Introduction
The Holdsound BKM400 Wireless TV Headphones are designed to provide a high-quality, immersive audio experience for television viewing. Featuring 40mm dynamic drivers, these headphones deliver rich, balanced sound with deep bass and clear vocals, allowing for private listening without disturbing others. With a stable wireless transmission range of up to 165 feet and a plug-and-play setup, the BKM400 offers convenience and freedom of movement. The headphones are built for all-day comfort with premium protein leather earcups and an adjustable headband, supported by a long-lasting 20-hour battery life.
Image: Holdsound BKM400 Wireless TV Headphones and accompanying USB transmitter.
What's in the Box
Please ensure all items are present upon unboxing:
- Holdsound BKM400 Wireless TV Headphones
- USB Wireless Transmitter
- USB Charging Cable (USB-A to USB-C)
- Optical Audio Cable
- 3.5mm AUX Audio Cable
- RCA to 3.5mm Audio Adapter Cable
Image: The various cables and the USB transmitter included with the headphones.
Setup Instructions
The Holdsound BKM400 headphones offer multiple connection options for broad compatibility with various TV models. No Bluetooth pairing is required for these connections.
1. USB Connection (Direct Power & Audio)
This is the simplest method if your TV has a USB audio output.
- Plug the USB Wireless Transmitter directly into an available USB port on your TV.
- The transmitter will automatically power on and connect to the headphones.
- Ensure your TV's audio output is set to the USB device if necessary.
Image: A user plugging the USB transmitter into the back of a television for direct connection.
2. Optical Connection
Use this method for high-quality digital audio output from your TV.
- Connect the USB Wireless Transmitter to a USB power source (e.g., TV USB port for power only, or a wall adapter) using the USB charging cable.
- Connect one end of the Optical Audio Cable to the "OPTICAL OUT" port on the USB Wireless Transmitter.
- Connect the other end of the Optical Audio Cable to the "OPTICAL OUT" port on your TV.
- On your TV's audio settings, ensure the digital audio output format is set to PCM (Pulse-Code Modulation). Note: DTS or Dolby Digital formats are not supported.
Image: Close-up view of a TV's USB and Optical audio output ports, showing how the transmitter connects.
Image: Screenshot of a TV's audio settings menu, highlighting the option to enable TV speakers and set Digital Audio Format to PCM.
3. AUX Connection (3.5mm)
This connection uses the standard 3.5mm audio jack, common on many devices.
- Connect the USB Wireless Transmitter to a USB power source.
- Connect one end of the 3.5mm AUX Audio Cable to the "3.5mm OUT" port on the USB Wireless Transmitter.
- Connect the other end of the 3.5mm AUX Audio Cable to the "AUDIO OUT" (headphone jack) port on your TV.
4. RCA Connection
For TVs with red and white RCA audio output ports.
- Connect the USB Wireless Transmitter to a USB power source.
- Connect the 3.5mm AUX Audio Cable to the "3.5mm OUT" port on the USB Wireless Transmitter.
- Attach the RCA to 3.5mm Audio Adapter Cable to the other end of the 3.5mm AUX Audio Cable.
- Connect the red and white RCA plugs to the corresponding "AUDIO OUT" ports on your TV.
Image: The Holdsound USB transmitter showing its 3.5mm OUT, Optical OUT, and USB OUT ports, along with the corresponding audio cables (Optical, 3.5mm AUX, RCA adapter).
Image: A visual guide illustrating the universal compatibility of the headphones with TVs via Optical, USB, AUX, and RCA connections.
Operating Instructions
Powering On/Off
Once the transmitter is connected and powered, the headphones will automatically connect. To power on or off the headphones, locate the power button on the earcup and press and hold it for a few seconds.
Image: A close-up of the headphone earcup, showing the power button and indicator light.
Volume Control
The BKM400 headphones feature dual volume controls, allowing you to adjust the headphone volume independently from your TV's volume. Use the volume controls located on the headphones to set your preferred listening level.
Comfort and Fit
The headphones are designed for extended wear with premium protein leather earcups and an adjustable headband. Adjust the headband to ensure a comfortable and secure fit over your ears.
Image: A hand gently squeezing a headphone earcup, illustrating the soft protein leather material designed for comfort.
Image: A couple on a couch, one wearing the Holdsound headphones, demonstrating private listening while the other enjoys the TV at a normal volume.
Battery and Charging
The BKM400 headphones provide over 20 hours of continuous use on a full charge. When the battery is low, the indicator light on the headphones will signal. To charge:
- Connect the USB charging cable to the USB-C port on the headphones.
- Connect the other end of the USB charging cable to a USB power source (e.g., wall adapter, computer USB port).
- A full charge takes approximately 3 hours.
Image: A woman charging her Holdsound headphones via a USB-C cable connected to a wall adapter, illustrating charging convenience.
Maintenance
To ensure the longevity and optimal performance of your Holdsound BKM400 headphones:
- Clean the earcups and headband regularly with a soft, dry cloth.
- Avoid exposing the headphones or transmitter to extreme temperatures, humidity, or direct sunlight.
- Store the headphones in a cool, dry place when not in use.
- Do not attempt to disassemble or repair the device yourself, as this will void the warranty.
Troubleshooting
If you encounter issues with your Holdsound BKM400 headphones, please refer to the following common solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from headphones. | Transmitter not powered or connected correctly; TV audio output settings incorrect; Headphones not powered on or low battery. | Ensure the USB transmitter is properly plugged in and powered. Check all cable connections (USB, Optical, AUX, RCA). Verify your TV's audio output is set to the correct source (e.g., PCM for Optical). Power on headphones and check battery level. |
| Static or distorted sound. | Interference; Incorrect TV audio format (for Optical); Loose connection. | Move away from other wireless devices that might cause interference. If using Optical, confirm TV audio output is set to PCM. Re-seat all cables firmly. |
| Headphones not connecting to transmitter. | Transmitter or headphones not powered on; Out of range. | Ensure both the transmitter and headphones are powered on. Bring headphones closer to the transmitter. |
| Short battery life. | Incomplete charging; Aging battery. | Ensure headphones are fully charged (approx. 3 hours). If battery life significantly degrades over time, contact support. |
If these steps do not resolve the issue, please contact Holdsound customer support for further assistance. We aim to resolve all problems within 10 hours.
Specifications
| Feature | Detail |
|---|---|
| Model Name | BKM400 |
| Connectivity Technology | Wireless (via USB Transmitter) |
| Wireless Range | Up to 165 feet (approx. 50 meters) |
| Audio Driver Type | 40mm Dynamic Driver |
| Battery Life | Up to 20 Hours |
| Charging Time | Approx. 3 Hours (USB-C fast charging) |
| Ear Placement | Over Ear |
| Material | Plastic, Premium Protein Leather (earcups) |
| Compatible Devices | Television (via Optical, AUX, RCA, USB outputs) |
| Item Weight | 1.01 pounds |
| Frequency Range | 20 Hz - 20,000 Hz |
Warranty and Support
Holdsound is committed to providing high-quality products. The materials used in our TV headphones are designed for durability and long-term performance.
For any questions or concerns regarding your Holdsound BKM400 Wireless TV Headphones, please do not hesitate to contact our customer support team. We are dedicated to providing prompt assistance and aim to resolve all inquiries within 10 hours.
Please refer to your purchase documentation for specific warranty terms and contact information.