Bel Digital Audio BMA2-4SHD Manual de usuario

BM#A2#4SHD*MKII*

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BM-A2-4SHD MKII

4 Channel Digital Audio Monitor

User’s Guide

Version 1.0 01/04/2015

BM#A2#4SHD*MKII*

!2015

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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.

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

MK1 1RD

United Kingdom

Tel: +44 (0)1908 641063

Email: info@beldigital.com

Web: www.beldigital.com

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Contents!

Introduction!............................................................................................................................................!4!

Main!features!..........................................................................................................................................!5!

Front!panel!rotary!controls!.....................................................................................................................!6!

Operation!................................................................................................................................................!7!

Selecting!sources!.................................................................................................................................!7!

SDI!input!mode!...................................................................................................................................!7!

Directing!sources!to!speakers!.............................................................................................................!7!

Status!display!..........................................................................................................................................!7!

Rear!panel!inputs!....................................................................................................................................!8!

Rear!panel!outputs!..................................................................................................................................!8!

Menu!.......................................................................................................................................................!9!

Top!level!menu!page!...........................................................................................................................!9!

Line!level!output!adjustment!............................................................................................................!11!

Installation!............................................................................................................................................!12!

Specifications!........................................................................................................................................!13!

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Introduction!

The BM-A2-4SHD MKII is a 2U high-quality four-channel audio monitor with multiple I/O as

standard. Designed in a compact 200 mm depth chassis, making it also ideal for outside

broadcast applications, the unit accepts audio from any one of two AES input pairs, four

analogue inputs or one of two SDI inputs and produces two pairs of AES outputs and one pair

of analogue monitor outputs. The SDI inputs automatically detect SD or HD or 3G video and

de-multiplex one SDI audio group. An active loop-through output is available for the SDI input

selected.

The headphone output mutes the speakers when used. Four high-resolution tri-colour

bargraphs are provided with user-selectable ballistics and colour break points. Up to four

channels can be selected individually or mixed and directed to each speaker.

Bargraph meters are arranged in pairs, either side of the status display. Stick-on graticule

scales, which may be applied to the spaces between the front-panel bargraphs, are supplied

with the machine.

The four audio channels selected are also provided at the rear of the unit as two pairs of AES

signals. The analogue outputs can be at a fixed level or slaved to the front panel volume

control (the pfixed output level can be selected from the menu). The analogue outputs can

also be muted independently from the menu or under the control of the front panel mute

switch.

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Main!features!!

 Compact 200 mm depth chassis, making it also ideal of OB/flyaway applications

 Two pairs of unbalanced (BNC) digital audio inputs (AES3id)

 Two auto-sensing SD/HD/3G inputs with regenerated loop-through

 Two balanced analogue inputs (XLR)

 Two pairs of tri-colour bargraphs

 Analogue monitor line outputs (XLR) and two AES3id outputs (BNC)

 Headphone connector with speaker mute

 Stainless steel chassis

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Front!panel!rotary!controls!

Volume

The volume of the speaker and headphone output can be adjusted using this control.

Volume level is indicated on the Status Display. Pressing the end of the control will mute

the speaker audio. This can also mute the analogue outputs.

Balance

This control will differentially adjust the level of the speaker and headphone output.

Pressing the end of this control will centre the audio output.

Pressing the end of this control will enter the menu mode described in the Menu section.

Input select

Rotating this control will select one of the four audio input sources; Analogue, AES, SDI1

or SDI2.

Group select

Rotating this control will select one of the four audio groups embedded in the SDI

stream. The group selected will be de-embedded and made available for monitoring. The

four de-embedded audio channels will also be available on the AES3id outputs.

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Operation!!

Selecting!sources!!

The input source select switch determines which source (Analogue, AES, SDI 1 or SDI 2)

is available to the speaker selectors and bargraphs. AES inputs can be from 44.1 kHz to

96 kHz sampling rate.

SDI!input!mode!!

The unit automatically detects SD, HD or 3G video. The SDI group (1 to 4) to be monitored

is selected by the Group switch on the front panel.

Directing!sources!to!speakers!!!

Where more than two audio signals are present it may be useful to direct and combine

sources to selected speakers. The left speaker is indicated by a red LED and the right by a

green LED on the top of the bargraphs.

To direct a particular source to the left or right speakers proceed as follows:

Repeatedly press the button under the bargraph corresponding to the input audio signal

required until the top LEDs of the bargraph shows red for the left speaker, green for the

right or both to direct the audio to both speakers. Each speaker can receive a mix of audio

from inputs 1 to 4.

Note that the mix button assignments are retained over power-down.

Status!display!!

The Status display will show general status information related to the currently selected

input such as the source selected and video standard where applicable. It also displays on

the bottom row the volume level as a horizontal bar.

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Rear!panel!inputs!

The BM-A2-4SHD MKII accepts SDI video, AES and analogue audio inputs. Four balanced

analogue inputs are provided on XLR connectors. Two AES3id unbalanced inputs are also

available on BNC connectors. Two SD, HD, 3G auto-select SDI inputs are provided on

BNC connectors.

Rear!panel!outputs!!

The BM-A2-4SHD MKII provides both digital and analogue audio outputs on the rear panel.

The audio carried on the AES outputs are derived from the currently selected input source

(analogue, AES or SDI). In effect, these audio outputs are a copy of the signals shown on

the unit’s bargraphs (channels 1-4). Two balanced analogue monitor outputs are provided

which carry the same audio as the speakers. The levels of the analogue outputs can be

configured to either be fixed or adjustable via the front panel volume control in the menu. It

is possible to mute the output from the unit’s speakers by pressing the end of the VOLUME

control. It is also possible to independently mute the analogue outputs, either via the volume

control or by muting it using the menu.

An SDI loop-through is available which carries a reconstituted SDI signal from the currently

selected SDI input.

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Menu!

Many of the characteristics of the BM-A2-4SHD MKII can be adjusted in the menu. When

the menu is activated, by pressing the NAV rotary encoder, the top level of the menu will

appear. The items in this level can be selected by rotating the encoder and then pressing

it for approximately 0.5 seconds. The second level will then appear and the required item

selected by rotating the encoder and then pressing it. At this point in the menu the value

of the current parameter can be adjusted. To go back one step in the menu press and

hold the encoder for longer than 1 second.

Tip: Simultaneously pressing the buttons under the bargraphs 3 and 4 will completely exit

the menu.

The characteristics that can be adjusted in the menu are shown below.

Top!level!menu!page!

The top level of the menu carries the main areas of operation of the BM-A2-4SHD MKII

that can be adjusted.

1. Level meters - This section allows access to the bargraph colour break points and

ballistics.

2. Line levels - The analogue output level control can be selected here (either fixed level or

controlled by the volume control). The analogue output can also be muted, or slaved to

the main speaker mute control.

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Level!Meter!Adjustment*

Various aspects of the audio level indication can be adjusted here.

1. Amber threshold - The point at which the bargraph changes from green to amber can be

adjusted here. Bargraph 4 is forced to full scale to allow easy control of the colour

transitions.

2. Red threshold - The point at which the bargraph changes from amber to red can be

adjusted here. Bargraph 4 is forced to full scale to allow easy control of the colour

transitions.

3. Ballistics - The scales and dynamics of the bargraphs can be selected here. The options

are AES, DIN, VU and BBC. The appropriate scales should be affixed to the front panel.

4. Analogue offset - When an analogue input is selected and the bargraph ballistics are

AES the way in which this is displayed is adjusted here. If 0 dB analogue is applied to the

unit the bargraph can be configured to show either -18 dB or -20 dB.

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