BEL BCR 4 User manual

Bel BCR 4
Audio confidence monitor
User’s Guide Version 1.2

BEL DIGITAL AUDIO BCR 4
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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.!
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All!trademarks!acknowledged.!
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The!information!in!this!document!is!subject!to!change!without!notice.!
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Bel (Digital Audio) Ltd.
Unit 3
Horwood Court
Bletchley
Milton Keynes
Bucks
MK11RD
United Kingdom
Tel: [phone]
Email: [e-mail]
Web: www.beldigital.com

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Contents'
INTRODUCTION....................................................................................................................... 4!
Front panel controls.................................................................................................................................4!
Rear panel.................................................................................................................................................4!
Mains input ............................................................................................................................................4!
Audio inputs...........................................................................................................................................4!
FIG 1.1 BCR 4 FRONT PANEL ................................................................................................ 5!
FIG 1.2 BCR 4 REAR PANEL ..................................................................................................5!
BCR 4 SPECIFICATION ...........................................................................................................6!
Audio Specification ..................................................................................................................................6!
General......................................................................................................................................................6!
EMC COMPLIANCE ................................................................................................................. 7!

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Introduction
The BCR 4 is a 4 stereo pair professional audio confidence monitor housed in
a 1U rack. The unit features four amplifiers and four speakers The BCR 4 will accept
four pairs of stereo analogue inputs then produce 4 mono audio signals. These are
output to the internal speakers.
Front panel controls
4 volume controls are located on the front panel, one for each stereo pair. A power on
indicator is also provided. Fig 1.1.
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
Eight female XLR type connectors are provided to receive the analogue audio inputs.
These inputs are treated as stereo pairs and four mono signals are derived from them. Fig1.2.

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Fig 1.1 BCR 4 Front panel
Fig 1.2 BCR 4 Rear panel

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BCR 4 Specification
Audio Specification
Analogue inputs 25kΩdifferential on female XLR connector
Peak acoustic output 85dB SPL per speaker (@ 2ft)
Hum & noise main output more than 80dB below full output.
Speakers -10 db @ 220 Hz
General
Power requirements 90-260 VAC 40/60Hz
Power consumption 30W Max
Dimensions 483mm x 200mm x 44.3mm
Weight 4kg

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EMC compliance
The BCR4 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.