BEL BCR-A1 OB User manual

Bel BCR-A1 OB
Audio confidence monitor
User’s Guide Version 1.2 20/09/11

BEL DIGITAL AUDIO BCR-A1 OB
BEL (Digital Audio) Ltd. has made every effort to ensure the accuracy of information
contained within this document which is nevertheless supplied for information purposes only
and does not constitute any form of warranty or guarantee.
All trademarks acknowledged.
The information in this document is subject to change without notice.
Bel (Digital Audio) Ltd.
Unit 3
Horwood Court
Bletchley
Milton Keynes
Bucks
MK11RD
United Kingdom
Tel: [phone]
Email: [email protected]
Web: www.beldigital.com
2007 BEL Digital Audio Ltd.
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BEL DIGITAL AUDIO BCR-A1 OB
Contents
CONTENTS............................................................................................................................... 3
INTRODUCTION....................................................................................................................... 4
Front panel controls...............................................................................................................................4
Balance/ Left level................................................................................................................................4
Aux inputs ............................................................................................................................................4
Input level indicators............................................................................................................................4
Anti-phase indicator .............................................................................................................................4
Right level ............................................................................................................................................4
Headphone jack....................................................................................................................................4
Power on indicator................................................................................................................................4
Rear panel...............................................................................................................................................5
Mains input...........................................................................................................................................5
Audio inputs.........................................................................................................................................5
Line outputs..........................................................................................................................................5
FIG 1.1 BCR-A1 OB FRONT PANEL....................................................................................... 6
FIG 1.3 BCR-A1 OB LINK SETTINGS..................................................................................... 7
BCR-A1 OB SPECIFICATION.................................................................................................. 8
Audio Specification..............................................................................................................................8
General .................................................................................................................................................8
EMC compliance ....................................................................................................................................9
2007 BEL Digital Audio Ltd.
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BEL DIGITAL AUDIO BCR-A1 OB
Introduction
The BCR-A1 OB is a professional audio confidence monitor housed in a 1U
rack. The unit features four amplifiers, four speakers and an analogue line output. The
BCR-A1 OB will accept one pair of analogue inputs.
Front panel controls
Several controls and connectors are located on the front panel, Fig 1.1, from left to
right these are:
Balance/ Left level
In the stereo mode this control will adjust the balance between the left and right
speakers. In the two-channel mode this control will adjust the left speaker output level. The
mode can be selected by adjusting the links shown in Fig 1.3
Aux inputs
There are two RCA phono input connectors provided on the front panel for
convenient temporary monitoring. These inputs operate in parallel with the rear panel inputs.
Input level indicators
Two LED bar graph PPI displays indicate the current input level. The input level that
shows 0dB on these bar graphs can be internally selected to be +4dB or 0dB. Fig 1.3
Anti-phase indicator
A single LED will illuminate to indicate sustained anti-phase on the inputs.
Right level
This control adjusts the right speaker output level.
Headphone jack
A 6mm headphone jack is provided on the front panel. Inserting a jack plug will mute
the speakers.
Power on indicator
2007 BEL Digital Audio Ltd.
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BEL DIGITAL AUDIO BCR-A1 OB
2007 BEL Digital Audio Ltd.
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Rear panel
Several connectors are provided on the rear panel, from left to right these are:
Mains input
This is a combination IEC connector, fuse and off/on switch.
Audio inputs
Two female XLR type connectors are provided to receive the analogue audio inputs.
These inputs are treated as a stereo pair or two independent channels as selected by the
internal links. Fig 1.3.
Line outputs
Two male XLR type connectors are provided that carry a line level analogue audio
output. The level on these connectors can be adjusted by selecting internal links. Fig 1.3.

BEL DIGITAL AUDIO BCR-A1 OB
Fig 1.1 BCR-A1 OB Front panel
Fig 1.2 BCR-A1 OB Rear panel
2007 BEL Digital Audio Ltd.
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BEL DIGITAL AUDIO BCR-A1 OB
2007 BEL Digital Audio Ltd.
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Fig 1.3 BCR-A1 OB link settings

BEL DIGITAL AUDIO BCR-A1 OB
BCR-A1 OB Specification
Audio Specification
Analogue inputs 25kimpedance differential on XLR connector
Aux inputs 25kimpedance on phono connectors
Analogue outputs 50impedance differential on XLR connector
Peak acoustic output 100dB SPL (@ 2ft)
Hum & noise main output more than 80dB below full output.
Hum & noise line output 100dB below full output
Level meters 2x10 element LED PPI bar graphs
Speakers 2 mid/treble and two bass
General
Power requirements 90-260 VAC 40/60Hz
Power consumption 30W Max
Dimensions 483mm x 200mm x 44.3mm
Weight 4kg
2007 BEL Digital Audio Ltd.
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BEL DIGITAL AUDIO BCR-A1 OB
2007 BEL Digital Audio Ltd.
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EMC compliance
The BCR-A1 OB was designed and tested to comply with the EMC directive
numbers EN55103, EN55022 and EN55082-1 when used as directed.
It is recommended that, where possible, all cables be good quality screened
twisted pairs with the screening braid connected to pin 1 on the XLR
connector. Optimum performance is obtained using double-screened cable
with separate ground returns.