NILUNWEI K4 4-Channel Audio Mixer

1. Product Introduction

The NILUNWEI K4 is a versatile 4-channel audio mixer equipped with a sound card, designed to meet the diverse needs of users involved in home music production, network broadcasting, and karaoke (K-song cover) applications. Its compact and lightweight design allows for direct connection to a PC's USB port for power, eliminating the need for an external power adapter. It can also be powered via a mobile power supply or a standard USB adapter.

2. Product Features

• 4-Channel Mixing: Provides four input channels for various audio sources.
• Built-in Sound Card: Seamless integration with computers for recording and playback.
• 48V Phantom Power: Direct power supply for condenser microphones on channels 1 and 2.
• Multiple Function Modes: Supports LINE input, Bluetooth connectivity, and PC audio.
• MP3 Playback & Recording: Features an integrated MP3 player with display and stereo input recording capability.
• USB Powered: Can be powered directly from a PC's USB port, mobile power bank, or USB adapter.
• Stereo Output: Dedicated stereo output interface for main audio.
• Headphone Monitoring: Includes a headphone socket with independent volume control.
• Tone Control: GAIN, HIGH, and LOW knobs for each channel to adjust input signal gain and treble/bass tones.
• Effects: EFX knob for channel effects access and DELAY/REPEAT knobs for echo adjustments.

3. Controls and Interfaces

Familiarize yourself with the various controls and connection points on your K4 mixer:

1. MIC/LINE Mono Input Socket (1-2): Connects XLR plugs and 1/4-inch phone plugs for condenser microphones or instruments.
2. MIC/LINE Mono Input Socket (3-4): Connects XLR plugs and 1/4-inch phone plugs for condenser microphones or instruments.
3. Stereo Input Jack (LEFT/RIGHT): Used to connect mono or stereo instruments such as electronic keyboards and other audio devices.
4. REC (Recording) Input/Output: RCA ports for stereo recording input and output.
5. MAIN Output (LEFT/RIGHT): Main stereo output interface.
6. +48V Phantom Power Switch: Activates +48V phantom power for condenser microphones connected to channels 1 and 2.
7. GAIN Knobs: Adjusts the input signal gain for each channel.
8. HIGH Knobs: Controls the treble tone for each channel.
9. LOW Knobs: Controls the bass tone for each channel.
10. EFX Knobs: Provides access to channel effects.
11. Channel Volume Knobs (LEVEL 1, LEVEL 2, LEVEL 3-4): Adjusts the signal level for each channel.
12. PHONES Knob: Adjusts the headphone monitoring volume.
13. MAIN Knob: Controls the stereo main output volume. Adjust to achieve the desired main output level.
14. MP3 Master Key:
    • Short press: Play/Pause/Display.
    • Long press: Converts to recording state and records the channel signal.
    • Previous/Volume Down: Short press for previous song, long press to decrease volume.
    • Next/Volume Up: Short press for next song, long press to increase volume.
15. MODE/BT Button: Short press to change the working state between LINE, Bluetooth (BT), and PC. Long press to change the playback mode.
16. MP3 Display: Shows MP3 operation control and playback status.
17. USB Audio (CH3/4 STEREO(PRE)): Indicates USB audio input for channels 3/4.
18. USB Port (MP3/PC): Used for computer direct power supply and music transmission.
19. Headphone Socket: Connects headphones for monitoring.
20. Power Supply Display Lamp: Indicates power status.
21. Signal Output Status Display: Shows the status of the output signal.

4. Setup

4.1 Power Connection

1. Connect the mixer to a power source using the provided USB cable.
2. You can use a PC's USB port, a mobile power bank, or a standard USB adapter (5V/1A recommended).
3. The Power Supply Display Lamp (16) will illuminate when power is connected.

4.2 Input Connections

• Microphones/Instruments: Connect microphones (XLR or 1/4-inch phone plug) or instruments (1/4-inch phone plug) to the MIC/LINE Mono Input Sockets (1, 2, 3, 4).
• Condenser Microphones: If using condenser microphones, ensure the +48V Phantom Power Switch (6) is engaged for channels 1 and 2.
• Stereo Instruments: Connect stereo instruments to the Stereo Input Jacks (3).
• External Recording Devices: Use the REC Input/Output (4) for connecting external recording devices.

4.3 Output Connections

• Main Output: Connect your main speakers or amplifier to the MAIN Output (5) using appropriate cables.
• Headphones: Connect your headphones to the Headphone Socket (19) for monitoring.

5. Operating Instructions

5.1 Basic Audio Mixing

1. Power On: Ensure the mixer is powered on.
2. Input Gain: Adjust the GAIN Knobs (7) for each active channel to achieve a healthy input signal without clipping (monitor the Signal Output Status Display (17)).
3. Tone Adjustment: Use the HIGH (8) and LOW (9) Knobs to shape the treble and bass frequencies of each channel.
4. Channel Volume: Adjust the Channel Volume Knobs (11) to set the individual levels of each input in the mix.
5. Main Output Volume: Use the MAIN Knob (13) to control the overall output volume of the mixer.
6. Headphone Monitoring: Adjust the PHONES Knob (12) to set your desired headphone monitoring level.

5.2 MP3 Playback and Recording

1. MP3 Playback: Insert a USB drive with MP3 files into the USB Port (18). The MP3 Display (16) will show playback status. Use the MP3 Master Key (14) for play/pause, previous/next track, and volume control.
2. Recording: Long press the MP3 Master Key (14) to enter recording mode. The mixer will record the main output signal to the connected USB drive.

5.3 Bluetooth Connection

1. Press the MODE/BT Button (15) until 'BT' is displayed on the MP3 Display (16).
2. On your mobile device, search for Bluetooth devices and select 'K4' (or similar name) to pair.
3. Once connected, audio from your mobile device will play through the mixer.

5.4 PC Connection (USB Audio Interface)

1. Connect the mixer to your PC using the USB cable via the USB Port (18).
2. The mixer will be recognized as a USB audio device.
3. You can use the mixer for audio input (recording) and output (playback) with your computer's audio software.
4. Press the MODE/BT Button (15) until 'PC' is displayed on the MP3 Display (16) to ensure PC mode is active.

5.5 Effects Control

• Channel Effects: Use the EFX Knobs (10) to apply effects to individual channels.
• Echo/Delay: Adjust the REPEAT Knob (13) to control the echo repetition frequency and the DELAY Knob (14) to set the echo repetition interval.

6. Maintenance

• Cleaning: Use a soft, dry cloth to clean the mixer's surface. Avoid using liquid cleaners or solvents.
• Storage: Store the mixer in a cool, dry place away from direct sunlight and extreme temperatures.
• Handling: Avoid dropping or subjecting the mixer to strong impacts.
• Cable Management: Ensure cables are not kinked or strained to prevent damage to connectors and ports.

7. Troubleshooting

8. Specifications

9. User Tips

• Power Source: While the mixer is USB powered, ensure your USB power source (PC port, power bank, or adapter) can provide sufficient current for stable operation, especially when using phantom power.
• Microphone Compatibility: Always check if your microphone requires +48V phantom power before connecting and activating the switch. Dynamic microphones typically do not require it.
• Recording Quality: For optimal recording quality, ensure input gains are set correctly to avoid clipping, and use high-quality cables.

10. Warranty and Support

For warranty information and technical support, please refer to the documentation provided at the time of purchase or contact your retailer. Keep your proof of purchase for any warranty claims.