1. Introduction
The Lomeho LO-U11 is a professional dual-channel wireless microphone system designed for high-quality audio capture in various settings such as karaoke, stage performances, church events, and shows. This system features adjustable UHF frequencies, anti-feedback capabilities, mute functions, and a robust working range of over 50 meters (164 ft). This manual provides detailed instructions for setting up, operating, and maintaining your wireless microphone system to ensure optimal performance.
2. Package Contents
Please check the box for the following items:
- Receiver (1 piece)
- Handheld Transmitter (Microphone) (2 pieces)
- Antenna (2 pieces)
- Power Adapter (1 piece)
- Power Cable (1 piece)
- 6.3 Audio Cable (1 piece)
- Anti-slip Ring (2 pieces)
- User Manual (1 piece)
3. Product Overview
3.1 Receiver
The receiver unit is the central hub for your wireless microphone system, processing audio signals from the microphones.
Front Panel Controls
- UP/Down Button (Channel 1): Press to select frequency for Channel 1.
- SET Button (Channel 1): Used for infrared data transmission and confirming frequency selection for Channel 1.
- Screen: Displays system information such as frequency, channel, and signal levels.
- SET Button (Channel 2): Used for infrared data transmission and confirming frequency selection for Channel 2.
- UP/Down Button (Channel 2): Press to select frequency for Channel 2.
- Volume Knob (Channel 1): Adjusts the output volume for Channel 1.
- IR Signal Indicator: Lights up when infrared signal is detected during synchronization.
- Volume Knob (Channel 2): Adjusts the output volume for Channel 2.
- Anti-feedback Indicator: Lights up when the anti-feedback function is active.
- Power Switch: Turns the receiver ON/OFF.
- Anti-feedback Button: Activates/deactivates the anti-feedback function.
Receiver Screen Indicators
- Radio Frequency (RF) Signal Level (Channel 1)
- Squelch Locked Indicator (Channel 1)
- Frequency Indicator (Channel 1)
- Frequency Indicator (Channel 2)
- Squelch Locked Indicator (Channel 2)
- Radio Frequency (RF) Signal Level (Channel 2)
- Audio Frequency (AF) Signal Level (Channel 1)
- Antenna A or B Indicator (Channel 1)
- Transmitter Power Level Indicator (Channel 1)
- Transmitter Channel Indicator (Channel 1)
- Transmitter Channel Indicator (Channel 2)
- Transmitter Power Level Indicator (Channel 2)
- Antenna A or B Indicator (Channel 2)
- Audio Frequency (AF) Signal Level (Channel 2)
Back Panel Connections
- Antenna Connector (ANT-2): Connects to Antenna 2.
- XLR Balanced Audio Output Sockets (BALANCED-1, BALANCED-2): Provides balanced audio output for each channel.
- USB 5V Power Supply: For connecting a 5V USB power source (e.g., power bank).
- DC Power Supply: For connecting a 12V DC power adapter (not included).
- Unbalanced Mixing Audio Output Socket (MIX OUT): Provides a combined unbalanced audio output for both channels.
- Antenna Connector (ANT-1): Connects to Antenna 1.
3.2 Handheld Transmitter (Microphone)
The system includes two dynamic handheld microphones with a cardioid polar pattern.
Microphone Screen Indicators
- Frequency: Displays the current operating frequency.
- Battery Power Indicator: Shows the remaining battery life.
- Channel Number: Indicates the current channel (e.g., CH 001).
- Receiver Channel: Indicates which receiver channel the microphone is paired with (e.g., G1 or G2).
Battery Compartment
Each microphone requires two AA (KR6 1.5V) batteries. The battery compartment is designed to be tight to prevent movement during use. This may make battery removal slightly challenging.
Anti-slip Rings
Two anti-slip rings are included to provide a secure grip and prevent the microphones from rolling on flat surfaces.
4. Setup Instructions
4.1 Power Supply
The receiver can be powered by either a 5V USB source or a 12V DC source.
- 5V USB Power Supply: Connect the included power cable to the USB 5V port on the receiver's back panel and to a 5V USB power adapter (included) or a power bank (not included).
- 12V DC Power Supply: Connect a 12V DC power adapter (not included) to the DC Power port on the receiver's back panel.
4.2 Antenna Installation
Screw the two detachable antennas onto the ANT-1 and ANT-2 connectors on the receiver's back panel. Ensure they are securely fastened and positioned for optimal signal reception.
4.3 Connecting to an Audio System
Connect the receiver to your audio mixer, amplifier, or powered speaker using either the XLR balanced audio outputs or the 1/4" unbalanced mix out.
- XLR Balanced Output: Use XLR cables to connect the BALANCED-1 and BALANCED-2 outputs to corresponding inputs on your audio mixer for individual channel control.
- 1/4" Unbalanced Mix Out: Use the included 6.3 audio cable to connect the MIX OUT to a single input on your audio mixer, amplifier, or powered speaker for a combined stereo signal.
4.4 Frequency Synchronization (SYNC)
To ensure the microphones communicate with the receiver, you need to synchronize their frequencies.
- Step 1 (Receiver Frequency Selection):
- Press the "UP/DOWN" buttons on the receiver's front panel to select your desired frequency for each channel.
- Press the "SET" button for each channel to confirm the selected frequency.
- Step 2 (Microphone Synchronization):
- Turn on the handheld microphone.
- Position the microphone's screen approximately 20 cm (8 inches) away from the IR window on the receiver's front panel.
- Long press the "SET" button on the receiver for the corresponding channel. The IR signal indicator (7) will light up, and the microphone's frequency will synchronize with the receiver.
5. Operating Instructions
5.1 Anti-feedback Function
To reduce audio feedback (squealing sound):
- Press the "Anti-feedback" button (11) on the receiver's front panel.
- The "Squeak" indicator light (9) will illuminate, indicating the function is active.
5.2 Mute Function (Microphone)
To temporarily mute a handheld microphone:
- While the microphone is ON, press the power switch on the microphone.
- The microphone screen will display "AFF OFF" and flash.
- In this "AF OFF" status, the microphone will not pick up sound. Press the switch again to unmute.
5.3 Lock Frequency (Receiver)
To prevent accidental frequency changes on the receiver:
- Long press the "SET" button on the receiver for approximately 10 seconds.
- A lock icon will appear on the receiver's screen, indicating that the frequency is locked. Repeat the process to unlock.
5.4 Volume Control
Adjust the output volume for each microphone channel using the corresponding Volume Knobs (6 and 8) on the receiver's front panel.
5.5 Working Range
The system has an effective working range of over 50 meters (164 ft) in open areas with clear line of sight between the microphones and the receiver.
6. Maintenance
6.1 Cleaning
- Wipe the receiver and microphones with a soft, dry cloth.
- Do not use liquid cleaners or solvents, as they may damage the finish or internal components.
- For microphone grilles, gently remove any debris using a soft brush.
6.2 Battery Replacement
- Replace microphone batteries when the battery power indicator on the microphone screen shows low power.
- Use two fresh AA (KR6 1.5V) batteries for each microphone.
- Ensure correct polarity when inserting batteries.
6.3 Storage
- When not in use for extended periods, remove batteries from the microphones to prevent leakage.
- Store the system in a cool, dry place away from direct sunlight and extreme temperatures.
- Keep components in their original packaging or a protective case to prevent damage.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from microphone | Microphone or receiver not powered on Microphone muted Low microphone battery Incorrect frequency synchronization Audio cable disconnected Receiver volume too low | Ensure both microphone and receiver are ON Check microphone screen for "AF OFF" and unmute Replace AA batteries in microphone Perform frequency synchronization (Section 4.4) Check all audio cable connections Increase receiver volume |
| Audio feedback (squealing) | Anti-feedback function OFF Microphone too close to speakers Volume too high | Activate anti-feedback function (Section 5.1) Increase distance between microphone and speakers Reduce receiver volume |
| Poor signal or dropouts | Low microphone battery Antennas not connected or obstructed Operating beyond range Interference from other devices | Replace AA batteries in microphone Ensure antennas are securely connected and unobstructed Operate within 50m (164 ft) line of sight Change frequency if possible (Section 4.4) |
| Receiver screen locked | Frequency lock activated | Long press "SET" button for 10 seconds to unlock (Section 5.3) |
7.1 Microphone Battery Display
The receiver screen also displays the battery level of the connected microphones, allowing you to monitor their power status.
8. Specifications
| Feature | Specification |
|---|---|
| Brand Name | LOMEHO |
| Model | LO-U11 |
| Set Type | Transmitter Sets |
| Transducer | Dynamic Microphone |
| Use | Karaoke Microphone |
| Style | Handheld Microphone |
| Polar Patterns | Cardioid |
| Communication | Wireless |
| Frequency Channels | 2 * 450 channels CHA: 500.00-544.90MHz CHB: 550.00-594.90MHz |
| Working Range | Over 50m (164 ft) |
| Microphone Battery | AA KR6 1.5V (2 pcs per microphone) |
| Receiver Power Supply | DC 5V (USB) or 12V |
| Functions | Mute, Anti-feedback, Lock Frequency |
| Digital Modulation | pi/4DQPSK |
| Occupied Bandwidth | 100k |
| Signal-to-Noise Ratio (S/N) | 90dB |
| Frequency Response | 50-15KHz |
| Transmitting Power | <10dBm |
| Frequency Stabilization | +/-0.005% |
| Channel | Dual channel / 2 channel |
| Occasion | Church, performance, show, stage |
| Diaphragm | S-Mall |
| Built-in Battery | No |
9. User Tips
- Microphone Material: The handheld microphones are constructed from metal, providing a durable and professional feel.
- Battery Removal: The microphone battery compartment is designed for a tight fit to prevent rattling. When removing batteries, you may need to apply a firm but gentle force.
- Optimal Performance: For best wireless performance, ensure a clear line of sight between the microphones and the receiver, and avoid placing the receiver near other electronic devices that might cause interference.
10. Warranty and Support
For any technical issues, questions, or support needs regarding your Lomeho LO-U11 Wireless Microphone System, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase for warranty claims.
