BEL BMA1-2SHD User manual
BMA1-2SHD
HD/SD audio monitor
User’s Guide Version 1.0 20/07/06
BEL DIGITAL AUDIO BMA1-2SHD
2006 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: 01908-641063
Email: info@beldigital.com
Web: www.beldigital.com
BEL DIGITAL AUDIO BMA1-2SHD
2006 BEL Digital Audio Ltd. 3
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Contents................................................................................................................... 3
Introduction............................................................................................................. 4
Main features......................................................................................................... 4
Operation................................................................................................................. 5
Selecting sources................................................................................................... 5
Installation............................................................................................................... 7
Adjusting audio monitor output level..................................................................... 8
Inserting bargraph graticules.................................................................................12
BMA1-2SHD Front panel ......................................................................................13
BMA1-2SHD Rear panel........................................................................................13
Specification............................................................................................................14
BEL DIGITAL AUDIO BMA1-2SHD
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The BMA1-2SHD is a professional audio monitor system housed in a
1U rack.
The unit features three internal speakers, left, right and bass.
Audio input signals can be in the form of HD or SD SDI embedded
data.
The BMA1-2SDH can select any pair of audio channels from the 16
possible and direct these to the speakers. The same signal is available
as a line-level audio monitor output.
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• 2 x HD/SD auto detect SDI inputs
• 2 x loop through outputs
• High-quality, high SPL audio reproduction with bass speaker and soft
limiting
• 2 x tri-color bargraphs with six standard scales and ballistics,
adjustable colour transition points and peak-hold facility
• Line level analogue audio output of sources directed to loudspeakers
• Headphone connector with speaker mute
• Individually user-calibrated analogue audio level outputs
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The front panel user interface consists of 2 rotary switches, a balance
control, a volume control, two 26-element tri colour bar graphs and a
headphone jack. Two LED indicators are also included to show SDI
lock and amplifier soft limit.
The rear panel 2 SDI BNC inputs, 2 SDI BNC loop through outputs and
a pair of analogue line outputs on XLR sockets. An IEC mains inlet/fuse
and off/on switch module is also on the rear panel
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Two SDI SD/HD auto-detecting inputs are available. The required input
can be selected by using the input switch on the front panel.
One pair of audio signals from the 16 possible channels embedded in the SDI
video information can be selected by using the 8 way channel switch on the
front panel.
BEL DIGITAL AUDIO BMA1-2SHD
2006 BEL Digital Audio Ltd. 6
Bargraph scales
The following bargraph ballistics may be selected using internal switches.
BMA1-2SHD scale ballistics
Stick-on scale graticules, which may be applied to the space between the front-panel
bargraphs, are supplied with the unit.
note: Bargraph color transition points and peak hold decay may also be adjusted internally.
Refer to the Configuration chapter for switch settings and graticule fitting instructions.
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The BMA1-2SHD 1U frame may be installed in 19 inch bays with
327mm depth including typical cable and connector depth. The
dimensions of the BMA1-2SHD are 483x283x44.3. Its weight is 5kg
and the max power dissipated is 60 W.
Ventilation is by natural convection and there are vents at each side
and on the top and bottom covers of the unit. Frames may be installed
into bays, providing airflow through these vents is not impeded.
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In the following tables, ON is obtained with a switch lever in the DOWN
position. The adjustments are located on the main board.
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The bargraph displays have 25 LEDs. The level segments may be
assigned to three colored zones, red, amber and green. Up to 25 of the
top most segments may be colored red. Up to 25 segments from the
end of the red zone downward may be colored amber and the
remaining segments (if any) are always green.
Choosing how many segments are colored red from the top of the
bargraph sets the .red zone.. Select from none to 25 using SW2-2,
SW2-1, SW6-8, SW6-7 and SW6-6 as follows:
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2006 BEL Digital Audio Ltd. 11
Choosing how many segments are colored amber from the end of .red
zone. sets the .amber zone.. Select from none to 25 using SW6-5,
SW6-4, SW6-3, SW6-2 and SW6-1 as follows:
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BEL DIGITAL AUDIO BMA1-2SHD
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SDI I/O
Inputs 2 BNC SD/HD auto detect
Loop through outputs 2 BNC.
Video modes:
SD
625 PAL
525 NTSC
HD 1035i(30 &30/1..1)
1080i/1080sF (30 &30/1.001)
1080i/1080sF(25)
1080sF(24 & 24/1.001)
1080p(25)
1080p(24 &24/1.001)
720p(60 & 60/1.001)
720p (30 & 30/1.001)
720p (50)
720p (25)
720p (24 &24/1.001)
Analog monitor outputs
Max output level Noise +THD -105dB
Frequency response
Analogue outputs 20 Hz to 20kHz ±1dB
Main drive amps Noise +THD -80dB w.r.t. maximum output
Speaker driver units
Total peak acoustic level (@2ft) 100dB SPL
Shielding Magnetic
Meters
Level meters 2 x hi-resolution tri-color bargraphs
(All audio measurements made using Audio Precision un-wtd 22Hz to 22kHz
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2006 BEL Digital Audio Ltd. 15
Scales and Ballistics
NORDIC: Overall dynamic range: 54dB (+12 to -42dB)
Attack time: 5mSec
Fallback: 1.7Sec per 20dB decay
DIN PPM: Overall dynamic range: 55dB (+5 to -50dB)
Attack time: 10mSec
Fallback: 1.5Sec per 20dB decay
BBC PPM: Overall dynamic range: (+12 to-12dB from mark 7 to mark 1)
Attack time: 10mSec
Fallback: 2.85Sec (from mark 7 to mark 1)
VU: Overall dynamic range: 23dB (+3 to -20dB)
Attack time: 300mSec
Fallback: 300mSec
VU EXT: Overall dynamic range: 80dB (+20 to -60dB)
Attack time: 300mSec
Fallback: 300mSec
AES/EBU: Overall dynamic range: 60dB (0 to -60dB)
Attack time: 1mSec
Fallback: 1.5Sec per 20dB decay
Housing 19. Rack Mount: 1U high.
Outline Dimensions: 483mm(W) x 283mm(D) x 44.3mm(H)
19inch(W) x 11.1inch(D) x 1.75inch(H)
Power 60W (max) 90-264 VAC 50-60Hz
Autoselect, Fuse 2A HAC
Environmental Temperature 0°C to 30°C Humidity 70% max (non-
condensing)
Weight 11.6lbs (5kg)
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EMC COMPLIANCE
The BMA1-2SHD was designed and tested to comply with the EMC directive
numbers EN55103, EN55022, EN55082-1 and EN60950 when used as
directed.
Please ensure that wherever possible a 1U space is provided above and
below the Bel BMA1-2SHD to ensure that the unit is properly ventilated,
unless forced air-cooling is employed in the rack.
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