AOIEUUAI 4-Channel Audio Mixer User Manual

1. Introduction

Thank you for choosing the AOIEUUAI 4-Channel Audio Mixer. This compact and versatile mixing console is designed for a wide range of audio applications, including small concerts, family KTV, network broadcasting, and studio recording. It features 4 input channels, built-in 48V phantom power, a high-impedance guitar amplifier input, Bluetooth connectivity, MP3 player functionality via USB, and integrated digital effects.

This manual provides detailed instructions for setting up, operating, and maintaining your audio mixer. Please read it thoroughly before use to ensure proper functionality and to maximize your experience.

2. Important Safety Instructions

• Read these instructions carefully before operating the device.
• Keep this manual for future reference.
• Heed all warnings on the product and in the operating instructions.
• Follow all instructions.
• Do not use this apparatus near water.
• Clean only with a dry cloth.
• Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
• Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
• Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
• Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
• Only use attachments/accessories specified by the manufacturer.
• Unplug this apparatus during lightning storms or when unused for long periods of time.
• Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

3. Product Overview

The AOIEUUAI 4-Channel Audio Mixer is designed for intuitive control and high-quality audio processing. Below is a detailed diagram of its various controls and connections.

Control Panel Functions:

1. Mono Input Socket (CH1/CH2): For connecting microphones or line-level instruments.
2. Stereo Input Jack (CH3/4 LINE IN): For connecting stereo line-level devices.
3. Phantom Power Switch (+48V): Activates 48V phantom power for condenser microphones on CH1.
4. MIC/Line Input (CH1/CH2): XLR/TRS combo jacks for microphone or line-level inputs.
5. Effect Send Button (FX): Engages the built-in effects processor for the respective channel.
6. [GAIN] Knobs: Adjusts the input sensitivity for each channel (up to +60dB).
7. [HIGH] Knob: Treble equalizer for input signal (+/-15dB).
8. [LOW] Knob: Bass equalizer for input signal (+/-15dB).
9. Channel Volume Knob (Fader): Adjusts the output level for individual channels (CH1, CH2, CH3/4 USB LEVEL).
10. Main Output Volume Knob (MAIN): Controls the overall output level of the mixer.
11. [REPEAT] Knob: Adjusts the repetition frequency of the selected effect.
12. [DELAY] Knob: Adjusts the delay time of the selected effect.
13. 3.5mm Headset Output Interrupt: Headphone jack for monitoring.
14. Power Supply Display Lamp: Indicates power status.
15. MP3 Master Key (MODE): Cycles through USB, MP3, Bluetooth, and USB Recording modes.
16. MP3 USB Port: For connecting USB flash drives for MP3 playback or recording.
17. MP3 Display: Digital screen showing mode, track number, and time.
18. 6.35mm Output (MAIN OUT): TRS outputs for main stereo mix.
19. MAIN Out (XLR): Balanced XLR outputs for main stereo mix.
20. REC OUT (RCA): RCA outputs for recording the main mix.

4. Setup Instructions

4.1 Power Connection

The mixer can be powered via a computer, mobile power bank, or a standard DC5V/1.5A adapter.

• Connect the provided USB power cable to the "POWER/PC DC5V/1.5A" port on the mixer.
• Connect the other end of the USB cable to a suitable power source (e.g., computer USB port, USB wall adapter, or power bank).
• The Power Supply Display Lamp (14) will illuminate when power is supplied.

4.2 Connecting Input Devices

• Microphones (CH1/CH2): Connect dynamic or condenser microphones to the MIC/Line Input (4) using XLR or 1/4" TRS cables. If using a condenser microphone, ensure the +48V Phantom Power Switch (3) is engaged.
• Line-Level Instruments (CH1/CH2): Connect instruments like keyboards or guitars (with appropriate pre-amps/DI boxes) to the MIC/Line Input (4). For high-impedance guitars, use a dedicated high-impedance input if available or an external DI box.
• Stereo Line-Level Devices (CH3/4 LINE IN): Connect devices such as CD players, media players, or other stereo audio sources to the Stereo Input Jack (2) using RCA cables.
• USB Audio: Connect the mixer to a computer via the USB Audio port for digital audio input/output.

4.3 Connecting Output Devices

• Main Output: Connect your main speakers or amplifier to the MAIN Out (XLR) (19) or 6.35mm Output (18) using appropriate cables.
• Recording Output: Connect a recording device to the REC OUT (RCA) (20) using RCA cables.
• Headphones: Connect headphones to the 3.5mm Headset Output Interrupt (13) for monitoring.

5. Operating Instructions

5.1 Basic Mixing

1. Power On: Ensure all connections are secure, then power on the mixer.
2. Adjust Gain: For each active input channel, slowly increase the [GAIN] Knob (6) until the SIG indicator lights up consistently, and the CLIP indicator flashes only occasionally during the loudest parts of the signal. Avoid constant clipping.
3. Adjust EQ: Use the [HIGH] Knob (7) and [LOW] Knob (8) to shape the tone of each channel.
4. Set Channel Levels: Use the Channel Volume Knobs (9) to balance the individual levels of each input.
5. Set Main Output: Adjust the Main Output Volume Knob (10) to control the overall volume sent to your main speakers.

5.2 Using Phantom Power

If you are using a condenser microphone, activate the +48V Phantom Power Switch (3) for the corresponding channel. Ensure the microphone is connected before engaging phantom power to prevent potential damage.

5.3 MP3 Player / USB Recording

• USB Playback: Insert a USB flash drive containing MP3 files into the MP3 USB Port (16). Use the MP3 Master Key (15) to select "USB" mode. The MP3 Display (17) will show track information. Use the playback controls (play/pause, skip) to navigate.
• USB Recording: Select "USB REC" mode using the MP3 Master Key (15). The mixer will record the main mix directly to the connected USB flash drive.

5.4 Bluetooth Connectivity

• Pairing: Use the MP3 Master Key (15) to select "BT" (Bluetooth) mode. The MP3 Display (17) will indicate Bluetooth pairing mode.
• On your mobile device, search for available Bluetooth devices and select the mixer (usually named "BT-MIXER" or similar).
• Once paired, you can stream audio from your device to the mixer.

5.5 Digital Effects

The mixer features a built-in digital effects processor with 99 different effect adjustments.

• Engage the Effect Send Button (5) on the desired channel to send its signal to the effects processor.
• Use the [DELAY] Knob (12) and [REPEAT] Knob (11) to adjust the parameters of the selected effect.
• The specific effect type can often be selected via a dedicated knob or button in the effects section (not explicitly labeled in the diagram, but implied by "99 different effect adjustments"). Refer to the digital display for effect selection if available.

6. Maintenance

6.1 Cleaning

• Always disconnect the power before cleaning.
• Use a soft, dry cloth to wipe the exterior of the mixer.
• Do not use liquid cleaners, abrasive cleaners, or waxes, as they may damage the finish.
• Use a soft brush or compressed air to clean dust from knobs, faders, and connectors.

6.2 Storage

• When not in use for extended periods, store the mixer in a cool, dry place, away from direct sunlight and extreme temperatures.
• Protect the mixer from dust and moisture.

7. Troubleshooting

8. Specifications

9. User Tips

• Start with Low Volumes: Always begin with all volume knobs (channel and main) set to their minimum position before powering on, then gradually increase to prevent sudden loud noises.
• Monitor Headphone Output: Use the headphone output (13) to monitor your mix closely without affecting the main output.
• Experiment with Effects: The mixer offers a wide range of digital effects. Take time to experiment with the [DELAY] (12) and [REPEAT] (11) knobs to find the perfect sound for your performance or recording.
• USB Power Source: For stable performance, especially during recording or live use, ensure your USB power source provides sufficient and consistent power (DC5V/1.5A). A dedicated wall adapter is often more reliable than a computer USB port.

10. Warranty and Support

This product is covered by a standard manufacturer's warranty. For specific warranty details, please refer to the documentation provided at the time of purchase or contact your retailer.

For technical support, troubleshooting assistance, or inquiries regarding replacement parts, please contact the seller or manufacturer directly through their official support channels.