1. Introduction
This manual provides detailed instructions for the setup, operation, and maintenance of your Lomeho LO-U11 Dual Channel Wireless Microphone System. Please read this manual carefully before use to ensure optimal performance and longevity of your device.
Note on Power Adapters: For Australia, an AU plug will be provided. For EU countries, an EU plug will be provided.
2. Package Contents
Verify that all items listed below are included in your package:
Figure 1: Package Contents
- 1 x Receiver
- 2 x Handheld Transmitters (Microphones)
- 2 x Antennas
- 1 x Power Adapter
- 1 x Power Cable
- 1 x 6.3 Audio Cable
- 2 x Anti-slip Rings
- 1 x User Manual
3. Product Overview
3.1 Receiver General View
Figure 2: Receiver Front and Rear View
3.2 Receiver Front Panel Controls
Figure 3: Receiver Front Panel
- UP/DOWN Buttons (Channel A): Used to select frequency for Channel A.
- SET Button (Channel A): Infrared data transmission launch button for Channel A. Long press to confirm selection or lock frequency.
- LCD Display: Shows frequency, channel number, battery level, AF/RF signal, and squelch status.
- UP/DOWN Buttons (Channel B): Used to select frequency for Channel B.
- SET Button (Channel B): Infrared data transmission launch button for Channel B. Long press to confirm selection or lock frequency.
- Volume Knob (Channel A): Adjusts output volume for Channel A.
- IR Signal Indicator: Flashes red during frequency syncing, solid when synced.
- Volume Knob (Channel B): Adjusts output volume for Channel B.
- Anti-feedback Indicators: Two levels of indication for anti-feedback function.
- Anti-feedback Button: Activates/deactivates the anti-feedback function.
- Power Switch: Turns the receiver ON/OFF.
3.3 Receiver Rear Panel Connections
Figure 4: Receiver Rear Panel Connections
- Antenna 2 Connector: Connects Antenna B.
- XLR Balanced Audio Output Socket 2: Balanced audio output for Channel B.
- XLR Balanced Audio Output Socket 1: Balanced audio output for Channel A.
- USB 5V Input Power Supply: For 5V DC power input.
- DC Input Socket: For 12V DC power input.
- Unbalanced Mixing Audio Output Socket: Combined unbalanced audio output for both channels (6.3mm jack).
- Antenna 1 Connector: Connects Antenna A.
3.4 Handheld Microphone (Transmitter)
Figure 5: Handheld Microphone Overview
- Microphone Grill: Protects the microphone capsule.
- IR Transmitter Window: Used for infrared frequency synchronization with the receiver.
- LCD Screen: Displays frequency, battery level, and channel number.
- Power Switch/Silent Switch: Turns the microphone ON/OFF and activates mute function.
- Body: Main casing of the microphone.
- Battery Holder: Compartment for AA batteries.
- Battery Cover: Secures the battery compartment.
Figure 6: Microphone LCD Display Details
- Frequency (MHz)
- Battery Power Indicator
- Channel Number
- Receiver Channel Indicator (G1 for Channel A, G2 for Channel B)
3.5 Receiver LCD Display Details
Figure 7: Receiver LCD Display Details
- Audio Frequency (AF) Signal Level (Channel A)
- Squelch Locked Indicator (Channel A)
- Frequency Indicator (Channel A)
- Frequency Indicator (Channel B)
- Squelch Locked Indicator (Channel B)
- Audio Frequency (AF) Signal Level (Channel B)
- Radio Frequency (RF) Signal Level (Channel A)
- Antenna A Indicator
- Transmitter Power Level Indicator (Channel A)
- Transmitter Channel Indicator (Channel A)
- Transmitter Channel Indicator (Channel B)
- Transmitter Power Level Indicator (Channel B)
- Antenna B Indicator
- Radio Frequency (RF) Signal Level (Channel B)
4. Setup Guide
4.1 Antenna Installation
Screw the two detachable antennas onto the ANT-1 and ANT-2 connectors on the rear panel of the receiver. Ensure they are securely fastened and positioned upright for optimal signal reception.
Figure 8: Antenna Installation
4.2 Power Supply
The receiver can be powered by either a 5V USB power supply or a 12V DC power supply.
Figure 9: Receiver Power Input Options
- **5V DC Power Supply:** Connect the provided power cable to the USB 5V input port on the receiver and to a compatible 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 input socket on the receiver.
Figure 10: Power Connection Examples
4.3 Microphone Battery Installation
Each handheld microphone requires two 1.5V AA batteries.
- Unscrew the bottom part of the microphone to reveal the battery compartment.
- Insert two AA batteries, ensuring correct polarity (+/-).
- Screw the bottom part back on securely.
Note: The battery compartment is designed to be tight to prevent shaking. It may require a slight effort to insert or remove batteries.
Figure 11: Microphone Battery Installation
4.4 Connecting to Audio Equipment
Connect the receiver to your audio mixer, amplifier, or other sound equipment using the appropriate audio cables.
Figure 12: Audio Connection Diagram
- **Balanced Output (XLR):** Use XLR cables to connect the "BALANCED-1" and "BALANCED-2" outputs on the receiver to the corresponding XLR inputs on your audio mixer or amplifier.
- **Unbalanced Output (MIX OUT):** Use the provided 6.3 audio cable to connect the "MIX OUT" jack on the receiver to a 1/4" input on your audio mixer, amplifier, or other device.
5. Operating Instructions
5.1 Power On/Off
- **Receiver:** Press the "POWER" switch on the front panel to turn the receiver ON or OFF.
- **Microphone:** Press the "Power Switch/Silent Switch" button on the handheld microphone to turn it ON or OFF.
5.2 Frequency Synchronization (SYNC)
The system is pre-paired from the factory. If re-pairing is needed due to interference or new setup, follow these steps:
- On the receiver, use the UP/DOWN buttons for the desired channel (A or B) to select a frequency.
- Press the "SET" button for that channel to confirm your choice.
- Turn on the handheld microphone.
- Align the microphone's IR transmitter window with the receiver's IR signal light (approximately 10 cm / 8 inches apart).
- Press the "SET" button on the receiver again. The receiver's RF signal light will flash, indicating active syncing. Once the RF light stops flashing and the IR light is on, and the frequencies match, synchronization is successful.
Important Note:
- If synchronization fails, repeat the steps.
- When syncing multiple systems, ensure only one transmitter's IR port is exposed to the receiver at a time to prevent accidental pairing of multiple microphones to the same frequency, which can reduce the effective operating distance.
Figure 13: Infrared Frequency Synchronization
5.3 Anti-Feedback Function
To activate the anti-feedback function, press the "Anti-feedback" button on the receiver's front panel. The "Squeak" light will illuminate, indicating the function is active.
Figure 14: Activating Anti-Feedback
5.4 Mute Function (Microphone)
While the microphone is ON, briefly press the "Power Switch/Silent Switch" button on the microphone to mute it. The microphone's screen will display "AF OFF" and flash, indicating that it will not pick up sound.
Figure 15: Microphone Mute Function
5.5 Locking Frequency
To prevent accidental frequency changes, you can lock the receiver's frequency. Long press the "SET" button on the receiver for approximately 10 seconds. A lock icon will appear on the display, indicating the frequency is locked.
Figure 16: Locking Receiver Frequency
5.6 Volume Adjustment
Adjust the output volume for each microphone channel using the corresponding "VOLUME" knobs on the receiver's front panel.
5.7 Working Range
The system offers a working range of over 50 meters (164 feet) under optimal conditions. Ensure a clear line of sight between the microphones and the receiver for best performance.
Figure 17: Wireless Working Range
6. Maintenance
- **Cleaning:** Use a soft, dry cloth to clean the exterior of the receiver and microphones. Do not use liquid cleaners or solvents.
- **Battery Care:** Remove batteries from microphones if they will not be used for an extended period to prevent leakage.
- **Storage:** Store the system in a cool, dry place away from direct sunlight and extreme temperatures.
- **Antennas:** Handle antennas carefully to avoid bending or breaking.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from microphone |
|
|
| Interference or poor sound quality |
|
|
| Receiver display shows "Squelch locked" | Frequency is locked. | Long press the "SET" button for 10 seconds to unlock the frequency. |
8. Specifications
| Feature | Detail |
|---|---|
| Brand | LOMEHO |
| Model | LO-U11 |
| Frequency Range | UHF 500-600MHz / 600-680MHz / 850-950MHz (Adjustable) |
| Frequency Channels | 2 x 450 channels (Total 900 selectable frequencies) |
| Digital Modulation Mode | pi/4DQPSK |
| Occupied Bandwidth | 300KHz |
| Transmission Rate | 204.8Ksps |
| Signal-to-Noise Ratio (S/N) | 90dB |
| Frequency Response | 50-15KHz |
| Transmit Mode | Audio and data using encrypted digital transmission |
| Microphone Capsule | Dynamic |
| Polar Pattern | Cardioid |
| Transmitting Power | ≤10dBm |
| Frequency Stabilization | ±0.005% |
| Microphone Battery | 2 x 1.5V AA batteries |
| Receiver Power Supply | DC 5V (USB) or DC 12V |
| Working Range | >50M (164 ft) |
| Key Features | Multi-level anti-howling, 8 sound effect outputs, multi-system audio connection, ID digital code encryption, up to 64 transmitters simultaneously, DIGITAL PLL technology, low battery alarm, built-in equalizer, effect reverb. |
| Receiver Dimensions (L x W x H) | 21 x 14 x 4.5 cm (8.3 x 5.5 x 1.8 in) |
| Package Dimensions (L x W x H) | 31 x 20 x 10 cm (12.2 x 4.9 x 3.9 in) |
| Package Weight | 1.7 kg |
Figure 18: Product Dimensions
9. User Tips
- For best sound quality, ensure microphones are held at an appropriate distance from the mouth.
- Always check battery levels on both the microphones and receiver before use to avoid interruptions.
- Experiment with different frequencies if you experience any interference in your environment.
- Utilize the anti-feedback function in live performance settings to minimize howling.
- When connecting to a mixer, start with low volume levels and gradually increase to prevent sudden loud noises.
- Attach the anti-slip rings to the microphones to prevent them from rolling off surfaces and to provide extra grip.
10. Frequently Asked Questions (FAQ)
- Q: Can I use more than two microphones with one receiver?
- A: No, this system is designed for two channels (two microphones) per receiver. However, multiple LO-U11 systems can operate simultaneously, supporting up to 64 transmitters in total without interference due to ID digital code encryption.
- Q: What should I do if I experience signal dropouts?
- A: Check the microphone batteries, ensure antennas are properly connected and positioned, and verify there are no major obstructions between the microphones and the receiver. Try changing the operating frequency if interference is suspected.
- Q: Is the system compatible with all audio mixers?
- A: Yes, the receiver provides both balanced XLR outputs and an unbalanced 6.3mm MIX OUT jack, making it compatible with most standard audio mixers and amplifiers.
11. Warranty and Support
For warranty information, technical support, or service inquiries, please contact the seller or refer to the official product page where you made your purchase. Keep your purchase receipt as proof of purchase.
An electronic version of this user manual is available for download. You can find the PDF document at: Lomeho LO-U11 User Manual (PDF).
