AMC MA 21 User Manual - Page 6

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Operation

Function description of MA 21 amplifier

MIC INPUT LEVEL CONTROL

These rotary knobs are designed for adjusting volume level of the 3 pin and 5 pin

XLR inputs. First three inputs can be used for microphone level audio only.

LINE INPUT SELECTOR

This knob allows to select and broadcast to zone one of three audio source con-

nected to line level RCA inputs. Individually for both zones input selector gives a

opportunity to broadcast different background music to different zones.

LINE INPUT LEVEL CONTROL

These two knobs designed for adjusting volume level of line audio input.

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 bass

control knob (BASS) and treble tone control knob (TREBLE) clockwise to raise

tone level by approximately +10 dB; turn counterclockwise to lower tone level by

approximately -10 dB.

USER MANUAL

MA 21 Two zone mixing amplifier

MASTER LEVEL CONTROL

This potentiometer is designed to adjust audio level in the main output.

OUTPUT LEVEL INDICATOR

These two led bars indicates output signal amplitude of both zones. If the red led indi-

cator starts lighting continuously please decrease the sound volume by using master

control, because red led bar indicates too high signal level. First led in led bar is main

power indicator.

POWER SWITCH

Use this switch to power on or off the amplifier. Green led in the front panel led

bar lights up if the amplifier is powered.

MAIN POWER CONNECTOR AND FUSE

Power connector is designed for main powers connecting to amplifier. This con-

nector is combined with fuse holder and 4A 250V fuse.

MAIN VOLTAGE SELECTOR

Allows to select main power voltage. Set the proper voltage before the first time

turning on amplifier according to your area: ~115 V (60 Hz) or 230 V (50 Hz).