SENXIN SX31 Wireless Lapel Microphone Instruction Manual

1. Introduction

The SENXIN SX31 is a versatile wireless lapel microphone system designed for high-definition audio recording. It offers seamless connectivity, noise reduction, and reverb effects, making it ideal for various applications including broadcast video, live streaming, conferences, and content creation on platforms like YouTube, Facebook Live, Vlog, Tik Tok, and Twitch.

2. Package Contents

The package typically includes:

• Wireless Microphone Transmitter(s) (TX)
• Receiver (with Apple/Type-C interface)
• Charging Cable (USB)
• User Manual

3. Product Overview

Familiarize yourself with the components and controls of your SENXIN SX31 wireless microphone system.

Figure 1: Transmitter and Receiver Controls
This diagram illustrates the components and controls of the SENXIN SX31 wireless microphone system. The transmitter (TX) features a microphone input, charging port, power/boot button, volume up/down controls, and indicators for charge, connection, headphone output, reverb, noise reduction mode, and original sound mode. The receiver includes a 3.5mm audio output, Apple interface, Type-C interface, and an indicator light.

Figure 2: Microphone Internal Structure
An exploded view of the microphone head, showing the noise filter system (to restore original sound), metal dust filter (to block dust), and sound conduction diaphragm for clear recording.

4. Setup Guide

4.1. Charging

Ensure both the transmitter(s) and receiver are fully charged before first use. Use the provided USB charging cable. The charge indicator on the transmitter will show charging status.

4.2. Connecting the Receiver

1. Plug the receiver directly into your mobile phone or camera's compatible port (Apple Lightning or Type-C). The indicator light on the receiver will illuminate.
2. For Android devices, ensure the OTG (On-The-Go) switch is enabled in your phone's system settings. You can use a 'USB OTG Checker' app to verify compatibility and enable the function if needed. Samsung mobile phones may require recording through a third-party APP camera instead of the original camera app.
3. Note: The 3.5mm audio interface compatibility is not 100% guaranteed due to varying pin definitions. If you encounter issues, try using the Type-C or Apple interfaces if available on your device.

4.3. Powering On and Automatic Pairing

1. Press and hold the power/boot button on the transmitter(s) to turn them on. The system features quick auto-pairing for a seamless connection. The 'connect' indicator on the transmitter will show connection status.
2. The microphone system is designed for quick auto-pairing, establishing a seamless wireless connection between the transmitter and receiver upon power-on. It features a built-in optimized antenna design, operating at 570-618MHz for stable signal transmission.

Figure 3: Quick Auto-Pairing Connection

5. Operating Modes and Functions

5.1. Noise Reduction Mode

To activate noise reduction, press the dedicated noise reduction button on the transmitter. This mode helps to effectively reduce ambient sound frequencies for clearer audio.

5.2. Reverb Mode

To switch to reverb mode, press the power-on button on the transmitter. This mode adds a reverberation effect, creating a more spacious and stereo sound.

5.3. Original Sound Mode

To switch back to original sound mode (without reverb or noise reduction), press the power-on button again.

5.4. Real-time Monitoring

The transmitter comes with a Type-C headphone jack, allowing for real-time ear return. This enables live adjustments while recording and listening.

Figure 4: Real-time Audio Monitoring

5.5. Volume Control

Use the volume up and volume down buttons on the transmitter to adjust the microphone's input level.

6. Compatibility

• iPhone/iPad: Compatible with all iPhone/iPad models.
• Android Systems: Compatible with all Android systems. Note that Samsung series mobile phone models do not support original camera recording and require recording through a third-party APP camera. Ensure OTG function is enabled in phone settings.
• 3.5mm Audio Interface: The 3.5mm audio interface is not guaranteed to be 100% compatible due to varying pin definitions.

7. Specifications

Figure 5: Product Parameters

8. Maintenance

• Keep the microphone and receiver clean and dry. Avoid exposure to extreme temperatures or humidity.
• Store in a protective case when not in use to prevent damage.
• Regularly charge the devices to maintain battery health, even if not used frequently.

9. Troubleshooting

9.1. No Sound/Poor Sound Quality

• Check if the microphone and receiver are properly connected and powered on.
• Ensure the receiver is fully inserted into your device's port.
• Verify that the OTG function is enabled on Android devices.
• Check the volume levels on both the microphone and your recording device.
• If using a 3.5mm audio interface, ensure compatibility with your device.
• Try switching between noise reduction, reverb, and original sound modes to see if the issue persists.

9.2. Connectivity Issues

• Ensure both units are charged and powered on.
• Move closer to the recording device to rule out range issues. The effective receiving distance is up to 20 meters.
• Restart both the transmitter and receiver.

9.3. Samsung Camera Recording

• If using a Samsung phone, the original camera app may not support direct recording with this microphone. Use a third-party camera application for recording.

10. User Tips

• Wind Filter: While not explicitly mentioned as included, consider using an external wind filter (dead cat) for outdoor recordings to minimize wind noise, especially if recording in windy conditions.
• Optimal Distance: For best audio quality and signal stability, try to maintain a clear line of sight between the transmitter and receiver. The video demonstrates clear audio even at 20 meters, but closer distances generally yield better results.
• Android OTG: Always remember to enable the OTG function in your Android phone's settings for proper microphone detection and recording.
• Battery Life: The microphone offers approximately 6 hours of working time. Plan your recording sessions accordingly or carry a portable power bank for extended use.

11. Warranty and Support

For any issues or support, please contact the seller or refer to the product's official support channels. Keep your purchase receipt for warranty claims.