Shure BLX4 Single Channel Wireless Receiver User Manual (H9 Band)

1. Introduction

The Shure BLX4 is a single-channel wireless receiver designed for use with Shure BLX wireless microphone systems. It provides reliable, professional-quality audio with a straightforward setup process. This receiver operates within the H9 frequency band (512-542 MHz) and requires a compatible Shure BLX series transmitter (BLX1 or BLX2), which is sold separately.

2. Product Overview

2.1 Receiver Components

Image 1: Front Panel of BLX4 Receiver. This image displays the front panel of the Shure BLX4 receiver, showing the Shure logo, BLX4 model designation, 'audio' and 'ready' LED indicators, a digital display for group and channel information, and control buttons for 'group (A-Y)', 'channel (0-9)', and 'power'.

Image 2: Rear Panel of BLX4 Receiver. This image shows the rear panel of the Shure BLX4 receiver, featuring the power input (12-15V, 160mA), a switch for antenna connection (1 or 2), an XLR 'MIC OUT' port, and a 1/4-inch 'INSTRUMENT OUT' port. The model number 'BLX4' and 'MADE IN CHINA' are also visible.

2.2 Key Features

• Frequency Band: H9 (512-542 MHz). Ensure compatibility with your region and transmitter.
• Operating Range: Up to 300 feet (100 meters) line of sight.
• System Expansion: Supports up to 12 compatible systems per frequency band.
• QuickScan: One-touch frequency selection for quick and easy setup.
• Output Connectors: XLR and 1/4-inch (6.3 mm) output.
• Indicators: Audio status LED and Ready LED for clear operational feedback.

3. Setup

3.1 Frequency Band Selection

Before initial setup, verify that the H9 frequency band (512-542 MHz) is suitable for your geographical location. Incompatible frequency bands may result in interference or non-operation. Refer to the Shure website's Wireless Frequency Finder for detailed regional information.

Image 3: Wireless Frequency Selection Chart. This chart illustrates available frequency bands (H9, H10, H11, J11) and their compatibility across various US cities. Green bars indicate active frequencies for each location. Users should consult the Shure Frequency Finder for comprehensive and up-to-date regional information.

3.2 Connecting the Receiver

1. Power Connection: Connect the supplied power supply to the BLX4 receiver's power input and then to an AC power source.
2. Audio Output: Connect the receiver's XLR or 1/4-inch output to your mixer or amplifier's input. Use the XLR output for microphone-level signals and the 1/4-inch output for instrument-level signals.
3. Antennas: Ensure the antennas are securely attached to the receiver and positioned for optimal signal reception.

3.3 Pairing with a Transmitter

The BLX4 receiver must be paired with a compatible Shure BLX series transmitter (BLX1 bodypack or BLX2 handheld). Both the receiver and transmitter must be set to the same group and channel for proper operation.

1. Power On: Turn on the BLX4 receiver and the BLX transmitter.
2. QuickScan: On the BLX4 receiver, press the 'Group' button. The receiver will automatically scan for the clearest available frequency and display the selected group and channel.
3. Set Transmitter: Manually set your BLX transmitter to match the group and channel displayed on the BLX4 receiver. Refer to your transmitter's manual for specific instructions on setting its group and channel.
4. Verify Connection: The 'Ready' LED on the receiver should illuminate steadily, indicating a successful link with the transmitter. The 'Audio' LED will light up when audio is detected from the transmitter.

4. Operating Instructions

4.1 Powering On/Off

Press and hold the 'Power' button on the front panel of the BLX4 receiver to turn it on or off.

4.2 Monitoring Status

• Ready LED: A solid green light indicates the receiver is linked to a transmitter. If it flashes or is off, check the transmitter's power and frequency settings.
• Audio LED: Illuminates when audio signal is received from the transmitter. A red light may indicate an excessively strong input signal (clipping).

4.3 Adjusting Group and Channel (Manual Selection)

While QuickScan is recommended for ease of use, you can manually select a group and channel if needed:

1. Press the 'Group' button to cycle through available groups (A-Y).
2. Press the 'Channel' button to cycle through channels (0-9) within the selected group.
3. Ensure your transmitter is set to match the manually selected group and channel.

5. Maintenance

• Cleaning: Use a soft, dry cloth to clean the receiver's exterior. Avoid using abrasive cleaners or solvents.
• Storage: Store the receiver in a dry, cool environment away from direct sunlight and extreme temperatures.
• Antennas: Handle antennas carefully to prevent damage. Ensure they are properly connected during use.

6. Troubleshooting

7. Specifications

• Model: BLX4
• Frequency Band: H9 (512-542 MHz)
• Dimensions (H x W x D): Approximately 1.57 x 13.5 x 4 inches (4 x 34.3 x 10.2 cm)
• Weight: 2.3 pounds (1.04 kg)
• Output Connectors: 1 x XLR, 1 x 1/4" (6.3 mm) TS
• Special Features: QuickScan, Diversity Technology
• Audio Output Mode: Stereo
• Surround Sound Channel Configuration: 2 Channel
• Power Supply: 12-15V DC, 160mA (external power supply included)
• Date First Available: October 6, 2015

8. Warranty and Support

The Shure BLX4 Single Channel Wireless Receiver includes a 2-year limited warranty from the date of purchase. For warranty claims, technical assistance, or further support, please contact Shure customer service or visit the official Shure website. Keep your proof of purchase for warranty validation.