Adastra DM40 Digital 100V Mixer Amplifier System

1. Introduction

Thank you for choosing the Adastra DM40 Digital 100V Mixer Amplifier System. This system provides a comprehensive audio solution for various small to medium-sized installations, combining a powerful amplifier with versatile input options including USB, FM radio, and Bluetooth connectivity. The included Adastra BC3V-B background speakers are designed for clear audio reproduction and flexible installation.

This manual provides essential information for the safe and efficient operation of your Adastra DM40 system. Please read it thoroughly before installation and use, and retain it for future reference.

2. Safety Instructions

To prevent the risk of fire or electric shock, do not expose this appliance to rain or moisture. Do not open the casing. Refer all servicing to qualified personnel.

• Power Supply: Ensure the mains voltage is correct for the amplifier (230Vac, 50Hz). Use the supplied IEC power lead.
• Ventilation: Do not obstruct any ventilation openings. Ensure adequate airflow around the unit.
• Water & Moisture: Do not use this appliance near water or in damp environments. Do not place objects filled with liquids on the unit.
• Heat Sources: Keep the unit away from heat sources such as radiators, heat registers, stoves, or other apparatus that produce heat.
• Cleaning: Clean only with a dry cloth. Do not use liquid cleaners or aerosols.
• Overloading: Do not overload power outlets or extension cords, as this can result in a risk of fire or electric shock.
• Servicing: Do not attempt to service this product yourself. Opening or removing covers may expose you to dangerous voltages or other hazards.

3. Package Contents

Carefully unpack the system and check the contents to ensure all items are present and in good condition. If any items are missing or damaged, please contact your supplier immediately.

Figure 3.1: Complete Adastra DM40 System Package Contents

This image displays the full Adastra DM40 system package, including the DM40 digital mixer amplifier, four Adastra BC3V-B background speakers, and a roll of 100m speaker cable. This visual representation helps confirm all components are present upon unboxing.

• 1 x Adastra DM40 Digital 100V Mixer Amplifier
• 4 x Adastra BC3V-B Background Speakers
• 1 x 100m Speaker Cable
• 1 x IEC Mains Power Lead
• 1 x User Manual (this document)

4. Product Overview

4.1. DM40 Amplifier Front Panel Controls

Figure 4.1: Adastra DM40 Amplifier Front Panel

This image shows the front panel of the Adastra DM40 amplifier. Key features visible include the power switch, digital display, control buttons for media playback (Mode, Play/Pause, Previous, Next, Repeat), a USB port, and rotary controls for Treble, Bass, MP3/USB/FM volume, Aux volume, and Microphone volume, along with a 6.3mm microphone input jack.

• POWER Switch: Toggles the amplifier on/off.
• Digital Display: Shows current mode (USB, SD, FM, LINE) and track/station information.
• MODE Button: Switches between USB, FM, Bluetooth, and Line input modes.
• PLAY/PAUSE Button: Starts or pauses playback for USB/Bluetooth, or auto-scans for FM.
• PREVIOUS Button: Skips to the previous track/station.
• NEXT Button: Skips to the next track/station.
• REPEAT Button: Repeats current track or all tracks (USB mode).
• USB Port: For connecting USB flash drives with audio files.
• TREBLE Control: Adjusts high-frequency output.
• BASS Control: Adjusts low-frequency output.
• MP3/USB/FM Volume: Controls the volume level for the integrated media player.
• AUX Volume: Controls the volume level for the auxiliary input.
• MIC Volume: Controls the volume level for the microphone input.
• MIC Input: 6.3mm jack for connecting an unbalanced microphone.

4.2. DM40 Amplifier Rear Panel Connections

Figure 4.2: Adastra DM40 Amplifier Rear Panel

This image displays the rear panel of the Adastra DM40 amplifier, highlighting its various input and output connections. These include RCA line inputs (AUX IN), RCA line outputs (OUT), spring terminals for speaker connections (COM, 4-16 Ohms, 100V), an FM antenna terminal, and the IEC mains power inlet.

• AUX IN (RCA): Stereo RCA input for external audio sources (summed to mono).
• OUT (RCA): Stereo RCA line output for connecting to another amplifier or recording device.
• Speaker Outputs (Spring Terminals):
• COM: Common negative terminal for all speaker connections.
• 4-16 Ohms: Output for low impedance speakers (e.g., 8 Ohm speakers).
• 100V: Output for 100V line speakers.
• FM Antenna Terminal: Spring terminal for connecting the FM antenna wire.
• IEC Mains Inlet: For connecting the supplied power cable.

4.3. Adastra BC3V-B Background Speakers

Figure 4.3: Adastra BC3V-B Speaker Front View

This image shows the front view of a single Adastra BC3V-B background speaker, highlighting its sturdy metal grille and compact ABS housing. This speaker is designed for clear audio output in various indoor settings.

Figure 4.4: Adastra BC3V-B Speaker Rear View

This image displays the rear panel of the Adastra BC3V-B speaker, featuring the rotary selector switch for 100V line taps (6W, 3W, 1.5W) or 8 Ohm operation, and spring terminals for speaker wire connection. The adjustable mounting bracket is also visible.

The BC3V-B speakers are 2-way systems with a 75mm (3'') reinforced paper cone woofer and a 13mm (0.5'') polymer HF driver. They feature a rotary selector switch on the rear for choosing between 100V line taps (6W, 3W, 1.5W) or 8 Ohm operation. They come with an adjustable mounting bracket for wall or freestanding installation.

5. Setup

5.1. Speaker Connection

The DM40 amplifier supports both 100V line and 4-16 Ohm speaker connections. The BC3V-B speakers can be configured for either mode using their rear selector switch.

• 100V Line Connection: This is recommended for multiple speakers over long distances.
1. Set the rotary switch on each BC3V-B speaker to the desired 100V tap (6W, 3W, or 1.5W).
2. Connect the positive (+) terminal of each speaker to the '100V' terminal on the DM40 amplifier.
3. Connect the negative (-) terminal of each speaker to the 'COM' terminal on the DM40 amplifier.
4. Ensure the total wattage of all connected 100V speakers does not exceed the amplifier's output power (40W).
• 4-16 Ohm Connection: Use this for direct impedance matching, typically for fewer speakers over shorter distances.
1. Set the rotary switch on each BC3V-B speaker to '8 Ohms'.
2. Connect the positive (+) terminal of each speaker to the '4-16 Ohms' terminal on the DM40 amplifier.
3. Connect the negative (-) terminal of each speaker to the 'COM' terminal on the DM40 amplifier.
4. Ensure the total impedance of connected speakers is within the 4-16 Ohm range. For multiple 8 Ohm speakers, connect them in series-parallel to achieve a suitable total impedance.

Use the supplied 100m speaker cable for connections. Ensure correct polarity (+ to + and - to -) for optimal sound quality.

5.2. Audio Source Connection

• Auxiliary Input: Connect external audio devices (e.g., CD player, mixer) to the 'AUX IN' RCA jacks on the rear panel.
• Microphone Input: Connect an unbalanced microphone to the 6.3mm 'MIC' jack on the front panel.
• USB Media: Insert a USB flash drive containing MP3 audio files into the 'USB' port on the front panel.
• FM Antenna: Connect the supplied FM antenna wire to the 'FM' spring terminal on the rear panel for radio reception.

5.3. Power Connection

Connect the supplied IEC mains power lead to the 'IEC Mains Inlet' on the rear panel of the DM40 amplifier and then to a suitable 230Vac, 50Hz power outlet.

6. Operating Instructions

6.1. Powering On/Off

Press the 'POWER' switch on the front panel to turn the amplifier on or off. The digital display will illuminate when the unit is powered on.

6.2. Source Selection

Press the 'MODE' button on the front panel to cycle through the available input sources: USB, FM, Bluetooth, and Line (AUX).

6.3. USB Player Operation

• Insert a USB flash drive into the USB port. The unit will automatically switch to USB mode and begin playback.
• Use the 'PREVIOUS' and 'NEXT' buttons to skip tracks.
• Press 'PLAY/PAUSE' to pause or resume playback.
• Press 'REPEAT' to cycle through repeat modes (e.g., repeat one, repeat all).
• Adjust the 'MP3' volume control to set the output level.

6.4. FM Tuner Operation

• Switch to FM mode using the 'MODE' button.
• Press and hold the 'PLAY/PAUSE' button to initiate an automatic station scan. The tuner will scan and save available FM stations.
• Use the 'PREVIOUS' and 'NEXT' buttons to navigate through saved stations.
• Adjust the 'MP3' volume control to set the output level.

6.5. Bluetooth Pairing

• Switch to Bluetooth mode using the 'MODE' button. The display will show 'BT'.
• On your smartphone or tablet, enable Bluetooth and search for available devices.
• Select 'Adastra DM40' (or similar name) from the list of devices to pair.
• Once paired, you can play audio from your device wirelessly through the amplifier.
• Adjust the 'MP3' volume control to set the output level.

6.6. Auxiliary Input Operation

• Switch to Line mode using the 'MODE' button. The display will show 'LINE'.
• Play audio from your connected external device.
• Adjust the 'AUX' volume control to set the output level.

6.7. Microphone Operation

• Connect a microphone to the 'MIC' input jack.
• Adjust the 'MIC' volume control to set the microphone's output level.
• The microphone input is active regardless of the selected audio source, allowing for announcements or voice-overs.

6.8. Tone Controls

• Use the 'TREBLE' control to adjust the high-frequency response of the overall output.
• Use the 'BASS' control to adjust the low-frequency response of the overall output.

7. Maintenance

The Adastra DM40 system requires minimal maintenance. Follow these guidelines to ensure longevity and optimal performance:

• Cleaning: Wipe the amplifier and speakers with a soft, dry cloth. Do not use abrasive cleaners, waxes, or solvents.
• Ventilation: Periodically check that the ventilation openings on the amplifier are clear of dust and debris.
• Connections: Ensure all cable connections remain secure. Loose connections can lead to poor sound quality or intermittent operation.
• Storage: If storing the unit for an extended period, disconnect it from the power supply and store it in a cool, dry place away from direct sunlight and extreme temperatures.

8. Troubleshooting

9. Specifications

9.1. Adastra DM40 Amplifier

9.2. Adastra BC3V-B Background Speakers (per unit)

10. Warranty and Support

Specific warranty information for the Adastra DM40 Digital 100V Mixer Amplifier System is not provided within this manual. Please refer to your purchase documentation or contact your retailer or the manufacturer, Adastra, for details regarding warranty coverage and support services.

For technical assistance or inquiries, please visit the official Adastra website or contact their customer support channels.