Clever Acoustics MA 4120 MKII User Manual - User Manual

Download PDF User Manual

Full Text Searchable PDF User Manual

MA 4120 MKII 480W

4 Zone Mixer Amplifier

User Manual

Order code: CRAM33

MA 4120 MKII Mixer Amplifier

VOL

BASS

MUTE

TREBLE

GAIN

CH 1

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 2

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 3

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 4

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 5

-10

+10

-10

+10

-10

+10

PHONE

VOLUME

MONITOR

VOLUME

ZONE 3

MONITOR

ZONE 1

ZONE 2

ZONE 4

VOLUME

MONITOR

VOLUME

MONITOR

VOLUME

MONITOR

OFF

POWER

CH4

CH2

CH1

CH3

CH5
LINE

POWER INPUT:

110-240V~50/60Hz

110-120V~60Hz - FUSE: T12A 250V

220-240V~50/60Hz - FUSE: T6.3A 250V

SERIAL NUMBER

www.cleveracoustics.co.uk

WARNING:

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK.

DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN. NO USER

SERVICABLE PARTS INSIDE

MONITOR

LINE OUTPUT

MONITOR
1W 8Ω

PRIORITY

–

TEL PAGING

COM

GND

HOT

110-120V~

220-240V~

PHANTOM

LINE

MIC

PHANTOM

LINE

MIC

PHANTOM

LINE

MIC

PHANTOM

LINE

MIC

TEL

VOLUME

ZONE

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 1

–

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 2

–

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 3

–

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 4

–

POWER CONSUMPTION (max.): 550W

www.cleveracoustics.co.uk

MA 4120 480W Mixer Amplifier

User Manual

Safety advice

WARNING

FOR YOUR OWN SAFETY, PLEASE READ THIS USER MANUAL
CAREFULLY BEFORE YOUR INITIAL START-UP!

•  Before your initial start-up, please make sure that there is no damage caused during transportation.
•  Should there be any damage, 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 manual.

• Please note that damages caused by user modifications to this equipment are not subject to warranty.

IMPORTANT:

The manufacturer will not accept liability for any resulting damages caused by the non-observance
of this manual or any unauthorised modification to the equipment.

OPERATING DETERMINATIONS

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 and electric shocks etc.
Do not endanger your own safety and the safety of others!
Incorrect installation or use can cause serious damage to people and/or property.

• 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 unit.
•  Do not open the equipment and do not modify the unit.
•  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.
•  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 240V, 50Hz AC.

• 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 immediately and 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 connect power or 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, stop 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: Three years from date of purchase.

CAUTION!

KEEP THIS EQUIPMENT

AWAY FROM RAIN,

MOISTURE AND LIQUIDS

CAUTION!

TAKE CARE USING

THIS EQUIPMENT!
HIGH VOLTAGE-RISK

OF ELECTRIC SHOCK!!

www.cleveracoustics.co.uk

MA 4120 480W Mixer Amplifier

User Manual

Product overview & technical specifications

The MA 4120 MKII 4 Zone Mixer Amplifier is ideal for systems where multiple zones are required. Designed for

use in venues such as schools, churches, entertainment venues or commercial buildings, the MA 4120 MKII

offers multi zone audio routing coupled with four independent 120Wrms amplifiers. The MA 4120 MKII 4 zone

mixer amplifier has five input channels, each with selectable independent output routing, input gain, treble bass

and volume controls. Input channels 1 thru 4 are via XLR/Jack combo sockets, each with Line/Mic/Mic+Phantom

selection, input channel 5 is via a stereo line level input.
Four output zones each feature LED VU indicators, monitor selection and volume controls with outputs for line

level, low impedance (4-8Ω) and constant voltage speaker systems (25V, 75V & 100V). The on-board monitor

facility, selectable for each zone output features both a line level audio and 1W 8Ω loudspeaker output suitable for

driving a loudspeaker local to the MA 4120 MKII zone mixer.

• Four output zones each with level control and monitor selection
• Four independent 120Wrms amplifiers outputting to 4-8Ω or 25, 70, 100V
• Five input channels:

Channels 1-4 are via XLR/Jack combo sockets,
each with Line/Mic/Mic+Phantom selection (48V)
Channels 5 is via phono (RCA) stereo line level input

• 3U, 19” rackmount chassis
• Input gain, treble, bass and level controls
• Selectable output routing for all input channels
• Monitor function with level control and LED VU meter
• Output for monitor loudspeaker: 1W, 8Ω
• Headphone output with level control
• Telephone/paging input (zone selectable) with adjustable level
• Priority contact for music mute facility (CH4 and 5 mute, CH1-3 priority)
• VOX operated priority for TEL input
• CH1 input automatic VOX priority (internal jumper for priority override)
• Telephone and MIC1 (music mute facility)
• Input channel mute switches on front panel
• Line level MIX output
• Temperature controlled, variable speed fan cooling

MA 4120 MKII 480W 4 Zone Mixer Amplifier

MA 4120 MKII Mixer Amplifier

VOL

BASS

MUTE

TREBLE

GAIN

CH 1

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 2

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 3

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 4

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 5

-10

+10

-10

+10

-10

+10

PHONE

VOLUME

MONITOR

VOLUME

ZONE 3

MONITOR

ZONE 1

ZONE 2

ZONE 4

VOLUME

MONITOR

VOLUME

MONITOR

VOLUME

MONITOR

OFF

POWER

CH4

CH2

CH1

CH3

CH5
LINE

POWER INPUT:

110-240V~50/60Hz

110-120V~60Hz - FUSE: T12A 250V

220-240V~50/60Hz - FUSE: T6.3A 250V

SERIAL NUMBER

www.cleveracoustics.co.uk

WARNING:

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK.

DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN. NO USER

SERVICABLE PARTS INSIDE

MONITOR

LINE OUTPUT

MONITOR
1W 8Ω

PRIORITY

–

TEL PAGING

COM

GND

HOT

110-120V~

220-240V~

PHANTOM

LINE

MIC

PHANTOM

LINE

MIC

PHANTOM

LINE

MIC

PHANTOM

LINE

MIC

TEL

VOLUME

ZONE

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 1

–

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 2

–

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 3

–

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 4

–

POWER CONSUMPTION (max.): 550W

Specifications

MA 4120 480W Mixer Amplifier

Power output

4 x 120Wrms (4 x 240W peak)

Speaker outputs

25V, 70V, 100V and 4-8Ω

Sensitivity

- CH1–4: —50dB (Mic/Phantom),
-10dB (Line)
- CH5: -10dB (unbalanced)

Frequency response

60Hz-17kHz (±3dB)

Tone control

±10dB-100Hz/±10dB-10kHz
(bass/treble)

S/N ratio

>65dB (Mic), >75dB (Line),
>65dB (TEL)

THD

<1% (@1kHz 1W output)

Power consumption

550W (max.)

Power supply

110-240V~50/60Hz AC

Fuse

T6.3A 250V

Dimensions

135 x 484 x 395mm

Weight

22kg

Order code

CRAM33

CH 1

-10

+10

-10

+10

-10

+10

CH 2

-10

+10

-10

+10

-10

+10

CH 3

-10

+10

-10

+10

-10

+10

CH 4

-10

+10

-10

+10

-10

+10

CH 5

-10

+10

-10

+10

-10

+10

PHONE

VOLUME

MONITOR

VOLUME

ZONE 3

MONITOR

ZONE 1

ZONE 2

ZONE 4

VOLUME

MONITOR

VOLUME

MONITOR

VOLUME

MONITOR

OFF

POWER

GAIN

MUTE

VOL

MA 4120 MKII Mixer Amplifier

35mm

484mm

395mm

www.cleveracoustics.co.uk

MA 4120 480W Mixer Amplifier

User Manual

Panel & connection identification

01 - Gain control
02 - HF level control
03 - LF level control
04 - Mute switch
05 - Mute LED
06 - Input channel level control
07 - Zone selection switches
08 - Headphone level control
09 - Headphone output
10 - LED VU output meter
11 - Monitor level control

12 - Zone output level control
13 - Monitor output selector
14 - Power LED
15 - Power switch
16 - Cooling fan
17 - AC mains power input
18 - AC mains fuse
19 - AC voltage selector
20 - Monitor (MIX) line output
21 - Monitor loudspeaker output

(1W 8Ω)

22 - Priority control terminals
23 - Telephone/paging input (TEL)
24 - Telephone/paging input

zone selection & volume control

25 - Stereo LINE inputs
26 - Mono MIC/LINE inputs
27 - Input sensitivity and phantom

power control

28 - Balanced line level zone outputs
29 - Power amplifier outputs

MA 4120 MKII Mixer Amplifier

VOL

BASS

MUTE

TREBLE

GAIN

CH 1

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 2

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 3

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 4

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 5

-10

+10

-10

+10

-10

+10

PHONE

VOLUME

MONITOR

VOLUME

ZONE 3

MONITOR

ZONE 1

ZONE 2

ZONE 4

VOLUME

MONITOR

VOLUME

MONITOR

VOLUME

MONITOR

OFF

POWER

CH4

CH2

CH1

CH3

CH5
LINE

POWER INPUT:

110-240V~50/60Hz

110-120V~60Hz - FUSE: T12A 250V

220-240V~50/60Hz - FUSE: T6.3A 250V

SERIAL NUMBER

www.cleveracoustics.co.uk

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK.

DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN. NO USER

SERVICABLE PARTS INSIDE

MONITOR

LINE OUTPUT

MONITOR
1W 8Ω

PRIORITY

–

TEL PAGING

COM

GND

HOT

110-120V~

220-240V~

PHANTOM

LINE

MIC

PHANTOM

LINE

MIC

PHANTOM

LINE

MIC

PHANTOM

LINE

MIC

TEL

VOLUME

ZONE

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 1

–

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 2

–

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 3

–

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 4

–

POWER CONSUMPTION (max.): 550W

19 20 21 22 23

26 27

17 18

MA 4120 MKII Mixer Amplifier

VOL

BASS

MUTE

TREBLE

GAIN

CH 1

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 2

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 3

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 4

-10

+10

-10

+10

-10

+10

VOL

BASS

MUTE

TREBLE

GAIN

CH 5

-10

+10

-10

+10

-10

+10

PHONE

VOLUME

MONITOR

VOLUME

ZONE 3

MONITOR

ZONE 1

ZONE 2

ZONE 4

VOLUME

MONITOR

VOLUME

MONITOR

VOLUME

MONITOR

OFF

POWER

CH4

CH2

CH1

CH3

CH5
LINE

POWER INPUT:

110-240V~50/60Hz

110-120V~60Hz - FUSE: T12A 250V

220-240V~50/60Hz - FUSE: T6.3A 250V

SERIAL NUMBER

www.cleveracoustics.co.uk

WARNING:

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK.

DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN. NO USER

SERVICABLE PARTS INSIDE

MONITOR

LINE OUTPUT

MONITOR
1W 8Ω

PRIORITY

–

TEL PAGING

COM

GND

HOT

110-120V~

220-240V~

PHANTOM

LINE

MIC

PHANTOM

LINE

MIC

PHANTOM

LINE

MIC

PHANTOM

LINE

MIC

TEL

VOLUME

ZONE

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 1

–

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 2

–

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 3

–

LINE OUT - BAL/UNBAL

POWER AMP OUTPUT

COM

4Ω

8Ω

25V

70V

100V

ZONE 4

–

POWER CONSUMPTION (max.): 550W

www.cleveracoustics.co.uk

MA 4120 480W Mixer Amplifier

User Manual

Layout identification:
1. Gain control:

The gain control is used to adjust the input gain (level) for each of the zone mixers input channels. Turn
the level control anti clockwise to the lowest setting, or turn clockwise to adjust to the highest setting.
Adjustments should be made gradually to avoid any sudden changes to the audio output. If the audio
source appears to sound distorted, a reduction in gain may be required.

2. HF level control:

During initial setup the high frequency tone adjustment should be set to the zero point (12’o’clock
position). Turn the level control anti clockwise to reduce the high frequency tones, or turn clockwise
to adjust the increase the high frequency tones. Adjustments should be made gradually to avoid any
sudden changes to the audio output.

3. LF level control:

During initial setup the low frequency tone adjustment should be set to the zero point (12’o’clock
position). Turn the level control anti clockwise to reduce the low frequency tones, or turn clockwise
to adjust the increase the high frequency tones. Adjustments should be made gradually to avoid any
sudden changes to the audio output.

4. Mute switch:

Press the mute switch to mute (silence) the selected input channel.

5. Mute LED:

The mute LED provides a visual indication when the input channel is in mute status.

6. Input channel level control:

7. Zone selection switches:

Each of the five input channels may be routed to any of the four output zones.
Press the switch to the IN position to route the selected input channel to the chosen output zone.

8. Headphone level control:

The headphone output volume is adjustable. Turn the level control anti clockwise to the lowest setting,
or turn clockwise to adjust to the highest setting.

9. Headphone output:

Utilising a standard 3.5mm stereo jack socket, the headphone output is used alongside the monitor
function to check the output of individual output zones. If none of the output zones are selected using
the monitor selection switches, the headphone output will be muted.

Operating instructions

www.cleveracoustics.co.uk

MA 4120 480W Mixer Amplifier

User Manual

Operating instructions

10. LED VU output meter:

The output to each zone may be monitored visually on the amplifier. The VU meter has three green
stages, followed by amber and then red. Care should be taken to avoid the signal level reaching the
amber or red zones as this will indicate a clipped signal within the zone mixer. In this instance, the Input
Channel and/or Zone Output Level should be reduced.

11. Monitor level control:

The monitor output volume is adjustable. Turn the level control anti clockwise to the lowest setting,
or turn clockwise to adjust to the highest setting. This is used to control the volume for the 1W 8Ω
loudspeaker output on the rear panel of the zone mixer.

12. Zone output level control:

The master volume control affects all audio sources within the amplifier, routed to the selected zone.
Turn the level control anti clockwise to the lowest setting, or turn clockwise to adjust the overall output
to the highest setting. Adjustments should be made gradually to avoid any sudden changes to the audio
output.

13. Monitor output selector:

To route one of the output zones to the monitor & headphone outputs, press the Monitor selection
button. The monitor output volume can then be adjusted using the Monitor Volume Control.

14. Power LED:

The Power LED will illuminate to indicate the zone mixer is powered on. If the power LED is not
illuminated, check first the position of the on/off switch and then check the mains (including fuse) or DC
power supply.

15. Power switch:

On/Off control for the zone amplifier. Note: The on/off power switch does not have any control over the
24V DC power input.

16. Cooling fan:

The MA 4120 MKII is fan cooled. The cooling fan will start when the internal temperature sensor
reaches 50°C. The fan speed will vary according to the internal temperature of the amplifier. Do not
block or obstruct the fan port on the rear panel or the air vents on the top or side panels.

17. AC mains power input:

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.

18. AC mains fuse:

Disconnect from the mains power supply before attempting to replace the mains fuse. Replacement
mains fuses must be the same rating as the original. T6.3AL 250V for 220-240V AC mains supply or
T12AL 250V for 110-120V AC mains supply.

www.cleveracoustics.co.uk

MA 4120 480W Mixer Amplifier

User Manual

Operating instructions

19. AC voltage selector:

The MA 4120 MKII zone mixer features a dual voltage mains input. Disconnect the unit from the mains
voltage power supply before attempting to change the mains input voltage. Care should be taken to
select the appropriate mains input voltage to match that of the mains supply voltage.

20. Monitor (MIX) line output:

The monitor line output can be used to feed external amplification or recording equipment. The Monitor
line output provides an unbalanced (4V) signal following the front panel “monitor” selection. If several
zones are selected, the output will be a mixed signal of all the selected zones.

21. Monitor loudspeaker output (1W 8Ω):

Auxiliary connection for the connection of a small external loudspeaker for local monitoring purposes.
The nominal output is 1W with a minimum impedance of 8Ω. If none of the output zones are selected
using the monitor selection switches, the headphone output will be muted.

22. Priority control terminals (Music Mute):

When the terminals are short-circuited by means of a switch or relay (ie fire alarm panel), input
channels CH4 and CH5 will be muted, leaving input channels CH1, CH2 and CH3 with priority status.
Note: The TEL input carries highest priority and will override the Priority (Music Mute) function.

23. Telephone/paging input (TEL):

For emergency paging, the MA 4120 MKII is equipped with a balanced audio TEL input, activated
automatically upon the MA 4120 MKII detecting an audio signal present on the TEL input terminals.
The input carries the highest priority and will override all other inputs & priority functions on
the amplifier.

24. Telephone/paging input zone selection & volume control:

The TEL input features zone control and input volume control. To route the TEL signal to a desired
output zone, move the corresponding DIP switch to the down (ON) position. The input volume for the
TEL signal may be controlled by the recessed volume control potentiometer. For most applications, it
may be best practice to set the minimum possible level to prevent unwanted activation of the priority
input. Turn the potentiometer clockwise to increase the volume.

25. Stereo LINE inputs:

A stereo audio input is provided for sources such as FM Tuners, CD Players or MP3 Players. The input
features a pair of unbalanced phono (RCA) inputs suitable for line level audio input.

26. Mono MIC/LINE inputs:

Channels 1, 2, 3 & 4 all feature mono audio inputs, each with selector for use with MIC/MIC+Phantom/
Line signals. The audio input is designed to accept a balanced audio signal via XLR or 6.35mm (¼”)
TRS jack.
Channel 1 features automatic priority override over channels 2, 3 and 4. If this feature is not required,
the user must refer to a service technician who will be able to follow the instructions on page 9 to
defeat the voice priority function.

www.cleveracoustics.co.uk

MA 4120 480W Mixer Amplifier

User Manual

Operating instructions

27. Input sensitivity and phantom power control:

Channels 1, 2, 3 & 4 each feature switchable inputs for use with MIC/MIC+Phantom/Line signals. The
MIC positition is designed to accept a balanced, low level signal from a standard dynamic microphone
(5mV/1kΩ). The PHANTOM position is designed to provide 15V phantom power across XLR pins 2 & 3
for use with condenser microphones. The LINE position is for use with line level sources such as radio
microphone receivers, CD players and FM tuners (100mV/10kΩ), the signal may be inputted using
either the balanced XLR or balanced TRS 6.35mm (¼”) jack.

28. Balanced line level zone outputs:

The MA 4120 MKII features four, independent zone outputs each utilising barrier strip terminals for the
balanced audio output (1.7V). The line level outputs may be used to feed signal to external amplification
where additional amplification is required. If the amplifier connected only requires an unbalanced signal,
the output contacts “+” and “G” should be used.

29. Power amplifier outputs:

Each of the four output zones on the MA 4120 MKII features both low impedance and constant voltage
loudspeaker outputs. Each output zone may be used to output into either low impedance (4-8Ω) or
constant voltage (25V, 70V, 100V). Do not use more than one pair of output terminals on any one
output zone. Care should be taken when connecting to the outputs to ensure the load impedance is
above the minimum load specified for the output.

Power on/off procedure:

Prior to making any connection to the mains power or audio inputs/outputs, turn all level controls
counter clockwise to the

“0”

position and all tone (equaliser) controls to the mid (zero) point. Deselect

all monitor and zone selection controls.
Switch on the zone mixer and any audio sources (MP3 players, CD players, Microphones etc) before
powering the systems amplifier ON. The last product to be switched on should be the power/slave
amplifiers to prevent any unwanted noise or potential damage to speakers or amplifiers. If you wish
to power off the system, turn the amplifier’s master volume control counter clockwise to the

“0”

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.
After connecting all audio sources and powering on the system, adjust the level of each audio input,
select the zone routing in order to achieve the desired “mix” for each zone. 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 announcements can be clearly heard.

www.cleveracoustics.co.uk

MA 4120 480W Mixer Amplifier

User Manual

Operating instructions

MIC priority:

During normal operation the MA 4120 MKII features priority for MIC1 over the other microphone and
line inputs. For certain applications, the installation engineer may need to defeat the MIC1 priority
function. In order to do this, the product must be fully disconnected from any AC or DC power sources,
and disconnected from all inputs/outputs.
Remove the 15 screws from the outer casing as per the diagram below and keep in a safe location.
Remove the upper casing and place to one side. Locate the PCB towards the rear of the unit as pictured
below. Carefully move the jumper from the

"ON"

position to the

"OFF"

position. Refit the outer casing,

taking care to avoid damaging the unit. Refit all of the screws to fully secure the outer casing.

Top of Mixer

Rear of Mixer

Side 1 of

Mixer

Side 2 of

Mixer

www.cleveracoustics.co.uk

MA 4120 480W Mixer Amplifier

User Manual

Typical panel connections

Mains

Recorder

PA Amplifier

Recorder

CD Player

AM/FM Tuner

Desktop Mic

Microphone

Monitor

Speaker

Amplifier

Contact

“Voice Priority”

Horn

speaker

Column

speaker

Speaker

www.cleveracoustics.co.uk

MA 4120 480W Mixer Amplifier

User Manual

Rack installation:

The MA series is 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.
The front panel is not designed to absorb acceleration forces occurring during transportation.

Inputs:

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.

Outputs:

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

Note: Please do not use more than one pair of output terminals on any one output zone.

Installation

www.cleveracoustics.co.uk

MA 4120 480W Mixer Amplifier

User Manual

WEEE notice

Correct Disposal of this Product
(Waste Electrical & Electronic Equipment)

(Applicable in the European Union and other European countries
with separate collection systems)

This marking shown on the product or its literature, indicates that it should not be disposed
with other household wastes at the end of its working life. To prevent possible harm to the
environment or human health from uncontrolled waste disposal, please separate this from other
types of wastes and recycle it responsibly to promote the sustainable reuse of material resources.

Household users should contact either the retailer where they purchased this product, or their
local government office, for details of where and how they can take this item for environmentally
safe recycling.

Business users should contact their supplier and check the terms and conditions of the
purchase contract. This product should not be mixed with other commercial wastes for disposal.

Ask a Question ?