Related Manuals for Alto BK 2.0
Summary of Contents for Alto BK 2.0
- Page 1 User's Manual BK 2.0 COMPRESSOR /LIMITER /GATE www.altoproaudio.com Version 2.0 Dec. 2002 English English...
- Page 2 SAFETY RELATED SYMBOLS CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN The symbol is used to indicate that some hazard- ous live terminals are involved within this apparatus, even under the normal operating conditions. The symbol is used in the service documentation to indicate that a specific component shall be only replaced by the component specified in that docu- mentation for safety reasons.
- Page 3 LTO BK 2.0 is the result of many hours of listening and tests involving common people, area experts, musicians and technicians.
-
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 Dynamic Enhancer Section 3.4 The Rear Panel 4. READY TO ROLL?...9 4.1 Expander/Gate Section 4.2 Compressor Section 4.3 Limiter Section... -
Page 5: Introduction
The AUTO Function Your BK 2.0 includes and AUTO function switch on the front panel. Thanks to the AUTO function attack and release times of the program materials are automatically analysed. Then the dynamic range of the program is heavily compressed in a very musical way so that there will not be any audible breathing or pumping effect. - Page 6 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 look at Chart. 1 and you will see the difference if dynamic capacity of various devices when compare to the human ear.
- Page 7 2.1.4 More about noise: Expanders and Noise-Gates A lot 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 hear the noise generated by such microphone because such noise will be "masked"...
- Page 8 2.Close LED This LED illuminates when expansion occurs.
- Page 9 To change, pull fuse-holder out and rotat OUTPUT INPUT CHANNEL 2 Pic.5: The Back Panel Layout Of The BK 2.0 OUTPUT INPUT INPUT RING = OUTPUT...
-
Page 10: Expander/Gate Section
It simply cut-off the entire signal below a certain set threshold. The BK 2.0 is equipped with a new kind of expander, the SRC (Smart Ratio Control). The ratio of the SRC is automatically adjusted according to the audio signal level. - Page 11 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 BK 2.0 the attack time can be set in a range of 1 to 200 milliseconds.
-
Page 12: Limiter Section
4.2.8 Gain Reduction Meter This consists of 8 LED on the front of the BK 2.0. 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 Limiter Section... - Page 13 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 1/4"TRS jack Unbalanced input For XLR connector XLR Unbalanced input b. In Line Connection Please see following drawing for details.
- Page 14 1/4" TRS insert Tip (S Ring Sleeve...
-
Page 15: Technical Specifications
6. TECHNICAL SPECIFICATIONS Type Impedance AUDIO INPUT Maximum input level Type Impedance Maximum output level Frequency response AUDIO OUTPUT THD +N% @ 1kHz, +4dBu IMD (SMPTE) @+10dBu Noise & Hum unity gain Noise & Hum, fully off Cross talk @ 20kHz CMR @ 1kHz Type Threshold... -
Page 16: Block Diagram
7. BLOCK DIAGRAM Chart.8: Block diagram of the BK 2.0... -
Page 17: Warranty
8. 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 18 SEKAKU ELECTRON IND. 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.