Full Text Searchable PDF User Manual
MA 240 100V 40W Mixer Amplifier
Order code: CRAM04
FOR YOUR OWN SAFETY, PLEASE READ THIS USER MANUAL CAREFULLY
BEFORE YOUR INITIAL START-UP!
Keep this equipment away from rain,
moisture and liquids.
Every person involved with the installation, operation & maintenance of this
Follow the instructions of this manual
CAUTION! TAKE CARE USING THIS EQUIPMENT!
HIGH VOLTAGE-RISK OF ELECTRIC SHOCK!!
Before your initial start-up, please make sure that there is no damage caused during
transportation. Should there be any, consult your dealer and do not use the equipment.
To maintain the equipment in good working condition and to ensure safe operation, it is
necessary for the user to follow the safety instructions and warning notes written in this
Please note that damages caused by user modifications to this equipment are not
subject to warranty.
The manufacturer will not accept liability for any resulting damages caused
by the non-observance of this manual or any unauthorised modification to the
• Never let the power-cable come into contact with other cables. Handle the
power-cable and all mains voltage connections with particular caution!
• Never remove warning or informative labels from the equipment.
• Do not open the equipment and do not modify the equipment.
• Do not switch the equipment on and off in short intervals, as this will reduce the
• Only use the equipment indoors.
• Do not expose to flammable sources, liquids or gases.
• Do not carry the unit with only one handle. Always carry using both handles.
• Always disconnect the power from the mains when equipment is not in use or
before cleaning! Only handle the power-cable by the plug. Never pull out the plug
by pulling the power-cable.
• Make sure that the mains supply voltage is 240V.
• Make sure that the power-cable is never crimped or damaged. Check the
equipment and the power-cable periodically.
• If the equipment is dropped or damaged, disconnect the mains power supply
Have a qualified engineer inspect the equipment before operating again.
• If the equipment has been exposed to drastic temperature fluctuation (e.g. after
transportation), do not switch it on immediately. The arising condensation might
damage the equipment. Leave the equipment switched off until it has reached
• If your product fails to function correctly, discontinue use immediately. Pack the
unit securely (preferably in the original packing material), and return it to your
Prolight dealer for service.
• Only use fuses of same type and rating.
• Repairs, servicing and power connection must only be carried out by a qualified
technician. THIS UNIT CONTAINS NO USER SERVICEABLE PARTS.
• WARRANTY; One year from date of purchase.
• If this equipment is operated in any other way, than those described in this
manual, the product may suffer damage and the warranty becomes void.
• Incorrect operation may lead to danger e.g.: short-circuit, burns, electric shocks,
lamp failure etc.
• Do not endanger your own safety and the safety of others!
Incorrect installation or use can cause serious damage to people and property.
This 100V line mixer amplifier was designed specifically for use in permanent audio
installations, where reliability and premium sound quality are a must. Highly rugged
construction and high efficiency design make this amplifier perfect for continuous duty
applications in situations were power will be left on for indefinite periods of time.
This 100V line amplifier is warranted from defects for one year from the date of purchase.
Should your amplifier require service, either within or beyond that warranty period, please
contact your Prolight Dealer.
This unit includes a host of features, along with an impressive list of specifications, which
are detailed over the next pages. Please take the time to read this document completely
prior to installation of this product.
The Mixer Amplifier series is equiped with priority function. They are designed to suit all PA
system application in schools, offices and stores.
• 70V, 100V and low impedance 4-16Ω loudspeaker output
• Two microphone, one AUX and one telephone input
• MIC 1 via XLR input with +48V phantom power, VOX priority and VOX level control
• MIC 2 via 6.35mm jack
• MIC 1-2, AUX 1-2 and master volume controls and bass/treble tone control
• Telephone input with automatic priority function over all inputs
• Short circuit, overload and high temperature protection
• LED VU meter with protect indication
• 24V DC power input
70V, 100V & 4-16
Input sensitivity/impedance for MIC 1-2
(MIC in @ 1kHz preamp out):
Input sensitivity/impedance for AUX
(AUX in @ 1kHz, preamp out):
Input sensitivity/impedance for TEL
(TEL in @ 1kHz, preamp out):
Dimensions (H x W x D):
66 x 320 x 273mm
1. POWER SWITCH
2. POWER -
Adjust bass response. Rotate clockwise to increase bass output and anticlockwise to
4. TREBLE -
Adjust treble response. Rotate clockwise to increase treble output and
anticlockwise to reduce it.
5. AUX -
Aux volume control
6. TEL -
Telephone volume control
7. MIC1 \ MIC2 -
MIC volume control (MIC1/MIC2)
8. MASTER -
Adjust volume output. Rotate clockwise to increase volume output and
anticlockwise to reduce it.
9. MIC -
MIC1 input 6.35mm Microphone jack input
10. LEVEL INDICATORS -
Level meters 6 output level indicators, reduce the master volume if
the RED Peak LED illuminates
11. PROT -
Protection indicator LED
12. MIC1 ADJ -
Adjusts the mute volume from 0-20dB when MIC1 overrides all other input
13. MIC1 XLR/6.35mm -
XLR/6.35mm Jack combi socket
14. MIC2 -
MIC 2 input 6.35mm Microphone jack input
15. AUX -
Line input suitable for CD players, tuners or MP3 players
16. LINE OUT -
Connect to line level sources such as CD/MP3 players
17. TEL INPUT -
Balanced input suitable for connection to the output of a telephone
based paging system
18. SPEAKER TERMINALS -
Connectors for 4-16 ohms or 70V and 100V speakers
19. POWER INPUT -
220-240V 50/60Hz, Fuse: F1A-250V
20. 48V PHANTOM -
48V Phantom power switch apply power to XLR input, suitable for powering
Short cables runs improve the sound quality remarkably. Input cables should be short and direct,
since high frequencies will mostly be absorbed if the cables are unnecessarily long. Besides that
a longer cable may lead to humming and noise problems. If the cable runs are unavoidable, you
should use balanced cables.
The high damping factor of your amplifier supplies a clear sound reproduction. Unnecessarily long
and thin cables used for low impedance (4-16Ω) speakers will influence the damping factor and
thus the low frequencies in a negative way. In order to safeguard good sound quality, the damping
factor should lie around 50. The longer a cable has to be the thicker it should be. For longer cable
runs please ensure the 100V outputs are used for 100V speakers.
Connect your speaker systems via the speaker terminals (COM = -VE)
Examples: 1) COM + 4-16Ω
2) COM + 70V
3) COM + 100V
Connections To The Mains
Before connecting the amplifier to the local mains voltage outlet should be checked to ensure the
available supply is 240V~AC 50Hz. This product is CLASS1 and requires a protective mains earth
to be connected at all times. DO NOT remove or disconnect the earth.
Power On/Off Procedure
After connecting your amplifier to the mains, turn all controls counter clockwise to the “min” posi-
tion. Turn on audio sources (MP3 players, CD players, Microphones etc) before powering the
amplifier ON. The last product to be switched on is the amplifier.
If you wish to power off the system, turn the amplifier’s master volume control counter clockwise
to the “min” position before switching the amplifier OFF before any audio sources are switched off.
By following this procedure it will prevent acoustic shocks to the speakers or potential damage to
1. After connecting all audio sources and powering on the mixer amplifier, adjust the level of each
audio input to achieve the desired “mix”. Care should be taken to when adjusting microphone
input volumes and the master volume, adjust both of these in small increment’s to avoid feedback
(howl around). The goal is to achieve a clear balance between music and voice ensuring an-
nouncements can be clearly heard.
2. The Telephone and Microphone input No.1 feature adjustable voice operated override (VOX),
this will mute all other inputs. After 3 seconds of no signal to the TEL or MIC1 inputs the other
inputs will return to their original state. The VOX mute time can be adjusted on the rear panel. The
TEL input has highest priority, followed by the MIC1.
3. The Clever Acoustics amplifiers all feature output VU meter’s with PEAK indication. Should the
PEAK indicator illuminate (flashing) the output of the amplifier is too high, turn the master volume
anti-clockwise to reduce the output.
4. The Clever Acoustics amplifiers all feature protection with LED indication. Should the PRO-
TECT indicator illuminate, turn the master volume control anti-clockwise fully and switch off the
amplifier for 15 seconds as the amplifier may have entered PROTECT mode temporarily due to a
peak signal, care should then be taken to ensure all input levels are set correctly. If the amplifier
persists to enter PROTECT mode the amplifier should be switched off and left to cool for 5-10
minutes before switching back on. If the PROTECT indicator remains lit this indicates a problem
with the amplifier or amplifier load (ie Short Circuit).
5. Speaker & Amplifier systems can produce high sound pressure levels, please operate all
controls with caution to ensure people are not exposed to excessive or dangerous sound pressure
• Both the 4 - 16Ω and 100V terminals cannot be used at the same time.
• Impedances indicated in the figures represent the total speaker system (load) impedances.
Loads presented to the amplifier must be equal to or greater than listed above. Speaker
impedances must be measured using a true impedance meter, do not standard multimeters.
Be sure to attach the supplied terminal cover attached after
connection. Because high voltage is applied to the speaker
terminals, care should be taken never touch these terminals to
avoid electric shock.
All speaker connections should be made using bare wire or suitable
insulated crimp terminals. Please ensure no loose strands are present
as these may short across terminals causing damage to the amplifier
Connection With The Mains
Connect the unit to the mains via the IEC mains inlet using the 13A UK - IEC cord supplied.
The earth has to be connected.
Switch the unit on. After switching on the speaker system, wait 8 - 10 seconds before you turn the
volume control up in order to avoid speaker damage.
Increase the level of each channel up to the point where the clip LEDs illuminate.
Always check the sound pressure level with a meter in order to keep to the legal threshold.
Balanced XLR Jack Connection
We recommend a frequent cleaning of the product. Please use a soft lint free and moistened
cloth. Never use alcohol or solvents.
There are no serviceable parts inside the product except for the fuse. Maintenance and service
operations are only to be carried out by authorised dealers.
Replacing the fuse
Only replace the fuse by a fuse of the same type and rating.
Before replacing the fuse, unplug the mains lead.
Should you need any spare parts, please use genuine parts.
Should you have any further questions, please contact your dealer.
CAUTION - DANGER TO LIFE
DISCONNECT FROM THE MAINS BEFORE
STARTING MAINTENANCE OPERATION
The power cord is not connected
The power cord of the respective
product is not connected properly or
not at all.
The connection socket or the plug
The input signal is too strong
Load impedance is to low
Check the power cord and any
Check the power cord and if the
plugs are properly connected with
Clean the socket and/or the plug.
Reduce the input signal via the
Check load impedance vs amplifier
specification, reduce as required.