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Related Manuals for LA Audio BCL2
Summary of Contents for LA Audio BCL2
- Page 1 SERIES BCL2 OPERATION MANUAL...
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Page 2: Table Of Contents
CONTENTS 1. Introduction 2. Specifications 3. Installation 4. Description of the controls 5. Applications 6. Technical description 7. Maintenance Appendices: Circuit Diagrams PCB Diagrams Outiline and dimensional drawings BCL2... -
Page 3: Introduction
A rear panel jack allows insertion of an external equalizer to achieve more specific frequency-conscious processing. RFI protection has been a main concern in the design of the BCL2 allowing its use in broadcast installations. A ground lift switch allows the elimination of hum loops. -
Page 4: Specifications
Typ. 120 ms for 12 dB Typ. 240 ms for 24 dB Mains power Consumption 6 Volts-amps (115/220 VAC, 50-60 Hz) Meter Calibration 0 Vu = + 4 dBu Maximum Gain Reduction more than 50 dB DS Action ** 12 dB at 8 kHz BCL2... - Page 5 * SMPTE Method : 60 Hz + 7 kHz mixed 4:1, + 20 dBu output. ** DS action Is defined as the Increase of compression at the specified frequency, referenced to compression at 1 kHz. Product Information and specifications are subject to change without notice. BCL2...
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Page 6: Installation
IT IS IMPORTANT TO READ THIS SECTION BEFORE USING THE UNIT. INSPECTION & UNPACKING The Model BCL2 is carefully packed at the factory and the container designed to withstand handling in transit. However, if transit damage Is evident, DO NOT discard any of the packaging material and notify the carrier immediately, as it is he who is responsible for such claims. -
Page 7: Description Of The Controls
This switches the second bargraph display between input and output level. DS/FLAT: This button instantly adds de-essing capability to the BCL2 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 (see applications). As always this is very much open to experimentation. The unique continuously-variable detection characteristic of the BCL2 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
In most cases, a fast release time will be employed so that the transients are controlled quickly without any apparent change in programme content. BCL2... - Page 10 It Is particularly difficult to limit low frequency sounds in a final balance, because the effect on the remaining signal and ambience will be most noticeable. Separate compression will increase the overall compression effect. BCL2...
- Page 11 APPLICATIONS 5.3. APPLICATION OF BCL2 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 discotheques, clubs and concert halls.
- Page 12 APPLICATIONS 5.4. APPLICATION OF BCL2 AS AN ACOUSTIC NUISANCE 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. Very often, only certain low frequencies are transmitted, In particular those which excite resonant modes of cavities, walls or structures.
- Page 13 To do this, the music channels must be routed to separate groups which will be processed through the BCL2 and then reinjected to the Mix busses (subgroup). The voice channels must be routed directly to Mix and to an auxiliary output whichs feeds the Side-Chain insert Return.
- Page 14 In those applications, the BCL2 is inserted in an individual channel. After processing, the signal Is mixed with the other channels. This is done that way because the BCL2 is used to modify a sound, not to control its amplitude.
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Page 15: Technical Description
U3a is used as a positive absolute rectifier. The voltage at TP1 cannot be less than the input voltage of U3, but it can be higher, which can happen if SW203 is closed and the other channel delivers a higher voltage. BCL2... - Page 16 Diodes D201 and D202 in conjunction with capacitor C210 provide an unregulated positive supply of approx. 22V. The turn-on delay is introduced by R203 and C211. DISPLAY PSU: Rectified voltage at C205 is regulated at 15V by 3 pin regulator U203 with local decouple by capacitor C213. BCL2...
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Page 17: Maintenance
MAINTENANCE 7.1. GENERAL The Model BCL2 is a ruggedly constructed solid state unit which requires NO PREVENTIVE OR ROUTINE MAINTENANCE. It is constructed from the highest quality components, which are selected so as to be conservatively rated for maximum Iife. Each unit Is soak-tested before despatch to reduce the possiblity of component failure In the field. - Page 18 - Check the output signal goes to -7dBu {± 1 dB). - Rotate the Rectifier potentiometer and check that the output level does not change more than 1 dB - Check that only 5 LED's stay lit on the Gain Reduction bargraph. BCL2...
- Page 19 - Check that both Gain Reduction bargraphs display the same value. - Disconnect channel 1 and Reconnect Channel 2. - Check same. K) NOISE - Turn off the oscillator. - Check that the output noise is lower than -96 dBu (20 Hz - 20 kHz, RMS rectifier). BCL2...
- Page 20 - Inject a signal at « OdBu on the tip of the jack. - Check that the led's go on again. N) BY-PASS RELAY CHECK - Disconnect the mains plug. - Check the signal continuity between input and output. BCL2...
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