OSD Nero 5.8GHz Wireless Surround Sound Rear Speaker Amplifier (WRSK250)

1. Important Safety Information

Please read all safety instructions before operating this device.

• Keep the device away from heat sources and moisture.
• Do not expose to extreme temperatures or humidity.
• Follow general safety guidelines for electronic devices to prevent electric shock or fire.
• Do not attempt to disassemble or modify the unit. Refer all servicing to qualified personnel.

2. Product Overview

The OSD Nero WRSK250 is a 5.8GHz wireless system designed to provide surround sound to your media room without the need for extensive speaker cabling. This kit includes a transmitter and a receiver with a built-in 2 x 50W amplifier and a subwoofer output, offering a convenient solution for expanding your home theater audio.

Key Features:

• 5.8 GHz Wireless Signal: Ensures clear, uninterrupted audio by operating on a less crowded frequency band, minimizing interference from other wireless devices.
• Extended Range: Provides wireless surround sound connectivity up to 100 feet away, allowing flexible placement of rear speakers.
• Integrated Amplifier: The receiver unit features a 2 x 50W amplifier, capable of powering passive rear speakers.
• Subwoofer Output: Includes a dedicated output for connecting a wired subwoofer, enhancing bass performance.
• Easy Installation: Designed for simple plug-and-play setup with most home theater receivers, requiring no complex configuration.

3. Package Contents

Verify that all items are present in your package:

• 1 x OSD Nero WRSK250 Wireless Transmitter
• 1 x OSD Nero WRSK250 Wireless Receiver with Amplifier
• 1 x Transmitter Power Adapter (DC 9V)
• 1 x Receiver Power Adapter (DC 24V)
• 1 x Speaker Level Input Cable (for transmitter)
• 1 x RCA Cable (for subwoofer output, if applicable)

Image: Power adapters for the OSD Nero WRSK250 system. The smaller adapter is for the transmitter, and the larger one is for the receiver/amplifier.

4. Setup Instructions

4.1. Connecting the Transmitter Unit

1. Connect the speaker level input cable from your main home theater receiver's rear speaker outputs (or subwoofer output) to the SPEAKER INPUT (L/R) terminals on the OSD Nero WRSK250 Transmitter unit. Ensure correct polarity (+ to + and - to -).
2. Plug the Transmitter Power Adapter (DC 9V) into the DC IN 9V port on the Transmitter.
3. Plug the power adapter into a wall outlet. The power indicator light on the transmitter will illuminate.

4.2. Connecting the Receiver/Amplifier Unit

1. Connect your passive rear speakers to the SPEAKER OUTPUT (L/R) terminals on the OSD Nero WRSK250 Receiver unit. Observe correct polarity.
2. If using an external powered subwoofer, connect an RCA cable from the SUBWOOFER OUT port on the Receiver to the LFE/Subwoofer input on your powered subwoofer.
3. Plug the Receiver Power Adapter (DC 24V) into the DC IN 24V port on the Receiver.
4. Plug the power adapter into a wall outlet. The power indicator light on the receiver will illuminate.

4.3. Pairing the Units

The Transmitter and Receiver units are designed to automatically pair upon power-up. Once both units are powered on, their indicator lights should turn solid blue, indicating a successful wireless connection. If the lights are flashing or not solid blue, press the 'M' (Mode/Pairing) button on both units simultaneously to initiate manual pairing. Allow a few seconds for them to connect.

Image: Rear panel of the OSD Nero WRSK250 units, showing speaker inputs/outputs, subwoofer output, and power connections.

5. Operating Instructions

5.1. Power On/Off

Each unit has a dedicated power switch. Turn on both the Transmitter and Receiver units. The indicator lights will show their status (solid blue for connected, flashing for pairing).

5.2. Volume Control

The Receiver unit features a volume control knob. Adjust this knob to set the desired output level for your rear speakers. Fine-tune the overall balance using your main home theater receiver's settings.

5.3. Signal Stability

The 5.8GHz wireless signal is designed for stability. Ensure both units are within the 100-foot range and have a clear line of sight for optimal performance. Avoid placing units near large metal objects or other strong wireless interference sources.

6. Maintenance

To ensure the longevity and optimal performance of your OSD Nero WRSK250 system, follow these maintenance guidelines:

• Cleaning: Use a soft, dry cloth to clean the exterior of the units. Do not use liquid cleaners or aerosols.
• Ventilation: Ensure the units have adequate ventilation. Do not block any ventilation openings.
• Storage: If storing the units for an extended period, disconnect them from power and store in a cool, dry place.

7. Troubleshooting

If you encounter issues with your OSD Nero WRSK250, refer to the following common troubleshooting steps:

• No Sound:
  • Ensure both Transmitter and Receiver units are powered on and indicator lights are solid blue.
  • Check all audio connections (speaker level input to transmitter, speaker output from receiver, subwoofer output if used).
  • Verify the volume on the receiver unit is turned up.
  • Confirm your main home theater receiver is sending audio to the connected outputs.
• Interference/Signal Dropouts:
  • Relocate the units to improve line of sight and reduce potential interference from other 5.8GHz devices (e.g., Wi-Fi routers, cordless phones).
  • Ensure units are within the 100-foot operational range.
  • Try re-pairing the units by pressing the 'M' button on both simultaneously.
• Units Not Pairing:
  • Ensure both units are powered on.
  • Press and hold the 'M' button on both the Transmitter and Receiver for a few seconds until the indicator lights flash, then release. They should attempt to re-pair.
  • Power cycle both units (unplug and replug power adapters) and try pairing again.

8. Specifications

Image: Dimensions of the OSD Nero WRSK250 units, showing approximate measurements of 2 x 7 x 4 inches.

9. Warranty and Support

For warranty information and technical support, please refer to the documentation included with your purchase or visit the official OSD Audio website. OSD Audio is committed to providing high-quality home and commercial audio products and support.