AMC 136495 DMPA Light Media Player Amplifier User Manual

AMC 136495 DMPA Light Media Player Amplifier

Before you start

DMPA Light series device is a compact 1U half-rack size public address mixing amplifier, containing media player with AUX input, Bluetooth and FM radio receivers, 1 microphone input, emergency mute control. This system is designed for installations, such as gas stations, restaurants, convenience stores, where easy operation is appreciated.

FEATURES

• Compressed audio playback
• Supports up to 32 GB USB flash and SD cards
• Bluetooth and FM radio receivers
• 3 channel mixer with microphone and aux inputs
• Microphone input priority and phantom power
• RCA output
• Stereo RCA AUX input
• Emergency mute
• Amplifier output with phoenix connector
• Supports 100 V and low impedance speaker installations
• DMPA 120 & 240 Light supports 2 Ω speaker installations

Operation

Front Panel

1. MIC, AUX & Media player volume
2. Bass and treble controls
3. USB drive input
4. 3,5 mm AUX input
5. LCD display
6. Master volume
7. Mode button
8. Player control buttons
9. Repeat function button
10. Media player mute power button

Rear Panel

1. Mains power input & fuse holder
2. Power switch
3. Ground connecting point
4. Amplifier output
5. DC power supply input
6. RCA LINE output
7. RCA AUX input
8. Phantom power and mic input priority settings
9. Microphone input
10. 24 V emergency mute connector
11. FM antenna connector

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.

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 4×16 Ω or 2×8 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 8×16 Ω loudspeakers or 4×8 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 mm2 cables 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.

DC POWER SUPPLY INPUT

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.

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 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.

PHANTOM POWER AND INPUT PRIORITY
MIC input can provide 18 V phantom power for condenser microphones. This input can also have a priority over other inputs.

EMERGENCY MUTE
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.

PLAY/PAUSE
Switch player mode between play and pause. Hold this button at FM mode in order to start radio station auto scan. Press this button rapidly in order to toggle FM frequency auto/manual scanning mode.

FORWARD / BACKWARD
Single short press in music and Bluetooth modes will change currently playing track. Holding buttons for few seconds Increase or decrease volume level of media player. In FM mode use these buttons to change FM frequency in 0.1 MHz steps, also switch radio presets.

PLAY FROM USB
When a USB memory stick is inserted into the USB port, the track number and time will show in the display and audio files will start to play automatically.

REPEAT AND RANDOM PLAY
Select one of three modes:

• RTA – Repeat all tracks.
• RT1 – Repeat one track.
• RND – Random play
  Second function of this button is to save FM radio frequency to selected preset.

MUTE / POWER
Press this button to mute audio. Hold this button longer in order to turn off/on media player.

FM radio receiver
FM radio receiver allows to save 26 presets with selected radio stations. It uses the same control buttons, but with a different functionality (pictured below).

ENTER TO AUTO TUNING MODE
Press and hold Play/Pause button for few seconds to scan available stations and store them as presets. Press and hold Play/Pause button for few second to abort auto tuning. To step through presets, press the Previous or Next buttons.

ENTER TO MANUAL TUNING MODE Press Play/Pause button to enter manual tuning mode. Use Backward/Forward button to adjust frequency in 0.1 MHz steps. Press Repeat button to select preset number and change it by using Backward/Forward buttons. Press Repeat button again to save radio station to preset. Press Mute button to exit manual frequency adjusting without saving radio station preset.

Bluetooth

PAIR

1. Enter Bluetooth mode on your DMPA Light media player.
2. Open the Bluetooth settings menu on your mobile device and search for “AMC Player_0000” in the list of available devices.
3. Select “AMC Player_0000” and confirm that it is connected as an audio device.

CONTROL
Backward, Forward and Play/pause buttons control audio player on your mobile device. Holding the Backward or Forward buttons will adjust the output volume of the mobile device.

RENAME
Customize device Bluetooth name by holding Play/Pause button until “AMC Player_0000” is displayed. It is possible to change 4-digit part of the name. Press backward or Forward buttons to edit the number and Play/Pause to select another character. Hold Play/Pause to save changes and exit. Android devices have the facility to re-name devices within the Bluetooth settings menu. If the Bluetooth ID has been re-named on the Android device, editing the Bluetooth ID on the media player will not affect the name displayed on that Android device.

General Specifications

DMPA Light Media Player Amplifier

The specifications are correct at the time of printing this manual. For improvement purposes, all specifications for this unit, including design and appearance, are subject to change without prior notice.

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