www.cleveracoustics.co.uk
MA 4120 480W Mixer Amplifier
User Manual
6
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.
