Manual LTO R R www .altoproaudio.com Version 2.0 Dec. 2002 English English COMPRESSOR /LIMITER /GA TE ...
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Nilfisk-ALTO BK 2.0 - page 2
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. The symbol is used to indica ...
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Nilfisk-ALTO BK 2.0 - page 3
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. The LT O line presents unpa ralleled analogu e and digital pr ...
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Nilfisk-ALTO BK 2.0 - page 4
3 TABLE OF CONTENTS 1. INTRODUCTION........................................................................................................................................4 2.1 Some technical stuff 2. THE CONCEPT BEHIND..........................................................................................................................4 2.2 V o ...
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Nilfisk-ALTO BK 2.0 - page 5
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 2.0 a very v ersatile processor: smart and fast recognition of the program, adjustable Expander/Gate and very low distortion V oltage Control ...
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Nilfisk-ALTO BK 2.0 - page 6
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. 1 and you will see the dif ference if dynamic capacity of various devices when compare ...
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Nilfisk-ALTO BK 2.0 - page 7
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. Now , if you scream into a microphone you will not he ar the n ...
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Nilfisk-ALTO BK 2.0 - page 8
7 2.Close LED This LED illuminates when expansion occurs. 4 5 6 8 7 9 3 ...
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Nilfisk-ALTO BK 2.0 - page 9
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. 3.4 The Back Panel Pic.5: The Back Panel Layout Of The BK 2.0 13 12 15 14 16 OUTPUT INPUT T ...
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Nilfisk-ALTO BK 2.0 - page 10
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 . We also explained to you how the ratio curve of ...
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Nilfisk-ALTO BK 2.0 - page 11
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. If yo u have a ratio eq ual to 1:1 y ou will get the same l ...
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Nilfisk-ALTO BK 2.0 - page 12
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. 5.2 Audio connection The BK 2.0 Compressor/Limiter/Gat e is equipped with balance ...
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Nilfisk-ALTO BK 2.0 - page 13
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. In Line Connection Please see followi ...
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Nilfisk-ALTO BK 2.0 - page 14
13 1/4" TRS insert Tip Ring Sleeve Tip (S ...
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Nilfisk-ALTO BK 2.0 - page 15
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 0.05% t ...
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Nilfisk-ALTO BK 2.0 - page 16
15 7. BLOCK DIAGRAM Chart.8: Block diagram of the BK 2.0 ...
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Nilfisk-ALTO BK 2.0 - page 17
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. 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 e ...
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Nilfisk-ALTO BK 2.0 - page 18
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. Any photocopy , translation, or reproduction of part of this manu ...
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