Lomeho LO-U11 Wireless Microphone System

1. Introduction

The Lomeho LO-U11 is a versatile 2-way wireless microphone system designed for various applications including DJ performances, parties, karaoke, and church events. It features 2x380 multi-frequency channels, anti-feedback and mute functions, and a robust metal handheld design. This manual provides detailed instructions for setting up, operating, and maintaining your LO-U11 system.

Figure 1: Lomeho LO-U11 Wireless Microphone System

2. Key Features

• Multi-Frequency: 2x380 channels
• Anti-feedback function
• Mute function
• Frequency lock capability
• Battery Power display
• Working range: Over 50 meters (164 ft)
• Power supply: DC 5V or 12V

Figure 2: Highlighted Features

3. Package Contents

Please check that all items are present in the package:

• Receiver: 1 piece
• Handheld transmitter (Microphone): 2 pieces
• Antenna: 2 pieces
• Power adapter: 1 piece
• Power cable: 1 piece
• Audio cable: 1 piece
• Anti-slip ring: 2 pieces
• Manual: 1 piece

Figure 3: Packing List

4. Product Overview

4.1 Receiver

The receiver unit processes the wireless signals from the microphones and outputs the audio. It features controls for frequency selection, volume, and anti-feedback.

Front Panel Controls:

Figure 4: Receiver Front Panel

1. UP/DOWN Button (Left Channel): Press to choose frequency for the left microphone.
2. SET Button (Left Channel): Infrared data transmission launch button for the left microphone.
3. Screen: Displays frequency, channel, and other status information.
4. SET Button (Right Channel): Infrared data transmission launch button for the right microphone.
5. UP/DOWN Button (Right Channel): Press to choose frequency for the right microphone.
6. Volume Knob (Left Channel): Adjusts the volume for the left microphone.
7. IR Signal Indicator: Lights up during infrared synchronization.
8. Volume Knob (Right Channel): Adjusts the volume for the right microphone.
9. Anti-feedback Indicators: Lights up when anti-feedback is active.
10. Power Switch: Turns the receiver ON/OFF.
11. Anti-feedback Button: Activates/deactivates the anti-feedback function.

Screen Indicators:

Figure 5: Receiver Screen Details

1. Audio Frequency signal level (Left Channel)
2. Squelch locked indicator (Left Channel)
3. Frequency indicator (Left Channel)
4. Frequency indicator (Right Channel)
5. Squelch locked indicator (Right Channel)
6. Audio Frequency signal level (Right Channel)
7. Radio Frequency signal level (Left Channel)
8. Antenna A or B indicator (Left Channel)
9. Transmitter power level indicator (Left Channel)
10. Transmitter channel indicator (Left Channel)
11. Transmitter channel indicator (Right Channel)
12. Transmitter power level indicator (Right Channel)
13. Antenna A or B indicator (Right Channel)
14. Radio Frequency signal level (Right Channel)

Back Panel Connectors:

Figure 6: Receiver Back Panel

1. Antenna connector (for Antenna 1)
2. XLR Balanced audio output socket (for Left and Right channels)
3. USB 5V Power supply input
4. DC Power supply input (for 12V adapter, not included)
5. Unbalanced mixing audio output socket (1/4" Jack)
6. Antenna connector (for Antenna 2)

Antennas:

The system includes two detachable antennas for the receiver.

Figure 7: Detachable Antennas

4.2 Handheld Microphones (Transmitters)

The two handheld microphones are dynamic with a cardioid polar pattern, designed for clear vocal pickup. Each microphone features an LCD screen for status display and operates on AA batteries.

Microphone Components:

Figure 8: Microphone Cartridge

Figure 9: Microphone Cartridge Detail

Microphone Screen:

Figure 10: Microphone Screen

1. Frequency display
2. Battery power indicator
3. Channel number
4. Channel of receiver (A microphone or B microphone)

Battery Compartment:

Each microphone requires 2 AA batteries.

Figure 11: Microphone Battery Compartment

Anti-slip Rings:

Two anti-slip rings are provided for the microphones.

Figure 12: Anti-slip Rings

5. Setup Instructions

5.1 Connecting the Receiver

1. Attach Antennas: Screw the two detachable antennas onto the antenna connectors (1 and 6) on the receiver's back panel.
2. Power Supply: Connect the provided power adapter to the USB 5V Power supply input (3) on the receiver's back panel. Alternatively, you can use a power bank with a USB cable for 5V power, or a 12V DC power supply (not included) to the DC Power supply input (4).
   

   Figure 13: Receiver Power Supply Options

   

   Figure 14: Power Bank Connection
3. Audio Output: Connect the receiver to your audio system (mixer, amplifier, etc.) using either the XLR Balanced audio output sockets (2) or the Unbalanced mixing audio output socket (5) with the provided 1/4" audio cable.
   

   Figure 15: Connection Diagram

5.2 Installing Microphone Batteries

1. Unscrew the bottom part of each handheld microphone.
2. Insert 2 AA batteries into each microphone, ensuring correct polarity.
3. Screw the bottom part back on securely.

Figure 16: AA Battery Installation

6. Operation

6.1 Powering On

Turn on the receiver using the Power switch (10) on the front panel. Then, turn on each handheld microphone.

6.2 Multi-Frequency Synchronization (SYNC)

To synchronize the microphones with the receiver:

1. Step 1 (Receiver Frequency Selection):
   a. Press the "UP/DOWN" button (1 or 5) on the receiver to choose the desired frequency for each channel.
   b. Press the "SET" button (2 or 4) to confirm the frequency selection.
2. Step 2 (Microphone Synchronization):
   a. Turn on the microphone.
3. b. Face the microphone's screen towards the IR window on the receiver (approximately 20cm or 8 inches away).
   

   Figure 17: IR Sync Process

   

   Figure 18: IR Window Alignment

   c. Long press the "SET" button on the receiver to initiate synchronization. The IR signal indicator (7) on the receiver will light up during this process.

6.3 Anti-feedback Function

To activate the anti-feedback function:

1. Press the "Anti-feedback" button (11) on the receiver's front panel.
2. The "Squeak" light (part of the Anti-feedback Indicators, 9) will illuminate, indicating the function is active.

Figure 19: Anti-feedback Activation

6.4 Mute Function (Microphone)

To mute a microphone:

1. When the microphone is on, press the switch button on the microphone.
2. The microphone screen will display "AF OFF" and flash.
3. In this "AF OFF" status, the microphone will not pick up sound. Press the switch again to unmute.

Figure 20: Microphone Mute Display

Figure 21: Microphone Mute Button

6.5 Lock Frequency (Receiver)

To lock the receiver's frequency and prevent accidental changes:

1. Long press the "SET" button (2 or 4) on the receiver for 10 seconds.
2. A lock icon will appear on the receiver's screen, indicating the frequency is locked. Repeat the process to unlock.

Figure 22: Frequency Lock Function

6.6 Adjusting Volume

Use the Volume knobs (6 and 8) on the receiver's front panel to adjust the output volume for each microphone channel independently.

6.7 Monitoring Battery Power

The receiver and microphone screens display battery level indicators. Monitor these indicators to ensure sufficient power during operation.

Figure 23: Receiver Battery Display

Figure 24: Microphone Battery Display

6.8 Working Range

The system offers a working range of over 50 meters (164 ft) in optimal conditions. Ensure a clear line of sight between the microphones and the receiver for best performance.

Figure 25: Wireless Working Range

7. Specifications

8. Maintenance

• Cleaning: Use a soft, dry cloth to clean the surfaces of the receiver and microphones. Do not use liquid cleaners or solvents.
• Storage: When not in use for extended periods, remove batteries from the microphones and store the system in a cool, dry place away from direct sunlight and extreme temperatures.
• Battery Replacement: Replace batteries promptly when the low battery indicator appears on the microphone screen to ensure optimal performance.
• Antennas: Handle antennas carefully to avoid bending or breaking.

9. Troubleshooting

• No Sound:
  a. Ensure the receiver is powered on and connected correctly to your audio system.
  b. Check that microphones are powered on and have fresh batteries.
  c. Verify that microphones are synchronized with the receiver (refer to Section 6.2).
  d. Adjust the volume knobs on the receiver.
• Interference/Poor Signal:
  a. Ensure a clear line of sight between microphones and receiver.
  b. Try changing the frequency channel on the receiver and re-syncing the microphones.
  c. Keep the receiver away from other wireless devices or sources of electromagnetic interference.
• Feedback (Squealing Sound):
  a. Activate the anti-feedback function on the receiver (refer to Section 6.3).
  b. Reduce the microphone volume or move the microphone further away from speakers.
• Microphone Not Muting:
  a. Ensure you are pressing the correct switch on the microphone to activate the mute function. The screen should display "AF OFF".

10. User Tips

• Connecting to Computers: The receiver's audio output is a 1/4" (6.3mm) jack. If connecting to a computer's 3.5mm microphone input, you will need a 6.3mm to 3.5mm adapter (not included).
• Battery Removal: The microphone battery compartment is designed to hold batteries tightly to prevent movement. When removing batteries, you may find them slightly difficult to extract.
• Anti-feedback Effectiveness: The anti-feedback suppressor is effective against general feedback. For severe feedback issues, adjust microphone placement and system gain settings in addition to using the anti-feedback feature.

11. Warranty and Support

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