LA Audio Electronic BCL20 Скачать руководство пользователя страница 6

5

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:

XLR

+4dBu Pin 1

Screen (Signal ground)

Pin 2

Hot (+ve)

Pin 3

Cold (-ve)

For unbalanced operation join pins 1 and 3 on either input or
output.

The 'Side chain' connectors are on ¼ inch TRS jacks and are
wired as follows

TRS jack

Tip

Send

Ring

Return

Sleeve Screen (signal ground)

3  WARRANTY

3  WARRANTY

Your LA Audio BCL20 has been manufactured to a high
standard using quality components. If correctly installed and
operated the unit should give years of problem free operation.

However in the event of a defect in material or workmanship
causing 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 free of charge.

Limitations:

Limitations:

This warranty does not cover damage resulting from accident or
misuse. The warranty is void unless repairs are carried out by
an authorised service centre. The warranty is void if the unit has
been modified other than at the manufacturers instruction. The
warranty does not cover components which have a limited life,
and which are expected to be periodically replaced for optimal
performance. We do not warrant that the unit shall operate in
any way other than as described in this manual.

Содержание BCL20

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

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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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