Introduction
The VULKKANO D4 is a 2.0 audio system designed for use as computer speakers. It delivers a balanced and detailed sound experience suitable for music, movies, and gaming. This manual provides essential information for the proper setup, operation, and maintenance of your VULKKANO D4 speakers.
Safety Information
- Power Source: Use only the provided power adapter. Ensure the voltage matches your local power supply.
- Ventilation: Do not block any ventilation openings. Maintain adequate space around the speakers for proper airflow.
- Water and Moisture: Do not expose the speakers to water, rain, or excessive moisture. Avoid placing liquid-filled objects on or near the speakers.
- Heat: Keep the speakers away from heat sources such as radiators, heat registers, stoves, or other apparatus that produce heat.
- Cleaning: Disconnect the power before cleaning. Use a dry, soft cloth. Do not use liquid cleaners or aerosol cleaners.
- Servicing: Do not attempt to service this product yourself. Refer all servicing to qualified service personnel.
What's in the Box
Carefully unpack the box and ensure all items listed below are present and in good condition.

Image: Contents of the VULKKANO D4 speaker package.
- VULKKANO D4 Speakers (1 pair)
- Remote Control (Batteries included)
- USB A to USB A Cable
- 3.5mm to 3.5mm AUX Cable
- User Manual
- Speaker R/L Connection Cable
- Power Adapter
Setup
1. Speaker Placement
Place the speakers on a stable, flat surface, ideally at ear level when seated. For optimal stereo imaging, position the speakers equidistant from your listening position and spaced appropriately apart. Ensure there is enough space behind the speakers for cable connections and ventilation.

Image: VULKKANO D4 speakers in a typical desktop setup.
2. Connecting the Speakers
Connect the passive speaker to the active (main) speaker using the provided R/L connection cable. The active speaker typically has all the input ports and controls.

Image: Rear panel connections of the VULKKANO D4 active speaker.
3. Power Connection
Connect the power adapter to the 'DC IN' port on the active speaker, then plug the adapter into a wall outlet. The power indicator will light up.
Connectivity Options
The VULKKANO D4 speakers offer multiple connectivity options to suit various devices.

Image: Overview of VULKKANO D4 connectivity options.
Bluetooth Connection
- Turn on the speakers.
- Press the 'BT' button on the remote control or the input selection button on the speaker to select Bluetooth mode. The indicator light will flash.
- On your device (smartphone, tablet, computer), enable Bluetooth and search for 'VULKKANO D4'.
- Select 'VULKKANO D4' to pair. Once connected, the indicator light will stop flashing and remain solid.
RCA Connection
Use an RCA cable (not included) to connect your audio source (e.g., TV, DVD player) to the 'RCA' input ports on the active speaker. Select 'RCA' input using the remote or speaker controls.
AUX Connection
Connect your audio device (e.g., MP3 player, smartphone) to the 'AUX' input port on the active speaker using the provided 3.5mm AUX cable. Select 'AUX' input using the remote or speaker controls.
USB A Connection
Connect a USB device (e.g., computer) to the 'USB A' port on the active speaker using the provided USB A to USB A cable. Select 'USB' input using the remote or speaker controls.
Optical Connection
Use an optical cable (not included) to connect your audio source (e.g., TV, game console) to the 'OPT' (Optical) input port on the active speaker. Select 'OPT' input using the remote or speaker controls.
Subwoofer Output
The 'SUB OUT' port allows you to connect an external powered subwoofer (not included) for enhanced bass performance. Use an RCA cable to connect the subwoofer to this output.
Operating Instructions
Front Panel Controls
- Volume Knob: Rotate to adjust the overall volume level.
- TREB Knob: Rotate to adjust the treble (high frequency) level.
- BASS Knob: Rotate to adjust the bass (low frequency) level.
- Input/Mode Button: Press to cycle through available input sources (Bluetooth, RCA, AUX, USB, Optical).
- Power Button: Press to turn the speakers on or off.
Remote Control Functions
The included remote control provides convenient access to various functions:
- Power: Turn speakers on/off.
- Volume +/-: Increase or decrease volume.
- Mute: Mute or unmute audio.
- Input Selection Buttons (BT, AUX, USB, OPT, RCA): Directly select the desired input source.
- Treble/Bass +/-: Adjust treble and bass levels.
Maintenance
Cleaning
Before cleaning, ensure the speakers are turned off and unplugged from the power outlet. Use a soft, dry, lint-free cloth to wipe the surfaces. Do not use abrasive cleaners, waxes, or solvents as they may damage the finish.
Storage
If storing the speakers for an extended period, unplug them from the power source and store them in a cool, dry place, away from direct sunlight and extreme temperatures.
Troubleshooting
If you encounter issues with your VULKKANO D4 speakers, refer to the following common problems and solutions:
- No Sound:
- Ensure the speakers are powered on and the volume is not at minimum or muted.
- Verify that the correct input source is selected (Bluetooth, AUX, USB, Optical, RCA).
- Check all cable connections between the speakers and your audio source.
- Test with a different audio source or cable if possible.
- Bluetooth Not Connecting:
- Ensure the speakers are in Bluetooth pairing mode (indicator light flashing).
- Make sure Bluetooth is enabled on your device and it is within the 10-meter range.
- Forget 'VULKKANO D4' from your device's Bluetooth list and try pairing again.
- Restart both the speakers and your device.
- Distorted Audio:
- Reduce the volume on both the speakers and your audio source.
- Check for loose or damaged cables.
- Adjust the Bass and Treble controls to see if it improves sound quality.
- Remote Control Not Working:
- Ensure there are no obstructions between the remote and the speakers.
- Check and replace the batteries if necessary (2 AAA batteries).
Specifications
| Feature | Specification |
|---|---|
| Brand | VULKKANO |
| Model Name | Vulkkano D4 |
| Speaker Type | 2.0 Speaker System |
| Max Output Power | 80 Watts |
| Connectivity Technology | Bluetooth, RCA, AUX, USB A, Optical |
| Wireless Technology | Bluetooth |
| Bluetooth Range | 10 Meters |
| Audio Output Mode | Stereo |
| Woofer Driver Diameter | 4 Inches |
| Tweeter Driver Diameter | 1 Inch |
| Signal-to-Noise Ratio | 80 dB |
| Control Method | Remote Control |
| Power Source | AC Adapter |
| Material | Plastic, Metal |
| Dimensions (DxWxH) | 16.8D x 15W x 22.3H cm |
Warranty and Support
VULKKANO products are designed for reliability and performance. For warranty information, please refer to the warranty card included with your product or visit the official VULKKANO website. For technical support or service inquiries, please contact VULKKANO customer service through their official channels.




