1. Introduction
The TEYUN A4 is a versatile 4-channel audio mixer equipped with a built-in sound card, designed to meet the needs of home music production, live webcasting, K-song covers, and various other audio applications. Its compact and lightweight design, combined with flexible power options, makes it an ideal solution for both stationary and portable setups.
Key features include input gain and high/low bass adjustment, integrated 48V phantom power for condenser microphones, a high-definition headset output port, an MP3 player module, Bluetooth reception, and direct PC sound card connectivity.
Figure 1: TEYUN A4 4-Channel Audio Mixer
2. Product Overview
The TEYUN A4 mixer integrates essential audio controls and connectivity in a small form factor. It features multiple input channels, equalization controls, and effects processing capabilities.
2.1 Controls and Features
- Input Channels: 2 signal input channels and 1 stereo signal input channel.
- Outputs: 1 main channel output, 1 auxiliary channel output, and return connectors.
- Monitoring: Independent recording output and listening ports, headset monitor interface.
- Microphone Preamplifier: Low-noise, high-precision microphone preamplifier for clear sound quality.
- Phantom Power: Built-in 48V phantom power for condenser microphones.
- Equalization: 3-segment channel equalization (High, Mid, Low).
- Effects: Built-in professional reverb with delay and repeat effects.
- Level Display: Precision logarithmic double 10 LED level display.
- Media Playback: MP3 player module with USB interface and display function.
- Connectivity: Bluetooth reception for wireless audio streaming, direct PC sound card connection via USB.
- Power Supply: Flexible external switch power supply (AC100-240V AC) or USB power from PC/power bank.
Figure 2: Independent Equilibrium Regulation (Reverb, 3-Stage EQ, Music Accompaniment)
3. Setup
Before operating your TEYUN A4 mixer, ensure all connections are made correctly.
3.1 Power Supply
The mixer offers flexible power options:
- Via Computer USB: Connect the mixer directly to your computer's USB port using the provided USB cable. No external adapter is needed.
- Via Power Adapter: Use the provided power adapter and power cord plug to connect the mixer to a standard AC outlet (100-240V).
- Via Power Bank: For portable use, connect the mixer to a mobile power bank via USB.
Figure 3: USB Power Supply Options
3.2 Connecting Audio Devices
Refer to the connection diagram for various audio device setups:
Figure 4: General Connectivity Diagram
- Microphones: Connect condenser microphones (requiring 48V phantom power) or dynamic microphones to the MIC/LINE input jacks.
- Line-level Devices: Connect instruments like guitars or electronic organs, or other line-level audio sources (e.g., CD players) to the appropriate MIC/LINE or LEFT/RIGHT input jacks.
- Output Devices: Connect power amplifiers and passive speakers to the L MAIN R outputs. Connect headphones to the PHONES output for monitoring.
- Computer: Connect your computer via USB for audio input/output and recording.
Figure 5: Mic/Line Input Types
4. Operating Instructions
4.1 Basic Operation
- Power On: Connect the power supply and turn on the mixer.
- Input Gain: Adjust the GAIN knobs for each channel to achieve optimal input levels without clipping (indicated by the PEAK LED).
- Equalization: Use the HIGH, MID, and LOW knobs to adjust the treble, midrange, and bass frequencies for each channel.
- Effects: Adjust the DELAY and REPEAT knobs to control the reverb effect.
- Main Output: Adjust the MAIN knob to control the overall output volume.
- Headphone Monitoring: Use the PHONES knob to adjust the headphone volume.
4.2 Bluetooth Connectivity
To connect a Bluetooth-compatible device:
- Ensure the mixer is powered on.
- Activate Bluetooth on your mobile device.
- Search for available devices and select the TEYUN A4 mixer.
- Once connected, you can stream audio wirelessly to the mixer.
Figure 6: Bluetooth Connectivity
4.3 USB Playback and Recording (U-Disk)
The mixer supports MP3 and WMA playback from a U-Disk and can also record directly to a U-Disk.
- Playback: Insert a U-Disk containing MP3 or WMA files into the USB port. Use the MP3/USB controls to navigate and play tracks.
- Recording: To record to a U-Disk, ensure a U-Disk is inserted. Follow the mixer's display instructions to initiate recording.
Figure 7: U-Disk Functionality
4.4 Computer Recording
The TEYUN A4 can be used as a sound card for your computer, allowing you to record audio directly to a computer program.
- Connect: Connect the mixer to your computer via a USB cable.
- Software Setup: Open your preferred computer recording program (e.g., GoldWave).
- Input/Output: The mixer will act as an audio input device for your computer. You can play background music from your computer through the mixer and record the mixed audio back to the computer.
- Record: Initiate recording within your computer's audio software.
Figure 8: Recording by Computer
Video 1: TEYUN A4 Mixer Features Overview
5. Specifications
| Parameter | Value |
|---|---|
| Model | A4 |
| Color | Black |
| Material | ABS |
| Dimensions (H x W) | 180mm x 150mm |
| Gross Weight | 0.6 KG |
| Total Harmonic Distortion | ≤0.1% |
| Frequency Response | 20Hz~20KHz/±0.5dB |
| Signal-to-Noise Ratio (S/N) | ≥-80dB |
| Max Outputs | 4V/MAX |
| MIC Input Impedance | 2.4KΩ |
| Mono Input Impedance | 11KΩ |
| Stereo Input Impedance | 100KΩ |
| Parametric EQ (HI) | 12KHz±15dB |
| Parametric EQ (LOW) | 80Hz/±15dB |
| Power Supply Voltage | AC100-240V |
Figure 9: Product Dimensions
6. User Tips
- When using condenser microphones, ensure the 48V phantom power is activated for proper operation.
- Always start with gain knobs at their lowest setting and gradually increase to avoid sudden loud noises or clipping.
- For optimal recording quality, monitor your audio through headphones to catch any unwanted noise or distortion.
- Experiment with the delay and repeat effects to add depth and character to your vocals or instruments.
- Keep the mixer in a well-ventilated area to prevent overheating, especially during long periods of use.
7. Troubleshooting
- No Sound Output:
- Check all cable connections to speakers, headphones, and input devices.
- Ensure all volume knobs (GAIN, MAIN, PHONES) are turned up.
- Verify that the correct input source is selected and active. - Distorted Sound:
- Reduce the GAIN for the input channel or the MAIN volume.
- Check if any PEAK LEDs are consistently lit, indicating clipping.
- Ensure cables are not damaged and are fully inserted. - Microphone Not Working:
- For condenser microphones, ensure 48V phantom power is enabled.
- Check microphone cable connection and ensure the microphone is functional. - Bluetooth Connection Issues:
- Ensure the mixer's Bluetooth is active and discoverable.
- Turn off and on Bluetooth on your mobile device and try reconnecting.
- Ensure no other devices are currently connected to the mixer via Bluetooth. - USB Playback/Recording Failure:
- Ensure the U-Disk is properly formatted and contains compatible audio files (MP3/WMA).
- Check if the U-Disk has sufficient free space for recording.
8. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the mixer. Avoid using liquid cleaners or solvents, as they may damage the finish or internal components.
- Storage: Store the mixer in a cool, dry place away from direct sunlight, extreme temperatures, and high humidity.
- Handling: Handle the mixer with care to prevent physical damage. Avoid dropping or subjecting it to strong impacts.
- Cable Management: Keep cables organized and untangled to prevent damage and ensure reliable connections.
9. Warranty and Support
For any issues not covered in this manual or for technical support, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase for warranty claims.
