1. Introduction
Thank you for choosing the BOMGE BMG-04D 4-Channel Audio Sound Mixer. This compact and versatile mixer is designed for various audio applications, including live performances, home studios, podcasting, and DJing. It features 4 input channels, 48V phantom power for condenser microphones, 99 built-in DSP effects, USB connectivity for recording and playback, and Bluetooth wireless transmission.
Please read this manual thoroughly before operating the device to ensure proper use and to maximize its performance and longevity.
2. Important Safety Information
- Do not expose this unit to rain or moisture to avoid fire or shock hazard.
- Do not open the casing. There are no user-serviceable parts inside. Refer all servicing to qualified personnel.
- Ensure the power source matches the requirements specified for the unit.
- Disconnect the power adapter during lightning storms or when unused for long periods.
- Keep the unit away from heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
- Clean only with a dry cloth.
3. Package Contents
Please check the package carefully to ensure all items are present and in good condition:
- BOMGE BMG-04D Audio Sound Mixer
- USB Power Cable (Type-C)
- User Manual
Note: An inbox adaptor is NOT included. You will need a standard 5V USB power supply (e.g., a phone charger, power bank, or computer USB port) to power the device.
4. Product Features
- 4-Channel Input: Two MIC/LINE (XLR/6.35mm combo) inputs and one stereo LINE (RCA/USB) input.
- 48V Phantom Power: Supports professional condenser microphones.
- 99 DSP Effects: Built-in digital multi-effects processor for enhanced sound.
- USB 2.0 Interface: Connects to a computer for recording and playback, or to a USB flash drive for MP3 playback/recording.
- Bluetooth Connectivity: Wireless audio streaming from compatible devices.
- 2-Band EQ: Independent HIGH and LOW frequency adjustment for each channel.
- 5V Power Input: Conveniently powered via USB Type-C from various sources.
- Compact Design: Portable and easy to integrate into any setup.
5. Controls and Connections
- MIC/LINE Inputs (1 & 2): Combo jacks for XLR microphones or 6.35mm (1/4 inch) line-level instruments/devices.
- +48V Phantom Power Switch: Activates 48V phantom power for condenser microphones on channels 1 and 2.
- REC (L/R) Input: RCA inputs for external recording devices.
- IN L/R (3/4) Input: RCA inputs for stereo line-level devices.
- OUT-L (BALANCED) OUT-R: XLR balanced outputs for connecting to main speakers or amplifiers.
- 6.35mm Output: Unbalanced 6.35mm (1/4 inch) outputs.
- PHONES: 6.35mm (1/4 inch) stereo headphone jack.
- GAIN Knobs: Adjust the input sensitivity for channels 1 and 2.
- HIGH Knobs: Adjust the high-frequency (treble) EQ for channels 1 and 2.
- LOW Knobs: Adjust the low-frequency (bass) EQ for channels 1 and 2.
- EFF Knobs: Adjust the amount of effect sent from channels 1 and 2 to the DSP processor.
- PEAK Indicators: Light up when the input signal is too high, indicating potential clipping.
- LEVEL Knobs (1 & 2): Adjust the individual volume levels for channels 1 and 2.
- 3/4 MP3/USB Level Knob: Adjusts the volume level for the 3/4 channel (RCA/USB/Bluetooth input).
- FX VOL Knob: Adjusts the overall volume of the DSP effects.
- MAIN OUT Volume Control: Adjusts the overall output volume of the mixer.
- PHONES Volume Control: Adjusts the volume for the headphone output.
- U-DISK (MP3/USB) Section:
- BT Button: Activates Bluetooth pairing mode.
- REC Button: Initiates recording to a USB flash drive.
- REPEAT Button: Toggles repeat mode for MP3 playback.
- Previous/Next Buttons: Navigate tracks during MP3 playback.
- Play/Pause Button: Controls MP3 playback.
- MODE Button: Switches between USB Audio (PC), Bluetooth, and MP3 playback modes.
- DSP Display: Shows the selected DSP effect number.
- PKI Indicator: Peak indicator for the USB/MP3 section.
- SIG Indicator: Signal indicator for the USB/MP3 section.
- POWER Button: Power on/off for the U-DISK section.
- Type-C Power Input: Connects to a 5V USB power source.
- MP3/PC Mode Switch: Toggles between MP3 playback from USB flash drive and USB Audio interface mode for computer connection.
6. Setup Guide
6.1 Power Connection
- Locate the USB Type-C power input on the side of the mixer.
- Connect the provided USB power cable to the mixer.
- Connect the other end of the USB cable to a 5V USB power source (e.g., a computer USB port, a USB wall adapter, or a power bank). Ensure the power source can provide sufficient current for stable operation.
6.2 Connecting Audio Devices
Before connecting any devices, ensure the mixer's main output and channel level controls are set to their minimum positions to prevent sudden loud noises.
6.2.1 Microphones
- For dynamic microphones, connect an XLR cable to the MIC/LINE input (1 or 2).
- For condenser microphones, connect an XLR cable to the MIC/LINE input (1 or 2). Press the +48V PHANTOM POWER switch to supply power. The indicator light will illuminate.
6.2.2 Line-Level Instruments/Devices
- Connect instruments (e.g., keyboards, guitars with preamps) or other line-level devices using 6.35mm (1/4 inch) cables to the MIC/LINE inputs (1 or 2).
- For stereo line-level devices, use RCA cables to connect to the IN L/R (3/4) inputs.
6.3 Output Connections
- Main Output: Connect the OUT-L (BALANCED) OUT-R XLR outputs to your main speakers, power amplifier, or recording interface. Alternatively, use the 6.35mm outputs.
- Headphones: Plug your headphones into the PHONES jack.
6.4 USB Connection to Computer
- Connect a USB cable from the mixer's USB port to your computer.
- Set the MP3/PC Mode Switch to 'PC'.
- The mixer will be recognized as an audio interface by your computer. You may need to select it as the input/output device in your operating system's sound settings or your Digital Audio Workstation (DAW) software.
6.5 Bluetooth Pairing
- Press the 'BT' button in the U-DISK section. The Bluetooth indicator will flash, indicating pairing mode.
- On your Bluetooth-enabled device (e.g., smartphone, tablet), search for available devices and select 'BMG-04D'.
- Once connected, the Bluetooth indicator will stop flashing and remain solid. You can now stream audio wirelessly to the mixer.
7. Operating Instructions
7.1 Basic Mixing
- Power On: Ensure all connections are secure and volume controls are at minimum. Power on the mixer.
- Adjust Gain: For each active channel (1, 2, or 3/4), slowly increase the GAIN knob until the PEAK indicator flashes only occasionally during the loudest parts of the signal. If it stays lit, the signal is too hot; reduce gain.
- Adjust EQ: Use the HIGH and LOW EQ knobs to shape the tone of each channel. Turn clockwise to boost frequencies, counter-clockwise to cut them.
- Apply Effects: Turn the EFF knob on channels 1 or 2 to send signal to the DSP effects processor. Adjust the overall effect volume with the FX VOL knob.
- Set Channel Levels: Use the LEVEL knobs for channels 1, 2, and the 3/4 MP3/USB Level knob to balance the volume of each input source.
- Main Output Volume: Slowly increase the MAIN OUT volume control to achieve the desired overall output level.
- Headphone Monitoring: Adjust the PHONES volume control for comfortable monitoring through headphones.
7.2 DSP Effects
The BMG-04D features 99 built-in DSP effects. To select an effect:
- Press the MODE button in the U-DISK section until the DSP display shows the effect number.
- Turn the REPEAT/FX VOL knob to cycle through the effect numbers (01-99).
- Once the desired effect is displayed, it is active.
The effects are categorized as follows:
| Effect Range | Effect Type |
|---|---|
| 01-27 | Reverb |
| 28-53 | Early Ref/Delay |
| 54-63 | Echo |
| 64-72 | Chorus/Flange |
| 73-75 | Tremolo |
| 76-78 | Wah-Wah |
| 79-81 | Radio voice |
| 82-89 | Pitch shifter |
| 90-95 | Dis/Odr (Distortion/Overdrive) |
| 96-99 | Multi FX |
7.3 USB Playback and Recording
7.3.1 USB Flash Drive (U-DISK) Playback
- Insert a USB flash drive containing MP3 audio files into the USB port.
- Set the MP3/PC Mode Switch to 'MP3'.
- Use the Play/Pause, Previous, Next, and REPEAT buttons in the U-DISK section to control playback.
7.3.2 USB Flash Drive (U-DISK) Recording
- Insert a USB flash drive into the USB port.
- Set the MP3/PC Mode Switch to 'MP3'.
- Press the REC button in the U-DISK section to start recording the main mix to the USB flash drive. Press again to stop.
7.3.3 Computer Recording/Playback
- Connect the mixer to your computer via USB and set the MP3/PC Mode Switch to 'PC'.
- In your computer's sound settings or DAW, select the mixer as the audio input/output device.
- You can now record the mixer's main output to your computer or play audio from your computer through the mixer.
8. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the mixer. Do not use liquid cleaners, solvents, or abrasive materials, as they may damage the finish or internal components.
- Storage: When not in use, store the mixer in a cool, dry place, away from direct sunlight and extreme temperatures.
- Cable Management: Avoid bending or crimping cables excessively. Store cables neatly to prevent damage.
- Dust Protection: Keep the mixer covered when not in use to prevent dust accumulation, especially in the faders and knobs.
9. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound output | Main OUT volume is low/off; Channel LEVEL is low/off; Cables are not connected properly; Speakers are off/muted. | Check MAIN OUT and channel LEVEL knobs. Ensure all audio cables are securely connected. Verify speakers are powered on and unmuted. |
| No sound from microphone | GAIN is too low; +48V Phantom Power is not activated for condenser mics; Microphone is faulty; Cable is faulty. | Increase GAIN. Activate +48V Phantom Power for condenser microphones. Test with another microphone or cable. |
| PEAK indicator constantly lit | Input signal is too strong. | Reduce the GAIN knob for that channel until the PEAK light only flashes occasionally. |
| Bluetooth not connecting | Mixer is not in pairing mode; Device is too far; Interference. | Press the 'BT' button to enter pairing mode (indicator flashes). Ensure your device is within range. Try re-pairing. |
| USB recording/playback not working | MP3/PC Mode Switch is incorrect; USB flash drive is not formatted correctly or full; Computer not recognizing mixer. | Ensure MP3/PC Mode Switch is set correctly. Check USB flash drive format (FAT32 recommended) and free space. For PC, verify mixer is selected as audio device in computer settings. |
10. Specifications
| Feature | Detail |
|---|---|
| Model Number | BMG-04D |
| Type | Audio Mixer |
| Brand | BOMGE |
| Channels | 4 (2 Mono MIC/LINE, 1 Stereo LINE/USB/BT) |
| Phantom Power | +48V (for channels 1 & 2) |
| DSP Effects | 99 built-in effects (Reverb, Delay, Echo, Chorus, etc.) |
| Connectivity | USB 2.0, Bluetooth |
| Input Interfaces | XLR/6.35mm Combo, RCA |
| Output Interfaces | XLR Balanced, 6.35mm Unbalanced, 6.35mm Headphone |
| EQ | 2-Band (High, Low) per channel |
| Power Source | AC (via 5V USB Type-C input) |
| Built-in Battery | No |
| Dimensions (L x W x H) | 18.5 cm x 15.5 cm x 4.3 cm (approx. 7.2 in x 6.1 in x 1.6 in) |
| Weight | 0.633 kg (approx. 1.4 lbs) |
11. User Tips
- Impedance Matching: For optimal audio quality, ensure that the impedance of your input devices (microphones, instruments) is compatible with the mixer's input impedance. While the mixer is designed to be versatile, checking specific impedance values in your device manuals can help achieve the best sound.
- Power Supply: Since no power adapter is included, use a reliable 5V USB power source. A high-quality phone charger or a dedicated USB power supply is recommended for stable performance, especially when using phantom power.
- Cable Quality: Invest in good quality cables. Poor cables can introduce noise and degrade audio quality.
- Experiment with DSP: Don't be afraid to experiment with the 99 DSP effects. They can significantly enhance your sound. Start with subtle applications and adjust to taste.
- Monitor Levels: Always monitor your input and output levels using the PEAK indicators and your ears to prevent clipping and distortion.
12. Warranty and Support
For warranty information and technical support, please refer to the seller's policies or contact the BOMGE customer service directly. Keep your purchase receipt as proof of purchase.