AMC MMA 120X, User Manual, Page: 6 / 16

Functions description
FRONT PANEL MICROPHONE INPUT
This balanced 6,3mm jack input is in parallel to first microphone input in the rear panel. The gain and
phantom power for this input are selected by using gain control knob and phantom power switch located
in the rear panel. Please note: don’t use front and rear first microphone input at the same time.
SLOT FOR MUSIC SOURCE MODULE
This slot is designed to install music source module to amplifiers. Please find installation manual in page 8.
INPUT VOLUME CONTROL
These rotary knobs are for adjusting volume level of the audio inputs. All balanced XLR inputs are suitable for
line level as well as microphone level audio signals, if corresponding input gain is adjusted. The input gain
control is located in the rear panel.
SIREN AND CHIME SWITCH
There is designed siren and chime sound generator inside the amplifier. Press the siren or chime button
located in the front panel to activate it. Audio level can be adjusted by using Chime/Siren level control
located in the rear panel.
MASTER VOLUME CONTROL
This knob is designed to adjust main volume of the amplifier.
AUX INPUT
This stereo 3,5mm jack input is in parallel to sixth input in the rear panel. The gain potentiometer are
located in the rear panel.
ALL ZONE SELECTION SWITCH
This switch activates all zones for broadcasting announcement or background music.
ZONE SELECTION SWITCH
These switches controls amplifier’s output in order to broadcast announcement or background music to the
desired zone
.
EQUALIZER
Graphic equalizer allows to adjust sound frequency at 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, and 8kHz points
in ±12 dB range.
POWER SWITCH
Use this switch to power on or off the amplifier. The power LED in the front panel lights up if the amplifier
is powered on.
POWER INDICATOR
This LED indicates status of the main power. The LED lights up if the amplifier is powered on.
SIGNAL INDICATOR
LED in the front panel indicates audio signal of the amplifier.
PROTECT INDICATOR
This LED lights up for a few seconds after the amplifier is powered on and then turns off if the amplifier is
not damaged. It is normal for the protection LED to fade slowly when the amplifier is powered off.