1. Introduction
Thank you for choosing the BOMGE BMG22 USB Audio Interface. This device is a high-performance 32-bit/192KHz sound card designed to provide exceptional audio quality for recording and streaming. Featuring 48V phantom power, a durable metal case, and versatile connectivity, it is an ideal solution for guitarists, singers, podcasters, and other audio enthusiasts.
This manual will guide you through the setup, operation, and maintenance of your BMG22 audio interface to ensure optimal performance and longevity.
2. Key Features
- High-Resolution Audio: Supports up to 32-bit/192KHz sampling rate for pristine sound quality.
- 48V Phantom Power: Provides power for condenser microphones, ensuring clear and detailed vocal recordings.
- Dual Inputs: Two combo XLR/TRS inputs for microphones, line-level instruments, or Hi-Z instruments like guitars.
- Direct Monitoring: Allows for zero-latency monitoring of your input signals.
- Loopback Function: Enables recording of computer audio simultaneously with your inputs, perfect for live streaming and podcasting.
- Durable Construction: Housed in a robust metal case for enhanced durability and shielding.
- USB Powered: Flexible power options via USB, DC 5V adapter, or mobile power bank.
- Independent Volume Controls: Separate controls for main output and headphone monitoring.
3. Package Contents
Please check the box for the following items:
- BOMGE BMG22 USB Audio Interface
- USB Cable
- User Manual
Note: An inbox power adapter is NOT included. The device can be powered via USB from a computer, a standard 5V DC USB charger, or a mobile power bank.
4. Panel Overview
Familiarize yourself with the controls and ports on your BMG22 audio interface.
Figure 4.1: Front and Rear Panel Details
Front Panel
- Input 1 / Input 2 (Mic/Line/XLR Input Interface): Combo jacks for connecting microphones (XLR) or line-level/instrument signals (TRS).
- Input 1/2 HI-Z Switch: Activates high impedance mode for direct connection of guitars or other instruments.
- Gain 1 / Gain 2 Knobs: Adjust the input level for Input 1 and Input 2 respectively.
- OL (Overload) Indicators: Lights up when the input signal is too high, indicating potential clipping.
- Direct Monitor Switch: Toggles direct monitoring on/off. When on, you hear your input signal directly without latency.
- Power Indicator: Illuminates when the device is powered on.
- +48V Switch: Activates 48V phantom power for condenser microphones connected to Input 1.
- Output Knob: Controls the main output volume.
- Headphone Jack: 3.5mm stereo output for headphones.
- Headphone Volume Adjustment: Controls the volume for the headphone output.
Rear Panel
- USB Port: Connects to your computer for data transfer and power.
- Power Source Switch: Selects between USB power or external DC 5V power.
- DC 5V Input: For connecting an external 5V DC power adapter (not included).
- Loopback Switch: Activates the loopback function.
- MIC 1 48V Switch: Activates 48V phantom power for Input 1. (Note: This is a duplicate label from the front panel image, but refers to the same function).
- Outputs 2(R) / 1(L): RCA outputs for connecting to active speakers or an amplifier.
5. Setup Guide
5.1 Powering the Device
The BMG22 can be powered in several ways:
- Via Computer USB: Connect the USB cable from the BMG22's USB port to a USB port on your computer. Ensure the 'Power Source' switch on the rear panel is set to 'USB'.
- Via DC 5V Adapter: Connect a standard 5V DC power adapter (not included) to the 'DC 5V' input. Ensure the 'Power Source' switch on the rear panel is set to 'DC 5V'.
- Via Mobile Power Bank: Connect a mobile power bank to the 'DC 5V' input. Ensure the 'Power Source' switch on the rear panel is set to 'DC 5V'.
Figure 5.1: Multiple Power Supply Methods
5.2 Connecting to a Computer
Connect the BMG22 to your computer using the provided USB cable. The device is plug-and-play for most operating systems (Windows, macOS) and should be recognized automatically. No special drivers are typically required.
Figure 5.2: Connecting to Computer and Speakers
5.3 Connecting Input Devices (Microphones, Instruments)
Use the front panel's combo jacks (Input 1 and Input 2) to connect your audio sources.
- Microphones: Connect XLR microphones directly. For condenser microphones, ensure the +48V switch is engaged (see Section 6.2).
- Keyboards/Line-level Instruments: Connect using 1/4-inch TRS cables.
- Guitars/Basses: Connect using 1/4-inch TS cables. Engage the 'HI-Z' switch for the corresponding input to optimize the impedance for instruments.
Figure 5.3: Connecting Microphones, Instruments, and Headphones
5.4 Connecting Output Devices (Speakers, Headphones)
- Speakers: Connect your active speakers to the RCA 'Outputs 2(R) / 1(L)' on the rear panel.
- Headphones: Plug your headphones into the 3.5mm 'Headphone Jack' on the front panel.
6. Operation
6.1 Adjusting Input Gain
Use the 'Gain 1' and 'Gain 2' knobs to set the input level for your connected microphones or instruments. Observe the 'OL' (Overload) indicators. If an 'OL' light flashes, reduce the gain to prevent clipping and distortion. Aim for a strong signal without the 'OL' light illuminating consistently.
6.2 Activating 48V Phantom Power
If you are using a condenser microphone, you will need to activate 48V phantom power. Press the '+48V' switch on the front panel. The indicator light will illuminate, providing power to Input 1. Ensure dynamic microphones do not have phantom power applied unless specifically designed for it.
Figure 6.1: Using 48V Phantom Power
6.3 Direct Monitoring
Engage the 'Direct Monitor' switch to hear your input signal directly through your headphones or speakers without any latency from your computer. This is crucial for recording to ensure accurate timing and performance.
6.4 Loopback Function
The 'Loopback' switch on the rear panel allows you to record or stream audio playing on your computer simultaneously with your microphone or instrument inputs. This is particularly useful for podcasts, live streams, or online lessons where you need to capture both your voice and computer audio (e.g., background music, video sound).
6.5 Output Volume Control
- Output Knob: Adjusts the overall volume level sent to your connected speakers via the RCA outputs.
- Headphone Volume Adjustment: Controls the volume for your headphones.
7. Specifications
| Feature | Detail |
|---|---|
| Brand Name | BOMGE |
| Model Number | BMG22 |
| Type | Mixers (USB Audio Interface) |
| Sampling Rate | 32-bit/192KHz |
| Phantom Power | 48V (for Input 1) |
| Power Source | USB (5V DC) or external 5V DC adapter |
| Built-in Battery | No |
| Inbox Adaptor | No |
| Origin | Mainland China |
8. Troubleshooting
- No Sound Output:
- Check all cable connections (USB, speakers, headphones).
- Ensure the BMG22 is selected as the default audio output device in your computer's sound settings.
- Verify the 'Output' and 'Headphone Volume' knobs are turned up.
- Confirm the 'Power' indicator is lit.
- No Input Signal:
- Check microphone/instrument cable connections.
- Ensure the 'Gain' knob for the active input is turned up.
- If using a condenser mic, verify +48V phantom power is engaged.
- If using a guitar, ensure the 'HI-Z' switch is engaged for the correct input.
- Check your computer's sound settings to ensure the BMG22 is selected as the input device.
- Distorted/Clipping Sound:
- Reduce the 'Gain' knob for the input. The 'OL' indicator should not light up consistently.
- Check the input level in your recording software.
- Latency during Recording:
- Engage the 'Direct Monitor' switch on the BMG22.
- Adjust buffer size settings in your Digital Audio Workstation (DAW) software.
9. User Tips
- Gain Staging: Always set your input gain levels carefully. Start with the gain low and gradually increase it until the 'OL' indicator flashes only on the loudest peaks, then back it off slightly. This ensures a strong signal without distortion.
- Software Setup: After connecting the BMG22 to your computer, ensure it is selected as both the input and output device in your operating system's sound settings and within your recording software (DAW).
- Cable Quality: Use high-quality XLR and TRS cables to minimize noise and ensure optimal signal transfer.
- Experiment with Loopback: The loopback function is powerful for streaming. Practice using it to balance your microphone audio with computer playback for a professional sound.
10. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the device. Do not use liquid cleaners or solvents, as they may damage the finish or internal components.
- Storage: When not in use, store the BMG22 in a cool, dry place away from direct sunlight and extreme temperatures.
- Cable Care: Avoid bending cables sharply or placing heavy objects on them to prevent damage.
11. Warranty and Support
Your BOMGE BMG22 USB Audio Interface is covered by a standard manufacturer's warranty. Please refer to the warranty card included with your product for specific terms and conditions. For technical support, troubleshooting assistance, or warranty claims, please contact your retailer or the BOMGE customer service department.
