PA BM-A250 User manual

USER GUIDE
H10795/H10797 - Version 1 / 03-2018
Loop amplifiers for areas from 250 to 1000m²

BM-A250-1000 - Loop amplifiers for areas from 250 to 1000m²
Page 2
1 - Please read carefully :
We strongly recommend to read carefully and understand the safety instructions before
attempting to operate this unit.
2 - Please keep this manual :
We strongly recommend to keep this manual with the unit for future reference.
3 - Operate carefully this product :
We strongly recommend to take into consideration every safety instruction.
4 - Follow the instructions:
Please carefully follow each safety instruction to avoid any physical harm or property
damage.
5 - Avoid water and wet locations :
Do not use this product in rain, or near washbasins or other wet locations.
6 - Installation :
We strongly encourage you to only use a fixation system or support recommended
by the manufacturer or supplied with this product. Carefully follow the installation
instructions and use the adequate tools.
Always ensure this unit is firmly fixed to avoid vibration and slipping while operating
as it may result in physical injury.
7 - Ceiling or wall installation :
Please contact your local dealer before attempting any ceiling or wall installation.
8 - Ventilation :
The cooling vents ensure a safe use of this product, and avoid any overheating risk.
Do not obstruct or cover these vents as it may result in overheating and potential
physical injury or product damage. This product should never been operated in a
closed non-ventilated area such as a flight case or a rack, unless cooling vents are
provided for the purpose .
9 - Heat exposure :
Sustained contact or proximity with warm surfaces may cause overheating and product
damages. Please keep this product away from any heat source such as a heaters,
amplifiers, hot plates, etc...
Sound levels
Our audio solutions deliver important sound pressure levels
(SPL) that can be harmful to human health when exposed
during long periods. Please do not stay in close proximity of
operating speakers.
1 - Safety information
Important safety information
Symbols used
Any maintenance procedure must be performed by a CONTEST
authorised technical service. Basic cleaning operations must tho-
roughly follow our safety instructions.
This product contains non-isolated electrical components. Do not
undertake any maintenance operation when it is switched on as
it may result in electric shock.
This unit is intended for indoor use only. Do not use it in a wet,
or extremely cold/hot locations. Failure to follow these safety ins-
tructions could result in fire, electric shock, injury, or damage to
this product or other property.
WARNING : This unit contains no user-serviceable parts. Do not open the housing or attempt
any maintenance by yourself. In the unlikely even your unit may require service, please contact your
nearest dealer.
In order to avoid any electrical malfunction, please do not use any multi-socket, power cord extension
or connecting system without making sure they are perfectly isolated and present no defect.
10 - Electric power supply :
This product can only be operated according to a very specific voltage. These
information are specified on the label located at the rear of the product.
11 - Power cords protection:
Power-supply cords should be routed so that they are not likely to be walked on or
pinched by items placed upon or against them, paying particular attention to cords at
lugs, convenience receptacles and the point where they exit from the fixture.
12 - Cleaning precautions :
Unplug the product before attempting any cleaning operation. This product should be
cleaned only with accessories recommended by the manufacturer. Use a damp cloth
to clean the surface. Do not wash this product.
13 - Long periods of non use :
Disconnect the unit’s main power during long periods of non use.
14 - Liquids or objects penetration :
Do not let any object penetrate this product as it may result in electric shock or fire.
Never spill any liquid on this product as it may infiltrate the electronic components
and result in electric shock or fire.
15 - This product should be serviced when :
Please contact the qualified service personnel if :
- The power cord or the plug has been damaged.
- Objects have fallen or liquid has been spilled into the appliance.
- The appliance has been exposed to rain or water.
- The product does not appear to operate normally.
- The product has been damaged.
16 - Inspection/maintenance :
Please do not attempt any inspection or maintenance by yourself. Refer all servicing
to qualified personnel.
17 - Operating environment :
Ambient temperature and humidity: +5 - +35°C, relative humidity must be less than
85% (when cooling vents are not obstructed).
Do not operate this product in a non-ventilated, very humid or warm place.
Recycling your device
• As HITMUSIC is really involved in the environmental cause,
we only commercialise clean, ROHS compliant products.
• When this product reaches its end of life, take it to
a collection point designated by local authorities. The
separate collection and recycling of your product at the time
of disposal will help conserve natural resources and ensure
that it is recycled in a manner that protects human health
and the environment.
This symbol signals an important safety precaution.
The CAUTION symbol signals a risk of product deterioration.
The WARNING symbol signals a risk to the user’s physical integrity.
The product may also be damaged.
Instructions and recommendations

AUDIOPHONY PUBLIC ADDRESS
Page 3
2 - Packaging content
3 - Front face and settings
A
D E F G
B C
x1 Cordon d’Alimentation x2 Connecteurs 3 points
x1 Noticex2 Connecteurs 2 points
x2 Autocollants
« Espace adapté aux malentendants »
x1 Connecteur 2 points
Amplificateur BM-A450/BM-A1000
3 4 5 6 7 8 9
10
13 14 18 19 20
15 17 21 22 23 24
16
11 12
2
1
1. ON/OFF switch
2. "POWER" LED, ON/OFF display
3. "CLIP" LED, Affichage niveau d'entrée trop élevé
4. LED "LOOP", Display input level too high
5. "PROTECT" LED, fault overview display
6. Output current view meter
7. Output current setting
8. Input signal view meter
9. Input 1 setting (Line or mic)
10. Input 2 setting (Line or mic)
11. Input 3 setting (Line or mic) (100V)
12. MLC setting (Metal Loss Compensation) reduces interference problems with metal
structures

BM-A250-1000 - Loop amplifiers for areas from 250 to 1000m²
Page 4
Master amplifier
90° output to slave
amplifier
Master input
Slave amplifier
4 - Connections
5 - Connecting two amplifiers
3 4 5 6 7 8 9
10
13 14 18 19 20
15 17 21 22 23 24
16
11 12
2
1
13. Combo 1 input : Line or mic
14. Phantom power switch
15. Line or microphone selector for input 3
16. Line or microphone selector for input 2
17. Input 2 terminal block Phoenix type : Mic or line
18. Master amplifier input (BM-A1000 only)
19. Output to Slave amplifier in phase (BM-A1000 only)
20. Output to Slave amplifier 90° out of phase (BM-A1000 only)
21. Input 2 terminal block Phoenix type : 100V priority
22. NO/NF fault synthesis relay
23. oop input on terminal block Phoenix type
24. Connecting power cord
For the use of a pin system or a system with a large cover:
1. Connect the loops to the terminal blocks provided for this purpose: Loop terminal block
of the amplifier.
2. Insert an audio source into input 2 or 3 of the master amplifier.
3. Connect the master amplifier to the slave amplifier using the connection cable.

AUDIOPHONY PUBLIC ADDRESS
Page 5
W
W
H H H
G
G
6-1 Example of a perimeter layout
6-2 Example of the implementation of a hairpin system
Master input
W = 1.6m
G = 0.8m
H = 0.4m
0.4 m from wall0.4 m from wall
6 - Installation
The installation consists of an electrical
wire that runs through the perimeter of
the room forming a loop.
This loop is connected to an audio
amplier.
The magnetic eld generated by the
large loop around the room will pass
through the small loops in the prosthesis
and, by the induction principle, the
electrical signal present in the large loop
will be found in the small loops.
This transmits the signal from the
audio amplier to the prosthesis, which
then returns it to the hearing impaired
person's ear.
Twisted cable for the connection
between the amplier and the
loop (max 15m)

BM-A250-1000 - Loop amplifiers for areas from 250 to 1000m²
Page 6
6-3 Example of the implementation of a large roofing system
6-4 Cable cross-section table
Maximum lenght (m) / Cable section (mm²)
1 1.5 2.5 4 Copper
ribbon
BM-A250 70 80 90 100 90
BM-A1000 90 105 140 160 140

AUDIOPHONY PUBLIC ADDRESS
Page 7
6-5 Operation
The loop wire is connected to an audio amplier. The hearing aid has a coil, often called a"T"
or"T-coil", which is placed inside the hearing aid and consists of a wire forming turns. The
magnetic eld generated by the large loop will pass through the small loops in the prosthesis
and, by the induction principle, the electrical signal present in the large loop will be found in
the small loops. This transmits the signal from the audio amplier to the prosthesis, which then
returns it to the hearing impaired person's ear.
The loop can be installed at oor or ceiling level, more precisely between 1.10m and 2.20m
from the listening height (ears).
The presence of an earring is often indicated by a blue logo representing a crossed out ear and
a letter T. Generally, a hearing aid has two major positions, the M and the T. The M position
makes it possible to perceive the sound thanks to the acoustic pressure as a microphone, while
the T position (T for telephone) directly receives the audio signals transmitted by induction
via the integrated coil. Some prostheses combine these two modes of operation by the MT
position. It allows the hearing impaired to perceive both ambient noise and signals transmitted
by induction.
Loop amplifier
Magnetic
loop
Microphone
Equalizer
Hearing aid
Coil
M/T selector

BM-A250-1000 - Loop amplifiers for areas from 250 to 1000m²
Page 8
7 - Technical specifications
BM-A250 BM-A1000
Inputs
Audio inputs 3 inputs : x2 Line/ x1 microphone - 100V
Type Phoenix and or Neutrik Combo
Power supply 12V 2mA
Sensitivity -50dB micro, +40dB 100V, -10dB ligne
Slave input -6.35mm Jack plug
Priorité Entrée 100V
Power supply
Type Integrated
Voltage 230V (120V optional) 50/60 Hz
Power 300VA
Poxer consumption 6W
Audio Specifications
Metalic loss 0 à 3 dB / octave
Automatic gain control AGC speech optimised
Dynamic > 36 dB
Bandwidth 80Hz à 9.5kHz
Output
Output voltage 35V rms (50V pK)
Loop impedance 0.5Ωto 3Ω
Peak current 8A 15A
RMS current 5A RMS 10A RMS
Couverture maximale 250 m² (10 x 25 m) 1000 m² (20 x 50 m)
Additional functions
Default « protect » LED display
Checking
(Synthesis failure) DC current too high - Open loop – Thermal protect
Relay NO / NC relay failure
Size (mm) and weight
L x H x D 483 x 44 x 215 mm
Weight 2,47 Kg

Because AUDIOPHONY®takes the utmost care in its products to make sure you only get the best possible quality, our products are
subjects to modifications without prior notice. That is why technical specifications and the products physical configuration might differ
from the illustrations.
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