AMC DMPA Light 30 Manuale d'uso - Pagina 4
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Operation
Front panel functions
MIC 1 / AUX / PLAYER LEVEL CONTROLS
Rotary knobs for adjusting volume level of selected channel.
BASS & TREBLE TONE CONTROLS
Tone controls provide attenuation of bass and treble response. The flat
position is obtained when the knobs are set to middle position. Turn the knob
clockwise to raise tone level approximately +7.5 dB for bass and +10 dB for
treble; turn counter-clockwise to lower tone level by approximately -7.5 dB
for bass and +10 dB for treble.
AUX INPUT
3,5 mm stereo TRS input for auxiliary audio source. Select AUX input in media
player to play sound from this input. Volume is controlled with "PLAYER" level
control knob on the front panel.
MASTER VOLUME
Rotary knob for adjusting master volume.
Rear panel functions
MAIN POWER CONNECTOR AND FUSE
Power connector for mains power, combined with fuse holder. Use only the
same type of fuse that is written on the device.
POWER SWITCH
Switch amplifier power ON or OFF.
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USER MANUAL
DMPA Light Media Player Amplifier
Rear panel functions
LINE LEVEL AUDIO OUTPUT
RCA stereo output for connecting device to external audio amplifier or other
equipment.
AMPLIFIER OUTPUT DMPA 30/60
Audio outputs for Low impedance (4 Ω) and Hi-Z (100 V) speakers. Use the DIP
switch located in the rear next to microphone input to enable amplifiers output
type suitable for your installation. Only one output can be used at a time. Especially
for small background music systems, we recommend using 4 Ω output in order to
perform the best audio quality and frequency reproduction. Low Z output allows
connecting in parallel 4x16 Ω or 2x8 Ω loudspeakers. Amplifier's 4 Ω output
designed without output transformer and has 20 Hz-20 kHz frequency response to
sure the best possible audio quality for background.
AMPLIFIER OUTPUT DMPA 120/240
Audio outputs for Low impedance (2 Ω) and 100 V speakers. Be sure that correct
speaker output is enabled by using the DIP switch located in the rear next to the
microphone input. Only one output can be used at a time. Especially for small
background music systems, we recommend using 2 Ω output in order to perform
the best audio quality and frequency reproduction. Low Z output allows using
8x16 Ω loudspeakers or 4x8 Ω loudspeakers connected in parallel. Amplifier's 2 Ω
output designed without output transformer and has traditional 20 Hz-20 kHz
frequency responses to sure the best possible audio quality for background. Pay
attention to wiring on low Z output! Please use a minimum of 1.5 mm
2
to connect speakers to a short distance. Depending on audio line length, cable
diameter must be increased in order to minimize voltage drop on cable.
Operation
Rear panel functions
DMPA 120/240 LIGHT DC POWER SUPPLY INPUT
DC IN (V)
36
32
28
24
20
40
60
80
100 120 140
160 180
The amplifier can be powered using an external power source that provides
voltage from 24 V to 36 V DC power. This is useful for emergency situations
or when AC mains power is not available. Voltage in DC input affects the
maximum amplifier's power. Please check the table above. It shows the relation
between the amplifier's output power and the DC input voltage.
DMPA 30/60 LIGHT DC POWER SUPPLY INPUT
The amplifier can be powered using an external power source that provides
24 V DC voltage.
OUTPUT IMPEDANCE SELECTOR
This selector sets up amplifier outputs depending on audio system type.
100 V mode enables output transformer and sets up amplifier circuits to adjust
and amplify audio optimized for 100 V speaker lines. 4 Ω (DMPA 30/60) and 2 Ω
(DMPA 120/240) modes turn off the 100 V output transformer, in order to connect
cables
speaker lines directly from the power amplifier stage. This mode ensures the best
amplifier performance also enables 20 Hz-20 kHz frequency reproduction in order
to force low impedance loudspeakers to sound as best as they can.
AUX INPUT
RCA stereo input for connecting external audio source.
MIC INPUT
Phoenix connector for balanced microphone connection.
DMPA 120 Light
PHANTOM POWER AND INPUT PRIORITY
DMPA 240 Light
MIC input can provide 18 V phantom power for condenser microphones.
This input can also have a priority over other inputs.
EMERGENCY MUTE
200 220 240
P (W)
When 24 V DC current is supplied to EMG MUTE input, all device outputs will be
muted. This is useful when using device combined with external alarm systems.
Media player functions
LCD SCREEN
LCD screen displays main information about media player status: track number
and time, media player volume level, music source, FM frequency.
USB FLASH DRIVE
Supports up to 32 GB USB flash drives formatted in FAT32 file system.
MODE
Switch player between Bluetooth, FM and USB player modes.
FM ANTENNA
F-type connector for FM radio antenna.
USER MANUAL
DMPA Light Media Player Amplifier
05