NASAB BMA 30 User manual

BMA SERIES: INSTALLATION & OPERATION MANUAL
PAGE 2
The inDESIGN BMA 30, BMA 60, BMA 120 and BMA 240
are high quality mixer ampliers for commercial and industrial
audio applications.
The BMA series feature 4 Mic/line inputs. Microphone input 1
features a mute so that a Microphone on this channel will mute
all other inputs, useful for paging announcements. The BMA
Series provide either 4 Ohm or constant voltage 100V speaker
outputs. A pre-amp out/power amp in link allows for the mixer
audio signal to be sent to an external equaliser or a booster
amplier. Shipped with a link tted.
The mixer ampliers are part of inDESIGN’s Install Series, which
also includes mixers and power ampliers. These units provide
excellent features and value.
INTRODUCTION
INTRODUCTION 2
IMPORTANT SAFETY
INSTRUCTIONS 3
INSTALLATION 5
FRONT PANEL 6
REAR PANEL 7
BLOCK DIAGRAM:
• Input 8
• Mix 9
• BMA 30/60 10
• BMA 120/240 11
SPECIFICATIONS 12
CONTENTS
Electrical and Safety Warnings
THESE SERVICE INSTRUCTIONS ARE FOR USE BY QUALIFIED SERVICE PERSONNEL ONLY.
TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT PERFORM ANY SERVICING
OTHER THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS
UNLESS YOU ARE QUALIFIED TO DO SO.
CAUTION
The lightening ash with arrowhead
symbol, with an equilateral triangle,
is intended to alert the user to the
presence of un-insulated
“dangerous voltage” within the products
enclosure that may be of sufcient
magnitude to constitute a risk of electric
shock to persons.
WARNING: TO REDUCE THE RISK OF ELECTRIC
SHOCK, DO NOT REMOVE COVER (OR BACK).
NO USER SERVICEABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED SERVICE PERSONNEL.
AVERTISSEMENT: POUR ÈVITER
LE RISQUE D´INCENDIE OU DE CHOCS
ÈLECTRIQUES, NE PAS EXPOSER CET APPAREIL À
LA PLUIE OU À L´HUMIDITÈ
The exclamation point within an
equilateral triangle is intended to
alert the user to the presence of
important operating and maintenance
(servicing) instructions in the literature
accompanying the appliance.

BMA SERIES: INSTALLATION & OPERATION MANUAL PAGE 3
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. To prevent injury please refer to these instructions for electrical and safety information before installing or
operating the apparatus.
6. This apparatus must not be exposed to dripping or splashing liquid.
No object lled with liquid, such as a vase, should be placed on the apparatus.
7. Clean only with a dry cloth.
8. Do not block any of the ventilation openings. Install in accordance with the manufacturer’s instructions.
9. Do not install near any heat sources such as radiators, heaters, stoves, or other apparatuses
(including ampliers) that produce heat.
10. Unplug this apparatus during lightening storms or when not in use for long periods of time.
11. Protective Earthing Terminal:
The apparatus should be connected to a mains socket outlet with a protective earthing connection.
12. The mains plug/appliance coupler is used as a disconnect device, the disconnect device shall remain
readily operable.
13. When not in use and during transportation, please take care of the power cord set, for example, tie up
the power cord set with a cable tie/something similar. It should be kept away from sharp edges and
the like that can cause abrasion of the power cord set. When put into use again, check that the power
cord set is not damaged. If any damage is found, have the unit checked by a qualied service person
to replace the power cord set specied by the manufacturer.
14. The terminals marked with symbol of “ “ may be of sufcient magnitude to constitute a risk of
electric shock. The external wiring connected to the terminals requires installation by a qualied service
person or the use of ready-made leads or cords.
15. Only use attachments/accessories specied by the manufacturer.
16. Check speaker line load prior to connecting to amplier using an impedance meter.
17. Refer all servicing to qualied service personnel. Servicing is required if the apparatus has been
damaged in any way, such as power-supply cord or plug breakage, damage due to liquid or objects
falling onto the apparatus, exposure to rain or moisture, or if the apparatus does not operate normally,
or has been dropped.
18. Correct Disposal of this Product:
This marking indicates that this product should not be disposed with other household wastes throughout
the EU. To prevent possible harm to the environment or human health from uncontrolled waste disposal,
recycle it responsibly to promote the sustainable reuse of material resources. To return your used device,
please use the return and collection systems or contact the retailer where the product was purchased.
They can take this product for environmental-safe recycling.
WARNING: There are no user serviceable parts inside. Refer all servicing to qualied service personnel.

BMA SERIES: INSTALLATION & OPERATION MANUAL
PAGE 4
>10cm >4in
>10cm >10cm
>4in >4in
>10cm
>4in
You must allow a minimum 10 cm or 4 inches of unobstructed clearance around the unit.
Do not place the unit on a bed, sofa, rug, or similar surface that could block the ventilation openings. If the
unit is placed in a bookcase or cabinet, there must be ventilation of the cabinet to allow proper cooling.

BMA SERIES: INSTALLATION & OPERATION MANUAL PAGE 5
To calculate the ampliers capability:
If your chosen amplier has a maximum output of
120 Watts at 100V, the minimum impedance connected should be at least 83 Ohms (100V x 100V/120W).
Use a professional impedance meter, not a Multimeter.
INSTALLATION
How to Calculate the correct load for a 100V Amplier:
When installing a 100V loudspeaker system it is rather simple to calculate the number of loudspeakers that
can be connected to a particular 100V amplier.
Each 100V loudspeaker has a 100V transformer that will have different power tappings, for example 1.5, 3
and 6W. The sum of all taps should never exceed the ampliers power rating.
BMA 60
AMPLIFIER POWER > LOUDSPEAKER LOAD POWER
39W 1.5 1.5 3 3 6 12 12 = + + + + + +

BMA SERIES: INSTALLATION & OPERATION MANUAL
PAGE 6
FRONT PANEL
1. Power Switch: Turns mains power on and off.
The round LED light surrounding the Master Volume control indicates the unit is on/off.
2. Level Indicator: To set for optimum working level normal signal should be kept under the 0dB.
The red +3dB will illuminate when signal is excessive.
3. Input 1 to Input 4: The selected Microphone or Line input level is controlled via these knobs.
4. Treble: Adjust the level to suit the required tone of the output. Increasing the treble may improve
intelligibility, decreasing the treble may reduce the onset of high frequency feedback.
5. Bass: Adjust the Bass level to suit the required tone of the output. Increasing Bass may make music
sound fuller, reducing the Bass in reverberant spaces may improve speech intelligibility.
6. Master level: Adjust the overall system volume to suit the environment and use of the system.

BMA SERIES: INSTALLATION & OPERATION MANUAL PAGE 7
REAR PANEL
7. Mains Socket: The unit is connected to the mains circuit with a standard IEC type power lead.
This socket contains a rated slow blow fuse.
**NOTE: Only use a fuse equal to the marked rating
• BMA 30 uses a T1.25AH slow blow fuse
• BMA 60 uses a T2AH slow blow fuse
• BMA 120 uses a T5AH slow blow fuse
• BMA 240 uses a T8.0AH slow blow fuse
8. Loudspeaker Outputs:
When connecting low impedance loudspeakers use the COM and 8Ω connections.
For 70V and/or 100V loudspeakers use the COM and 70V or 100V connections.
For 70V or 100V operation, the total minimum impedance of the loudspeaker lines should not overload
the amplier. Refer to the above installation guide for how to calculate the loudspeaker load or
measure with an impedance meter.
Use only one of the loudspeaker connections. Do not combine both 8Ω and 70V/100V loudspeaker
connections.
9. Pre-Out/Main-In: If required the output signal can be sent from the pre-amplier of the mixer to an
external device such as an equaliser or processor and the processed signal can be fed back into the
amplier via the Main-In connection. If this feature is not used ensure the RCA link is connected across
the Pre-Out/Main-In. If this link is lost the unit will not pass audio signals connected to the unit.
10. Input 1 Mic/Line: This microphone input features 48V phantom power for powering Condenser
Microphones. The Vox level pot sets the threshold of the internal Priority Mute level. Microphone 1 input
can mute all other inputs. The input selector switch is used to choose between the Microphone or Line
input. The Microphone input can be connected to either the 3pin XLR or the Phoenix terminal. The line
input can be connected to the Dual RCA inputs or to the Phoenix terminal. The Dual RCA is internally
summed for mono.
11. Inputs 2,3,4 Mic/Line: The input selector switch is used to choose between the Microphone or Line input.
The Microphone input can be connected to either the 3pin XLR or the Phoenix terminal.
The line input can be connected to the Dual RCA inputs or to the Phoenix terminal.
The Dual RCA is internally summed for mono.

BMA SERIES: INSTALLATION & OPERATION MANUAL PAGE 8 BLOCK DIAGRAMS Input:

BMA SERIES: INSTALLATION & OPERATION MANUAL PAGE 9 Mix: BLOCK DIAGRAMS

BMA SERIES: INSTALLATION & OPERATION MANUAL PAGE 10 BMA 30/60: BLOCK DIAGRAMS

BMA SERIES: INSTALLATION & OPERATION MANUAL PAGE 11 BMA 120/240: BLOCK DIAGRAMS

BMA SERIES: INSTALLATION & OPERATION MANUAL
PAGE 12
SPECIFICATIONS
BMA 240 BMA 120 BMA 60 BMA 30
Output power 240W 120W 60W 30W
AC power supply 230VAC -240VAC
Output low impedance 4 ohm-8 ohm 4 ohm-8 ohm 4 ohm-8 ohm 4 ohm-8 ohm
Hi impedance output 70V / 20 ohm 70V / 40 ohm 70V / 80 ohm 70V / 160 ohm
100V / 41 ohm 100V / 80 ohm 100V / 160 ohm 100V / 320 ohm
Input sensitivity Microphone balanced XLR, 1mV
Line RCA 500mV
Frequency response 50Hz-18Khz, + / - 2dB. At -3dB rated power
Noise oor 8mV at 100V output 9mv at 100V output 10mv at 100V output 8mv at 100V output
THD (at -3dB rate power) Less than 0.5% 0.40% 0.22% 0.21%
Tone control Bass 100Hz + - 10dB, Treble 10kHz + - 10dB
Control Input level, tone control, master level, VOX
VOX CH 1 has priority over CH2, 3, 4. (AFL)
Phantom power 48V at CH 1 MIC XLR
Cooling Fan cooling,
Thermal control
Convection Cooling
Protection Thermal protected at 95 degrees, muted input, short circuit, overload
Level meter LED meter, range -24dB / 0dB
Size mm. 485 x 88 x 315 485 x 88 x 275 485 x 88 x 275 488 x 88 x 275
Weight KG (Net) 11 8.7 7.6 6.5