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Clever MA 360 User Manual

MA 3120 MA 3240

Made by: Clever
Type: User Manual
Category: Amplifier
Pages: 14
Size: 0.87 MB


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MA 3240 100V 240W Mixer Amplifier

MA 3120 100V 120W Mixer Amplifier

MA 360 100V 60W Mixer Amplifier

Order code: CRAM09

Order code: CRAM08

Order code: CRAM07



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FOR  YOUR  OWN  SAFETY,  PLEASE  READ  THIS  USER  MANUAL  CAREFULLY                                        



     Keep this equipment away from rain,

 moisture and liquids.


Every person involved with the installation, operation & maintenance of this 

equipment should:


Be competent


Follow the instructions of this manual



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.



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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 


  system’s life.


• 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 available voltage is between 220V-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  


  room temperature.


• 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 




• 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.


• Do not endanger your own safety and the safety of others!


  Incorrect installation or use can cause serious damage to people and property.


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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 PA 

system application in schools, offices and stores.


• 50V, 70V, 100V and low impedance 4-16Ω loudspeaker output

• Four balanced XLR microphone inputs with phantom power, selectable priority, gain and  

  volume control

• 4 stereo RCA line inputs with front panel selector switch

• Built-in chime function with 2/4 tone selector and external trigger contact

• Balanced XLR line output suitable for use with external power amplifiers

• REC output for tape recorder

• PRE-AMP output and PRE-AMP input for extra signal processor

• Master, MIC 1-4, AUX volume

• Bass and treble controls

• Optional DC input for use with battery backup power sources or for operation using high

  capacity batteries

• LED VU meter with peak indication

• Fan cooled



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MA 360

MA 3120

MA 3240

Power output:

60Wrms / 75W peak

120Wrms / 135Wpeak 240Wrms / 255Wpeak

Speaker outputs:

50V, 70V, 100V & 


50V, 70V, 100V & 


50V, 70V, 100V & 


Microphone inputs:

4 x XLR balanced 

with phantom power

4 x XLR balanced 

with phantom power

4 x XLR balanced 

with phantom power


-50 / -2dB, 2.5 / 


-50 / -2dB, 2.5 / 


-50 / -2dB, 2.5 / 


S/N ratio:




Frequency response:

40Hz-17kHz (



40Hz-17kHz (



40Hz-17kHz (



Phantom power:




4 Auxiliary inputs:

Tuner and tape inputs 



200mV / 47k

200mV / 47k

200mV / 47k

CD and line inpute 



500mV / 47k

500mV / 47k

500mV / 47k

S/N ratio:




Frequency response:




















2 tone and 4 tone 


2 tone and 4 tone 


2 tone and 4 tone 



Output level/imped-


775mV / 47k

775mV / 47k

775mV / 47k

Output REC/imped-


200mV / 1k

200mV / 1k

200mV / 1k






Fan cooled

Fan cooled

Fan cooled

Power consumption:




DC power supply:




AC power supply:




Dimensions (H x W 

x D):

88 x 484 x 353mm

88 x 484 x 353mm

88 x 484 x 353mm





Order code:





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1. MIC 1/2/3/4 Volume Control:  

    Level (volume) control of each individual microphone input.

2. Aux Volume Control:

    Level (volume) control of the Line, Tuner, CD and Tape inputs.

3. Bass Tone Control:

     Adjust clockwise to increase or anti-clockwise to decrease the low frequency (bass) contour for   

     the overall system.

4. Treble Tone Control:

    Adjust clockwise to increase or anti-clockwise to decrease the high frequency (treble) contour   

    for the overall system.

5. Master Volume Control:

    Level (volume) control for the overall system. Turn clockwise to increase the volume, turn anti-

    clockwise to decrease the volume.

6. Power On/Off Switch:

    Switch to the “I” position to switch the amplifier on, switch to the “O” position to switch the 

    amplifier off. The amplifier should be powered off while before any connections are made.

7. Power LED:

    Indicates the mixer amplifier is powered on and ready for use. If the Power LED is not lit please  

    check the fault finding table in this manual.

8. Output Level Indicator:

    Five segment LED indicator array to indicate the output state of the amplifier. During normal 

    operation the Green LED’s should illuminate with only occasional illumination of the Orange 

    segment. Should the Red (Peak) LED illuminate the output level of the amplifier needs to be 

    reduced using the Master Volume Control (5).

9. Tape Selector Switch:

    Press to select Tape input as music (AUX) source. Pressing this selector switch will release the  

    other AUX inputs.

10. CD Selector Switch:

      Press to select CD input as music source. Pressing this selector switch will release the other   

      AUX inputs.



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11. Tuner Selector Switch:

     Press to select Tuner input as music source. Pressing this selector switch will release 

     the other AUX inputs.

12. Line Selector Switch:

      Press to select Tuner input as music source. Pressing this selector switch will release the 

      other AUX inputs.

13. Mains Power Inlet:  

      Connect the amplifier only after having made sure that the right voltage (240V) is supplied and 

      that the ground lead is earthed. This product falls under Class 1. Do not detach the 

      ground lead.

14. Mains Fuse


Should the mains fuse require replacement use a direct replacement of the same value 


15. XLR MIC Inputs:

      Balanced XLR inputs suitable for dynamic or condenser microphones. Each microphone input    

      features gain control (16) and Phantom Power (28). When adjusting the input gain, 

      make certain that the levels are not set too high, or distortion will result.

16. Microphone Gain Controls:


Adjustable gain controls allowing input levels to be matched. If the microphone signal sounds   

     distorted decrease the input signal level by turning the gain adjustment anti-clockwise.

17. Tape, CD, Tuner and Line Inputs:

      Line level audio inputs suitable for use with a variety of music sources. Input connectors are 

      unbalanced phono sockets. When adjusting the input gain, make certain that the levels are not 

      set too high, or distortion will result.

18. Record Output Sockets:

      Fixed level line out sockets suitable for use with audio recorders or for input into Induction    

      Loop systems.

19. Amp Input Socket:

      This input connects an external mixer or preamp with the unit’s power amp. Removing the 

      solid link between Amp In and Pre-Out will disconnect all input signal from the unit’s internal 

      mixer. Only signal from the external source will be heard. A typical application for this would be 

      to use a large, multi-input mixer externally and then utilising the MA Series internal amplifier as 

      a power amplifier only.

20. Pre-Out Output Socket:

      This output connects the unit with an external power amplifier. Removing the solid link  

      between Amp In and Pre-Out jack will disconnect signal to the unit’s power amp, sending the 

      output of the internal mixer to the external amplifier. A typical application for this would be 

      to use the internal mixer function of the MA Series amplifier and then feed the signal to a 

      larger external power amplifier.

21. Chime Trigger:

      Pressing this switch activates the one shot chime.

22. Speaker Output Terminals:

      The MA Series is fitted with a Phoenix type speaker terminal to facilitate easier connections   

      within tight spaces. Only one pair of terminals can be used at any one time (ie COM+4-16 ohm 

      OR COM+50V OR COM+70V OR COM+100V). Do not use both low impedance (4-16 ohm) 

      and 50/70/100V outputs simultaneously.

23. Mix Output Socket:

      Balanced XLR line level output suitable signal output to slave amplifiers.

24. Chime Volume Control:

      Volume (level) control for the built-in chime function.

25. Microphone Priority Dipswitches:

      Each of the microphone inputs can be allocated a priority function to override the Line level

      inputs (17). Move the dipswitch to the ON position for the corresponding microphone input. 

      Mic1 will always have the highest priority and will override other Mic inputs.



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26. Chime Tone Selector:

      The MA series mixer amplifier features two selectable Chime tones.

27. Phantom Power:

      Selectable phantom power for each of the four microphone inputs, the phantom power is     

      generally used to power condenser type microphones. All cabling and connections must be 

      fully balanced and wired with 2-core screened cable while using phantom power. Connections 

      must be made and phantom power switched on before powering the amplifier on.

28. DC Power Input:

      The MA Series features a DC power input for use with battery backup systems or for use from  

      high capacity batteries in remote locations. 

Rack Installation

The MA Series are rack mountable. The rack you use should be a double door rack where you 

can open the front and rear panel. When mounting the amplifier into the rack, please make sure 

that there is enough space around the amplifier. 

Be careful when mounting the amplifier into the rack. Put the heaviest products into the lower 

part of the rack. Be aware that fastening the amplifier with four screws on the front panel is not 



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.



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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 + 50V


   3) COM + 70V


   4) COM + 100V

Note: Please do not use more than one pair of output terminals

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” 

position. 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 

system components. 


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 Microphone inputs feature selectable & adjustable voice operated override (VOX), this will 

mute all other inputs. After 3 seconds of no input to the MIC inputs the other inputs will return to 

their original state. The VOX mute level can be adjusted on the rear panel. The TEL input has 

highest priority, followed by the MIC1.

3. The Clever Acoustics amplifiers 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. 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 




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Panel Connections:












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Speaker connections:


• 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 attache the supplied terminal cover attached after con-

nection. Because high voltage is applied to the speaker terminals, 

car 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

Total impedance

42Ω (MA 360)

21Ω (MA 3120)

10Ω (MA 3240)

Total impedance

160Ω (MA 360)

83Ω (MA 3120)

42Ω (MA 3240)

Total impedance

82Ω (MA 360)

41Ω (MA 3120)

20Ω (MA 3240)

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.



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Balanced XLR Jack Connection



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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.




Problem Chart


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

is dirty.

The input signal is too strong

Load impedance is to low


Check the power cord and any
extension cables

Check the power cord and if the 

plugs are properly connected with 

the sockets.

Clean the socket and/or the plug.

Reduce the input signal via the 

gain control.
Check load impedance vs amplifier 

specification, reduce as required.


No Power

No Sound


Distorted Sound



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