AMC MA 240 User manual

User
Manual
MA 240
Mixing amplier

Safety instructions
USER MANUAL MA 240 Mixing amplier
When using this electronic device, basic precautions
should always be taken, including the following:
1Read all instructions before using the product.
2Do not use this product near water (e.g., near a bathtub, washbowl,
kitchen sink, in a wet basement or near a swimming pool etc).
3 Use this device when you are sure that amplifier has
a stable base and it is fixed securely.
4This product, in combination with loudspeakers may be
capable of producing sound levels that could cause permanent hearing
loss. Do not operate for a long period of time at a high volume level or at
a level that is uncomfortable. If you experience any hearing loss or ringing
in the ears, you should consult with otorhinolaryngologists.
5The product should be located away from heat sources such as radiators,
heat vents, or other devices that produce heat.
6The product should be connected to a power supply that is described
in the operating instructions or are marked on the product.
7The power supply should be undamaged and never share an outlet
or extension cord with other devices. Never leave device plugged
into the outlet when it is not being used for a long period of time.
8Care should be taken that objects do not fall into liquids and liquids
would not be spilled on the device.
9The product should be serviced by qualified service personnel if:
– The power supply or the plug has been damaged.
– Objects have fallen into or liquid has been spilled on the product.
– The product has been exposed to rain.
– The product has been dropped or the enclosure damaged.
10 There are some areas with high voltage inside, to reduce the risk of electric
shock do not remove cover of the microphone receiver or power supply.
The cover should be removed by the qualified personnel only.
CAUTION
To reduce the risk of electric shock, do not remove screws.
No user-serviceable parts inside. Refer servicing to qualied
service personnel. To reduce the risk of re, electric shock
or product damage, do not expose this apparatus to rain,
moisture, dripping or splashing and that no objects lled
with liquids, such as vases, shall be placed on the apparatus.
RISK OF ELECTRIC SHOCK
DO NOT OPEN

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Minimum Usage 18mm
Minimum Usage 18mm
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age 18mm
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25
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18
18m
8m
8m
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Table of contents
USER MANUAL MA 240 Mixing amplier
Before you start
Introduction......................................................................................................................................................2
Features................................................................................................................................................................2
Operation
Front panel ........................................................................................................................................................3
Rear panel...........................................................................................................................................................4
Front panel operation................................................................................................................................5
Rear panel operation.............................................................................................................................6-7
Output terminal........................................................................................................................................8-9
Controls and connectors
Connectors.....................................................................................................................................................10
Cable wiring examples...................................................................................................................10-11
Specifications
General specifications.............................................................................................................................12

USER MANUAL MA 240 Mixing amplier
Before you start
02
MA mixing amplifiers for rack mount or stand alone. It is a widely used mixing amplifier designed for
different applications for public address and paging systems, useful for background music systems.
Universal structure of the units, audio signal mixing possibilities, various inputs and outputs have wide
application in simple installations. No need of professional installation assistance. Shop, bar or restaurant
personnel can manage the installation of these mixing amplifiers by itself. Can be used as a component
of voice evacuation or public address system. Line, microphone inputs, phantom power supply, different
connectors, preamp out and direct power amplifier stage input connectors expands the fields of
application of these high quality mixing amplifiers.
FEATURES


USER MANUAL MA 240 Mixing amplier
||3. Tone control |4. Master volume |5. Output level indicator ||
Operation
03

USER MANUAL MA 240 Mixing amplier04
Operation
|||4. Output terminal | 6. Input to power amplifier stage | | | | 10. Music on hold level control
11. Connector for MOH equipment | | 13. Gain and phantom power selector | | 

USER MANUAL MA 240 Mixing amplier
Front panel operation
XLR INPUTS LEVEL CONTROL
inputs can be used as balanced line level as well as microphone level inputs.
The phantom power can be activated for these inputs separately in rear panel.
The input gain selector is located in the rear panel too.
AUX INPUTS LEVEL CONTROL
TONE CONTROL
The separate tone controls provide attenuation of bass and treble response.
The flat position is obtained when the knobs are set to middle position. Turn
clockwise to raise tone level by approximately +10 dB; turn counterclockwise to
lower tone level by approximately -10 dB.
05
Operation
MASTER VOLUME
This potentiometer is designed to adjust audio level in the main output.
OUTPUT LEVEL INDICATION
continuously the output is distorted. In this case, decrease the sound volume by
master volume control.
POWER INDICATOR
powered.
POWER SWITCH
up if the amplifier is
powered.

USER MANUAL MA 240 Mixing amplier06
Operation
Rear panel operation
VENTILATION HOLES
To ensure proper amplifiers cooling leave these ventilation’s holes unblocked.
Blocked ventilation’s holes can be reason of amplifiers damage.
POWER CONNECTOR AND AC FUSE
+24V DC TERMINAL
OUTPUT TERMINAL
Output terminal is designed to connect audio line to amplifier. There are availa-
PREAMPLIFIER OUTPUT
and amplifier input are designed to insert signal processor such as equalizer or
limiter.
INPUT TO POWER AMPLIFIER STAGE
and amplifier input are designed to insert signal processor such as equalizer or
limiter.
REC OUTPUT
This is line level stereo RCA output to connect audio recording equipment.
AUX INPUT
BALANCED XLR INPUTS
-


USER MANUAL MA 240 Mixing amplier
Operation
Rear panel operation
MUSIC ON HOLD LEVEL CONTROL
This rotary knob allows adjusting volume level in the MOH output.
CONNECTOR FOR MOH EQUIPMENT
1W 8Ω and 0dB 600Ω outputs are designed for music on hold.
TEL INPUT
-
GAIN AND PHANTOM POWER SELECTOR
TEL INPUT GAIN CONTROL
PRIORITY
Input 1 can be set as priority input. To set priority, please turn priority potenti-
ometer to the right until the end. To deactivate priority turn to the left until the
end.
07

USER MANUAL MA 240 Mixing amplier08
Operation
Output terminal
DC24V
4 ohm
Connecting the speakers to 4 ohm output
+ - COM 4Ω 25V 70V 100V
DC24V
8 ohm 8 ohm
Total impedance 4 ohm
+ - COM 4Ω 25V 70V 100V
DC24V
4 ohm 4 ohm
Total impedance 8 ohm
+ - COM 4Ω 25V 70V 100V
DC24V
4 ohm
Connecting the speakers to 4 ohm output
+ - COM 4Ω 25V 70V 100V
DC24V
Connecting the speakers to 70V output
+ - COM 4Ω 25V 70V 100V
0 70V 0 0
70V 70V
DC24V
16 ohm 16 ohm
Total impedance 8 ohm
+ - COM 4Ω 25V 70V 100V

USER MANUAL MA 240 Mixing amplier
09
Operation
Output terminal
configuration at the same time. Operating amplifiers using 4 ohm and 70 or 100
volt concurrently may cause damage to the amplifier or connected speakers.
There is possibility to connect external power supply, external battery etc.
DC24V
Connecting the speakers to 100V output
+ - COM 4Ω 25V 70V 100V
0 100V 0 0
100V 100V
DC24V
24V
+ - COM 4Ω 25V 70V 100V

USER MANUAL MA 240 Mixing amplier
Controls and connections
Connectors
TS connector
TRS connector
Cable wiring examples
Cable to balanced input from balanced output. TRS connectors.
Cable to unbalanced input from balanced output. TRS and TS connectors.
Cable to balanced input from unbalanced output. TS and TRS connectors.
Cable to unbalanced input from unbalanced output. TS connectors.
RCA connector
10

USER MANUAL MA 240 Mixing amplier
Controls and connections
RCA cable. Cable to unbalanced input from RCA output. RCA and TS connectors.
Cable to balanced input from RCA output. RCA and TRS connectors.
Cable to RCA input from balanced output. RCA and TRS connectors.
11

USER MANUAL MA 240 Mixing amplier
General Specifications
12
The specifications are correct at the time of printing this manual.
For improvement purposes, all specifications for this unit, including
design and appearance, are subject to change without prior notice.
Fuses Output power 240 W
AC power consumption 600 W
Total harmonic distortions < 1 %
Input 1
Input sensitivity
Line -8 dBu
MIC -50 dBu
Frequency response 80 Hz – 16 kHz 3dB at 100Hz
Indicators Output Dimensions 88mm(H) x 420mm(W) x 330mm(D)
Weight 12.8kg