BEL BCR-A8 User manual

Bel BCR-A8
Audio confidence monitor
User’s Guide Version 1.0 30/09/04

BEL DIGITAL AUDIO BCR-A8
2004 BEL Digital Audio Ltd.
2
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
Tel: [phone]
Email: [email protected]
Web: www.beldigital.com

BEL DIGITAL AUDIO BCR-A8
2004 BEL Digital Audio Ltd.
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Contents
CONTENTSINTRODUCTION 3
INTRODUCTION 4
Front panel controls 4
Balance/ Left level 4
Input selector 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-A8 FRONT PANEL 6
FIG 1.3 BCR-A8 LINK SETTINGS 7
Analogue input pin connections 8
BCR-A8 Specification 9
Audio Specification 9
General 9
EMC compliance 10

BEL DIGITAL AUDIO BCR-A8
2004 BEL Digital Audio Ltd.
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Introduction
The BCR-A8 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-
A8 will accept eight pairs of analogue audio 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
Input selector
The audio input pair routed to the amplifiers and speakers can be selected using this
switch.
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 0dB or –10dB. Fig 1.3
Anti-phase indicator
A single LED will illuminate to indicate sustained anti-phase on the selected 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

BEL DIGITAL AUDIO BCR-A8
2004 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 25 way D type connectors are provided to receive the analogue audio inputs.
The first of these receives analogue input pairs 5 to 8 and the second input pairs 1 to 4.
These inputs are treated as stereo pairs 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-A8
2004 BEL Digital Audio Ltd.
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Fig 1.1 BCR-A8 Front panel
Fig 1.2 BCR-A8 Rear panel

BEL DIGITAL AUDIO BCR-A8
2004 BEL Digital Audio Ltd.
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Fig 1.3 BCR-A8 link settings

BEL DIGITAL AUDIO BCR-A8
2004 BEL Digital Audio Ltd.
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Analogue input pin connections
Analogue inputs 1 –4 Analogue inputs 5 -8
Pin Function Pin Function
1
2
Left 1 +
Left 1 –
1
2
Left 5 +
Left 5 –
3Ground
3Ground
4
5
Left 2 +
Left 2 –
4
5
Left 6 +
Left 6 –
6Ground
6Ground
7
8
Left 3 +
Left 3 –
7
8
Left 7 +
Left 7 –
9Ground 9Ground
10
11
Left 4 +
Left 4 –
10
11
Left 8 +
Left 8 –
12
13
14
Ground
Ground
Ground
12
13
14
Ground
Ground
Ground
15
16
Right 1 +
Right 1 –
15
16
Right 5 +
Right 5 –
17 Ground
17 Ground
18
19
Right 2 +
Right 2 –
18
19
Right 6 +
Right 6 –
20 Ground
20 Ground
21
22
Right 3 +
Right 3 –
21
22
Right 7 +
Right 7 –
23 Ground
23 Ground
24
25 Right 4 + Right 4 –
24
25 Right 8 + Right 8 –

BEL DIGITAL AUDIO BCR-A8
2004 BEL Digital Audio Ltd.
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BCR-A8 Specification
Audio Specification
Analogue inputs8 Pairs differential, 25kΩimpedance on
2 x 25 way D connectors
Analogue outputs 50Ωimpedance differential on XLR connector
Hum & noise main output more than 80dB below full output.
Hum & noise line output 100dB below full output
Peak acoustic output 100dB SPL (@ 2ft)
Level meters 2x10 element LED PPI bar graphs
Speakers 2 mid/treble and 2 bass
General
Power requirements 90-260 VAC 40/60Hz
Power consumption 30W Max
Dimensions 483mm x 256mm x 44.3mm
Weight 4kg

BEL DIGITAL AUDIO BCR-A8
2004 BEL Digital Audio Ltd.
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EMC compliance
The BEL 2120 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.