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Bel BCR-A1 OB
Audio confidence monitor
User’s Guide
Version 1.3
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: +44 (0)1908 641063
Email: [email protected]
Web: www.beldigital.com
© 2017 BEL Digital Audio Ltd.
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BEL DIGITAL AUDIO
Contents
BCR-A1 OB
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
© 2017 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
© 2017 BEL Digital Audio Ltd.
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BEL DIGITAL AUDIO BCR-A1 OB
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.
© 2017 BEL Digital Audio Ltd.
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BEL DIGITAL AUDIO BCR-A1 OB
Fig 1.1 BCR-A1 OB Front panel
© 2017 BEL Digital Audio Ltd.
Fig 1.2 BCR-A1 OB Rear panel
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BEL DIGITAL AUDIO BCR-A1 OB
© 2017 BEL Digital Audio Ltd.
Fig 1.3 BCR-A1 OB link settings
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BEL DIGITAL AUDIO BCR-A1 OB
BCR-A1 OB Specification
Audio Specification
Analogue inputs
Aux inputs
Analogue outputs
Peak acoustic output
Hum & noise main output
Hum & noise line output
Level meters
Speakers
25kΩ impedance differential on XLR connector
25kΩ impedance on phono connectors
50Ω impedance differential on XLR connector
100dB SPL (@ 2ft) more than 80dB below full output.
100dB below full output
2x10 element LED PPI bar graphs
2 mid/treble and two bass
General
Power requirements
Power consumption
Dimensions
Weight
90-260 VAC 40/60Hz
30W Max
483mm x 200mm x 44.3mm
4kg
© 2017 BEL Digital Audio Ltd.
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BEL DIGITAL AUDIO BCR-A1 OB
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.
© 2017 BEL Digital Audio Ltd.
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