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LA Audio Electronic BCL20, Operation Manual

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LA Audio Electronic BCL20 Operation Manual Download Page 2

1

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.

7.

Front panel blanks

Front panel blanks

Page 16

Summary of Contents for BCL20

Page 1: ...Dual Stereo Broadcast Compressor Limiter Operation Manual August 2004 ...

Page 2: ... 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 7 Front panel blanks Front panel blanks Page 16 ...

Page 3: ...ristics A potentiometer allows mixing of RMS and Peak detectors to tailor the timing parameters to the program being processed The BCL20 takes advantage of a unique transformer distortion cancelling circuit reducing it an order of magnitude compared to conventional designs 2 bargraphs display the amount of compression and the input output level The de essing functions involves a slew rate sensitiv...

Page 4: ...ld the unit be installed in an equipment rack ensure that the ambient temperature conforms to these levels 2 3 CE STANDARDS AND THE LOW VOLTAGE DIRECTIVE LVD 2 3 CE STANDARDS AND THE LOW VOLTAGE DIRECTIVE LVD The BCL20 has been designed to meet the latest Electromagnetic Compatibility EMC regulations However we recommend you do not operate the unit close to strong emitters of electromagnetic radia...

Page 5: ...nging at any time please ensure the correct fuse is fitted 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 A special 100V versi...

Page 6: ...ng failure of the unit within one year of the date of original purchase we will agree to repair or at our discretion replace any defective item without charge for labour or parts To receive service under this warranty it is necessary to return the unit to an LA Audio authorised service centre or to the factory with a dated receipt as proof of purchase After repair the unit will be returned to you ...

Page 7: ...utton 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 RATIO RATIO This determines the ratio of compression applied This may be varied from 1 1 to LIMIT 20 1 The ratio of compression may be defined as the ...

Page 8: ...low frequency signal being longer than the release time The low frequency waveform will be distorted by the initial release of gain reduction because the action is almost certain to occur mid waveform RECTIFIER RECTIFIER This controls the respective percentage of RMS detection and Peak detection that will be processed by the side chain In the extreme positions it uses only one of the rectifiers In...

Page 9: ...lied as the signal rises or starts to be removed as the signal falls The Gain Reduction display will indicate when compression commences and then the threshold can be varied to obtain the desired effect Reducing the threshold point will give more compression effect than leaving it just below the input level Peak detection Peak detection It is closely related to the maximum electric amplitude of th...

Page 10: ...nge of a recording or transmission system Compression Compression Compression describes conditions of gain reduction that are more or less continuous so that the original dynamics are compressed A low compression ratio is used when it is desirable to preserve a relationship with the original dynamics but higher ratios provide useful effects particularly in pop recording and the transmission of spe...

Page 11: ...sion 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 The human ear is more sensitive to the mid frequencies than to very low or very high frequencies This phenomenon must be taken into account when using a limiter to control the maximum loudness in certain areas such as ...

Page 12: ... the sound is produced Very often only certain low frequencies are transmitted in particular those which excite resonant modes of cavities walls or structures To achieve efficient limiting of those frequencies it is necessary to measure the noise transmission using a real time spectrum analyser preferrably 1 3ÿoctave When this is done one has to copy the frequency response to a graphic equalizer w...

Page 13: ...ucing the background music accordingly 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 The BCL20 must be in the Stereo mode The active front panel controls are those of the ch...

Page 14: ...se the BCL20 is used to modify a sound not to control its amplitude Bass Drum Bass Drum 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 Cassette Mastering FM Transmission FM Transmission ...

Page 15: ...utput 1 kHz 10 dB compression 0 07 1 kHz by pass 0 01 Intermodulation Distortion Intermodulation Distortion 0 01 Compression Ratio Compression Ratio Continously variable from 2 1 to 20 1 Attack Time Peak Attack Time Peak Continously variable from 0 1 to 70 millisec Release Time Peak Release Time Peak Continously variable from 100 millisec to 3 sec Attack Time RMS Attack Time RMS Program dependant ...

Page 16: ... W x 190mm D x 44 5mm H 19 W x 7 5 D x 1 75 H Weight Weight 3 9kg 8 6lbs Shipping Weight Shipping Weight 4 8kg 10 6lbs Temperature Range Temperature Range Operating Operating 0C to 50C Storage Storage 30C to 75198 C Note In these specifications 0 dBu is referenced to 0 775 V RMS LA Audio reserves the right to alter any feature or specification without prior notice E OE ...

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