1. Introduction
The BOYA BY-WM4 Pro RXD/RXU is a compact and versatile digital 2.4GHz wireless receiver designed to enhance audio recording for mobile journalists, YouTubers, vloggers, and content creators. This receiver is available in two versions: the BY-WM4 Pro RXD for iOS devices with a Lightning connector, and the BY-WM4 Pro RXU for Android and other devices with a Type-C connector. Both models offer a plug-and-play design and dual-channel capability, allowing them to work with two body-pack transmitters (TX4 Pro, sold separately) for capturing audio in various indoor and outdoor scenarios.
Key Features:
- Digital 2.4GHz wireless technology for reliable audio transmission.
- Ultracompact and miniature-size design for portability.
- Dual-channel receiver, compatible with two transmitters (TX4 Pro, sold separately).
- BY-WM4 Pro RXD: Apple MFi certified Lightning connector for iOS devices.
- BY-WM4 Pro RXU: Type-C connector for Android smartphones, tablets, and compatible devices.
- Selectable stereo and mono output modes.
- 3.5mm headphone jack for real-time audio monitoring.
- Volume control buttons for precise audio level adjustment.
- Powered directly by the host device (iOS/Android smartphone/tablet).
2. Package Contents
Please check the contents of your package to ensure all items are present and in good condition.
BY-WM4 Pro RXD Package:
- BY-WM4 Pro RXD Receiver (Lightning)
- SIM Ejector Tool (for pairing button)
- Carrying Case
- Retail Box
BY-WM4 Pro RXU Package:
- BY-WM4 Pro RXU Receiver (Type-C)
- SIM Ejector Tool (for pairing button)
- Carrying Case
- Retail Box
3. Component Identification
Familiarize yourself with the different parts of your receiver:
BY-WM4 Pro RXD (Lightning)
- Lightning Connector: For connecting to iOS devices.
- Headphone Jack (3.5mm): For real-time audio monitoring.
- M/S Switch: Toggles between Mono (M) and Stereo (S) output modes.
- Pair Button: Used to initiate pairing with a transmitter.
- Power LED: Indicates power status and pairing status.
- Volume +/-: Adjusts the audio output level.
- Built-In Internal Antenna: For wireless signal reception.
BY-WM4 Pro RXU (Type-C)
- Type-C Connector: For connecting to Android and other compatible devices.
- Headphone Jack (3.5mm): For real-time audio monitoring.
- M/S Switch: Toggles between Mono (M) and Stereo (S) output modes.
- Pair Button: Used to initiate pairing with a transmitter.
- Power LED: Indicates power status and pairing status.
- Volume +/-: Adjusts the audio output level.
- Built-In Internal Antenna: For wireless signal reception.
4. Setup Instructions
Follow these steps to set up your wireless microphone receiver:
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Connect the Receiver:
- For BY-WM4 Pro RXD: Plug the Lightning connector of the receiver directly into the Lightning port of your iPhone, iPad, or iPod touch.
- For BY-WM4 Pro RXU: Plug the Type-C connector of the receiver directly into the Type-C port of your Android smartphone, tablet, or compatible device.
Figure 6: Connecting the RXD receiver to an iPhone. - Power On Transmitter (TX4 Pro): Ensure your BOYA TX4 Pro transmitter (sold separately) is powered on and has a working microphone connected.
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Pairing the Receiver and Transmitter:
- Turn on both the receiver and the transmitter.
- On the receiver, use the provided SIM ejector tool or a similar thin object to press the 'Pair' button. The Power LED on the receiver will start blinking rapidly, indicating it's in pairing mode.
- On the transmitter, follow its specific pairing instructions (usually involves pressing a pairing button).
- Once successfully paired, the Power LED on the receiver will turn solid blue.
- Select Output Mode: Use the M/S switch on the receiver to select between Mono (M) or Stereo (S) output, depending on your recording needs and the number of transmitters in use.
- Monitor Audio: Plug headphones into the 3.5mm headphone jack on the receiver to monitor your audio in real-time. This is crucial for ensuring optimal sound quality.
- Adjust Volume: Use the Volume +/- buttons on the receiver to set the appropriate listening level for your headphones. Note that this adjusts monitoring volume, not necessarily the recording level on your device.
5. Operating Instructions
Once set up, operating the BY-WM4 Pro receiver is straightforward:
- Start Recording: Open your preferred audio or video recording application on your smartphone/tablet. The device should automatically recognize the BY-WM4 Pro receiver as the external audio input.
- Monitor Audio Levels: While recording, continuously monitor the audio through your headphones. Pay attention to any distortion or low signal issues.
- Adjust Transmitter Gain: For optimal recording quality, adjust the gain level on your TX4 Pro transmitter (if available) to prevent clipping or ensure sufficient volume.
- Maintain Line of Sight: For best wireless performance, try to maintain a clear line of sight between the transmitter and receiver, especially at longer distances.
- Power Source: The receiver draws power directly from your connected smartphone or tablet. Ensure your device has sufficient battery life for your recording session.
6. Maintenance
To ensure the longevity and optimal performance of your BOYA BY-WM4 Pro receiver, follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the exterior of the receiver. Do not use harsh chemicals or abrasive cleaners.
- Storage: When not in use, store the receiver in its protective carrying case in a cool, dry place, away from direct sunlight and extreme temperatures.
- Avoid Moisture: Keep the receiver away from water, rain, and high humidity.
- Handle with Care: Avoid dropping or subjecting the receiver to strong impacts.
- Connector Care: Ensure the Lightning or Type-C connector is clean and free of debris before plugging it into your device.
7. Troubleshooting
- Q: No audio is being recorded or monitored.
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- Ensure the receiver is securely plugged into your smartphone/tablet.
- Verify that the transmitter (TX4 Pro) is powered on and paired with the receiver (Power LED on receiver should be solid blue).
- Check the microphone connected to the transmitter is working correctly.
- Confirm that your recording application on the smartphone/tablet is set to use the external microphone input.
- Check the volume levels on both the transmitter and the receiver.
- Q: How do I pair the receiver with the transmitter?
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Turn on both the receiver and the transmitter. On the receiver, press the 'Pair' button (often recessed, requiring a SIM ejector tool). The Power LED will blink rapidly. On the transmitter, follow its specific pairing instructions. The receiver's Power LED will turn solid blue upon successful pairing.
- Q: Can I use two transmitters with one receiver?
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Yes, the BY-WM4 Pro receivers are dual-channel, meaning they can receive signals from two separate TX4 Pro transmitters simultaneously. Ensure both transmitters are paired with the receiver and select the appropriate stereo or mono mode on the receiver.
- Q: Poor audio quality or interference.
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- Ensure the transmitter and receiver are within the optimal operating range (up to 60m/197ft without obstacles).
- Minimize physical obstructions between the transmitter and receiver.
- Avoid environments with strong 2.4GHz interference (e.g., Wi-Fi routers, other wireless devices).
- Check the microphone connection to the transmitter for any loose cables.
8. Specifications
| Feature | Specification |
|---|---|
| RF Modulation | GFSK (Gauss Frequency Shift Keying) |
| Frequency Band | 2.4GHz (2405-2478MHz) |
| Antenna | PIFA Antenna |
| Connector (RXD) | Apple MFi Certified Lightning Connector |
| Connector (RXU) | Type-C Connector |
| Operating Range | Up to 60m (197ft) without obstacle |
| Power Requirements | Supplied by iOS/Android device |
| Dimensions | 82 × 30.7 × 12mm (3.2 × 1.2 × 0.5”) |
| Weight | 12g (0.4oz) |
| Polar Patterns (Microphone) | Omnidirectional |
| Transducer (Microphone) | Condenser Microphone |
| Communication | Wireless |
| Certifications | CE, FCC |
9. User Tips
- Pre-Recording Check: Always perform a quick sound check before starting any important recording session. This includes checking pairing, audio levels, and monitoring through headphones.
- Battery Management: Since the receiver is powered by your smartphone, be mindful of your phone's battery life, especially during long recording sessions. Consider carrying a portable power bank.
- Optimal Placement: For the best audio quality, ensure the lavalier microphone (connected to the transmitter) is positioned correctly on the speaker, typically about 6-8 inches from the mouth.
- Environmental Awareness: Be aware of your surroundings. While the 2.4GHz band is robust, strong Wi-Fi signals or other wireless devices can cause interference. Try to find a clear channel if possible, or move to a less congested area.
10. Warranty and Support
BOYA products are designed for reliability and performance. For warranty information, technical support, or service inquiries, please contact your local BOYA distributor or the official BOYA customer support channel. Keep your purchase receipt as proof of purchase for any warranty claims.
