1. Introduction
The BOYA BY-WM4 PRO K2 is a compact 2.4GHz wireless microphone system designed for capturing clear audio with smartphones, tablets, DSLR cameras, camcorders, and computers. This system is ideal for various applications including vlogging, live streaming, interviews, commentary, and general audio recording. It features dual transmitters and one receiver, allowing for two-person interviews or recordings. The system offers both stereo and mono output options for flexible post-production.
2. Package Contents
Image: All components of the BOYA BY-WM4 PRO K2 system, including transmitters, receiver, microphones, cables, and carrying case.
The BOYA BY-WM4 PRO K2 system includes the following items:
- 2 x Belt-pack Transmitters (BY-WM4 PRO TX)
- 1 x Portable Receiver (BY-WM4 PRO RX)
- 2 x Omnidirectional Lavalier Microphones
- 1 x Carrying Case
- 1 x 3.5mm to TRS Audio Output Cable (for cameras)
- 1 x 3.5mm to TRRS Audio Output Cable (for smartphones)
- 1 x Cold Shoe Holder
- 2 x Windproof Cotton (windscreens)
- 3 x Back Clips
- 1 x Portable Zipper Bag
3. Product Overview
Transmitter (TX) and Receiver (RX) Components
Image: Detailed diagram of the transmitter (TX) and receiver (RX) units, highlighting their various ports and controls.
Familiarize yourself with the key components of the transmitter and receiver:
- Microphone Input: 3.5mm jack for connecting the lavalier microphone.
- Power LED: Indicates power status and pairing status.
- Power ON/OFF Switch: Controls the power for the unit.
- Pair Button: Used to initiate the pairing process between transmitter and receiver.
- Antenna: For wireless signal transmission and reception.
- Battery Compartment: Holds two AAA batteries.
- LINE OUT (Audio Output) Jack: 3.5mm output for connecting to recording devices.
- Earphone Jack: 3.5mm output for real-time audio monitoring.
- Volume +/- Buttons: Adjusts the output level (attenuation) of the receiver.
- Shoe Mount Adapter: Allows the receiver to be mounted on a camera's hot/cold shoe.
4. Setup
4.1 Battery Installation
Image: Open battery compartment of a BY-WM4 PRO K2 unit, showing where to insert two AAA batteries.
- Locate the battery compartment on the back of both the transmitter and receiver units.
- Slide open the battery cover.
- Insert two AAA batteries into each unit, ensuring correct polarity (+/-).
- Close the battery cover securely.
4.2 Connecting to Recording Devices
Image: Visual guide for connecting the wireless microphone system to smartphones, tablets, cameras, and camcorders using the appropriate 3.5mm cables.
- For Smartphones, Tablets, and Laptops (with 3.5mm TRRS input): Use the provided 3.5mm TRS to TRRS audio output cable. Connect the TRS end to the receiver's LINE OUT jack and the TRRS end to your device's headphone/microphone jack. Newer iPhone and Android models may require an additional adapter (not included).
- For DSLR Cameras, Camcorders, and Audio Recorders (with 3.5mm TRS input): Use the provided 3.5mm TRS to TRS audio output cable. Connect one TRS end to the receiver's LINE OUT jack and the other TRS end to your camera's microphone input.
- Mounting the Receiver: Attach the cold shoe holder to the receiver, then slide it onto your camera's hot/cold shoe mount for secure placement.
4.3 Pairing the Units
The transmitters and receiver should be paired before use:
- Ensure both the transmitter(s) and receiver have fresh batteries installed.
- Turn on all units using their respective Power ON/OFF switches.
- On the receiver, press and hold the 'Pair' button until the Power LED starts blinking rapidly.
- On each transmitter, press and hold the 'Pair' button until its Power LED also blinks rapidly.
- Once successfully paired, the Power LEDs on all units will turn solid blue. If pairing fails, turn off all units and repeat the process.
5. Operating Instructions
5.1 Power On/Off
To power on or off any unit (transmitter or receiver), slide the Power ON/OFF switch to the 'ON' or 'OFF' position respectively.
5.2 Adjusting Volume (Receiver)
Image: Close-up of the receiver's side panel, showing the volume up (+) and volume down (-) buttons for adjusting audio output.
The receiver features volume +/- buttons to control the output level (attenuation) of the audio signal. Press the '+' button to increase the volume and the '-' button to decrease it. Adjust this to achieve an optimal recording level on your connected device, avoiding clipping or distortion.
5.3 Audio Monitoring
Connect headphones to the 3.5mm Earphone Jack on the receiver to monitor the audio in real-time. This allows you to ensure clear sound capture and make necessary adjustments during recording.
5.4 Mono/Stereo Mode Selection
The receiver offers a switch to select between mono and stereo output modes. Choose the mode that best suits your recording needs. Mono mode combines both microphone signals into a single channel, while stereo mode keeps them separate, providing more flexibility for post-editing.
6. Maintenance
- Cleaning: Use a soft, dry cloth to clean the units. Avoid using harsh chemicals or abrasive materials.
- Storage: Store the microphone system in its carrying case in a cool, dry place when not in use.
- Battery Care: Remove batteries from the units if they will not be used for an extended period to prevent leakage. Always use fresh, high-quality AAA batteries.
- Microphone Care: Handle the lavalier microphones gently. Use the provided windscreens to protect against wind noise and moisture.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound or low sound output |
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| Intermittent audio or signal dropouts |
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| Distorted or noisy audio |
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| Units fail to pair |
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8. Specifications
Image: Comprehensive table outlining the technical specifications of the BOYA BY-WM4 PRO K2 system.
| Feature | Specification |
|---|---|
| RF Modulation | GFSK (Gauss Frequency Shift Keying) |
| Frequency Band | 2.4GHz (2405-2478MHz) |
| Frequency Response | 35Hz-14kHz ±3dB |
| Signal/Noise Ratio | 84dB or more |
| Earphone Output Level | 32Ω, 65mW |
| Reception Sensitivity | -90dB +/- 3dB / 0dB=1V/Pa, 1kHz |
| Audio Input Connector | 3.5mm mini jack |
| Operating Range | 60m (197ft) (without obstacle) |
| Power Requirements | 3V DC (Two AAA size batteries per unit) |
| Consumption Power | 3V/70mA |
| Dimensions (W/H/D) | Receiver: 45mm x 70mm x 35mm (1.8" x 2.8" x 1.4") Transmitter: 45mm x 70mm x 35mm (1.8" x 2.8" x 1.4") |
| Weight | Receiver: 47g (1.7 oz) Transmitter: 47g (1.7 oz) |
9. Warranty and Support
BOYA products are designed for reliability and performance. For specific warranty information, please refer to the warranty card included in your product package or visit the official BOYA website. If you encounter any issues or require technical assistance, please contact BOYA customer support through their official channels. You can also visit the BOYA Store on Amazon for more product information and support resources.
