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LA Audio Electronic BCL20 Operation Manual

Manual is about: Dual/Stereo Broadcast Compressor/Limiter

Summary of BCL20

  • Page 1

    Dual/stereo broadcast compressor/limiter operation manual august 2004.

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    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 fr...

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    2 1.0 introduction 1.0 introduction the bcl20 is a stereo compressor-limiter with a de-essing capability which allows the end user to process two different signals or one stereo program. Applications include : applications include : fm transmitter protection, disc mastering, spl limiting in pa and d...

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    3 2.0 installation 2.0 installation important: please read this section before using the bcl20 important: please read this section before using the bcl20 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 han...

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    4 faults and as such will not normally need replacing. If you think you have a power related problem please refer to your dealer. The voltage and fuse rating have been factory set for - 230v 100mauk 220v 100marepublic of korea 115v 200manorth america •• the correct voltage and fuse rating is indicat...

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    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 joi...

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    6 4 4 description of controls description of controls gain reduction display gain reduction display this 12 led bargraph indicates the amount of compression (in db). The law is expanded at low values. Level display level display this 12 led bargraph indicates either the input level or the output lev...

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    7 threshold threshold this adjust the signal level above which compression occurs. The lower it is set, the greater is the compression. The threshold range is from -40 dbu to +20 dbu. Attack attack this determines how fast the compressor will act upon the incoming signal. This time may be varied fro...

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    8 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 th...

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    9 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 ;...

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    10 be necessary to either reduce the times used or reduce the ratio depending upon the effect required. Modulation modulation if more than about 6db of compression is used, it is desirable to treat individual sound sources or groups of similar sound sources separately in order to avoid modulation ef...

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    11 as an alternative, one can emulate such a filter, using a stereo one-octave equalizer set in such a way that the frequency response approximates that of figure 2. Fig. 2 the bcl20 as an acoustic nuisance the bcl20 as an acoustic nuisance limiter : limiter : this is a complementary aspect of loudn...

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    12 when this is done, one has to copy the frquency response to a graphic equaliser which is inserted in the side-chain. The bcl20 as an automatic voice-over (ducker) : the bcl20 as an automatic voice-over (ducker) : this application is useful in discotheques and radio where it provides an "automatic...

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    13 the following two applications show the bcl20 inserted into an individual channel. After processing, the signal is mixed with the other channels. This is done because the bcl20 is used to modify a sound, not to control its amplitude. Bass drum bass drum vocal vocal the next two applications show ...

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    14 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 output load ...

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    15 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 shipping weight shipping weight 4.8kg, 10.6lbs temperatur...