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Summary of Contents for LA Audio Electronic BCL20
- Page 1 Dual/Stereo Broadcast Compressor/Limiter Operation Manual August 2004...
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Page 2: Table Of Contents
CONTENTS CONTENTS 1. 1. Introduction Introduction Page 2 2. 2. Installation Installation Page 3 3. 3. Warranty Warranty Page 5 4. 4. Description of controls Description of controls Page 6 5. 5. Applications Applications Page 8 6. 6. Specifications Specifications Page 14 7. -
Page 3: Introduction
Main parameters, including threshold, gain, attack and release Main parameters times and compression ratio are user controllable. A unique feature of the BCL20 is the continuously variable detection characteristics. A potentiometer allows mixing of RMS and Peak detectors to tailor the timing parameters to the program being processed. -
Page 4: Installation
2.1 INSPECTION AND UNPACKING 2.1 INSPECTION AND UNPACKING The BCL20 has been carefully packed at our factory in a carton designed to withstand handling in transit. Should the unit appear to have been damaged in transit notify your dealer immediately and do not discard any of the packing. - Page 5 An incorrect fuse could cause damage to the unit and may constitute a fire hazard. If you carry your BCL20 from one country to another it is very important to ensure the voltage is compatible. For your information the unit can be internally rewired for use in 230V, or 110-125V countries - contact your dealer for information.
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Page 6: Warranty
BCL20 rear view showing Channel 2 and Mains connections The input and outputs of the BCL20 are on XLR connectors. For balanced input and outputs, connections to the unit should be wired as follows: +4dBu Pin 1 Screen (Signal ground) -
Page 7: Description Of Controls
DS IN / OUT DS IN / OUT This button instantly adds de-essing capability to the BCL20 by adding a filter into the side-chain. This makes the compressor "frequency conscious", which means that it compresses more on the frequency chosen, in this case the frequency where sibilance occurs. - Page 8 The unique continuously-variable detection characteristic of the BCL20 makes experimentation as easy as turning a knob. NB : The Attack and Release controls relate to the Peak rectifier only. Hence, when the Rectifier control is in the full ccw position (RMS), these controls are inoperative.
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Page 9: Applications
POWER POWER (On rear panel) This switches the unit ON or OFF and the adjacent led lights when the unit is ON 5 APPLICATIONS 5 APPLICATIONS DEFINITIONS OF TERMS USED DEFINITIONS OF TERMS USED Compressor : Compressor : A variable gain amplifier whose gain decreases as the input increases beyond a threshold point. - Page 10 compressor ONLY acts upon those frequencies and passes all other ones. GENERAL GENERAL The usual purpose of Limiting and Compression is to increase loudness and to provide overload protection and generally to control level. Limiting Limiting Limiting is used mainly to provide overload protection ; i.e. to limit the output to some desired output level.
- Page 11 Separate compression will increase the overall compression effect. THE BCL20 AS A LOUDNESS LIMITER THE BCL20 AS A LOUDNESS LIMITER The perceived loudness (SPL) is not linear as a function of frequency.
- Page 12 2. Fig. 2 THE BCL20 AS AN ACOUSTIC NUISANCE THE BCL20 AS AN ACOUSTIC NUISANCE LIMITER : LIMITER : This is a complementary aspect of loudness limiting, but in this instance, the sound pressure level which must be limited is one that remains after attenuation and conduction outside the room or building where the sound is produced.
- Page 13 To do this, the music channels must be routed to separate groups which will be processed through the BCL20 and then reinjected to the Mix busses (sub-group). The voice channels must be routed directly to Mix and to an auxiliary output whichs feeds the Side-Chain insert Return.
- Page 14 Vocal Vocal The next two applications show the BCL20 connected at the output of the mixer. This is because if the BCL20 was inserted in the Mix inserts the level would vary with the setting Of the Master fader. Cassette Mastering...
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Page 15: Specifications
6 SPECIFICATIONS 6 SPECIFICATIONS Frequency Response Frequency Response 20 Hz to 20 kHz +/- 0.5dB Signal to Noise Ratio Signal to Noise Ratio + 4 dBu Input, + 4 dBu Output -94 dB Input Impedance Input Impedance 20k Ohms balanced Output Source Impedance Output Source Impedance 20 Ohms... - Page 16 DS Action DS Action 12 dB at 8 kHz Input Connector Input Connector XLR 3 pin balanced Output Connector Output Connector XLR 3 Pin balanced Dimensions Dimensions 483mm W x 190mm D x 44.5mm H 19"W x 7.5"D x 1.75"H Weight Weight 3.9kg, 8.6lbs...