MIDAS DL151 Digital Stage Box User Manual

1. Product Overview

The MIDAS DL151 is a 2U 19-inch fixed-configuration rack I/O unit designed for professional audio applications. It features 24 mic/line level inputs and is engineered to deliver high-quality audio performance. The DL151 integrates seamlessly with MIDAS PRO and M32 Series digital consoles, providing a digital snake connection from the Front of House to the stage.

Key features include award-winning MIDAS microphone preamplifiers with 2.5 dB analogue gain steps and dual redundant AES50 network ports for reliable operation. The unit supports remote operation up to 100 meters via CAT5/5e cable and offers selectable 96 kHz or 48 kHz sample rate operation.

Image: Front view of the MIDAS DL151 Digital Stage Box. This image displays the unit's front panel, including the MIDAS logo, model number DL151, audio system I/O label, PSU status LEDs, Ethernet control LEDs, AES50 audio LEDs, an LCD display showing "MIDAS DL151 LINE I/O UNIT 1", and navigation buttons. A ventilation grille is visible on the left side.

2. Package Contents

Ensure all items listed below are present in your package:

• MIDAS DL151 Digital Stage Box (24-Input)
• Power Cable
• Documentation (this manual)

3. Setup and Installation

3.1 Rack Mounting

The DL151 is designed for installation in a standard 19-inch equipment rack, occupying 2U of rack space. Ensure adequate ventilation around the unit to prevent overheating.

3.2 Power Connection

Connect the supplied power cable to the IEC inlet on the rear panel of the DL151 and to a suitable AC power source. The unit features an integrated power supply.

3.3 Audio Connections

The DL151 provides 24 microphone/line level inputs via XLR connectors on the rear panel. Connect your microphones or line-level sources to these inputs. The unit features award-winning MIDAS microphone preamplifiers with switchable +48 V phantom power for condenser microphones.

3.4 Network Connections

Utilize the dual redundant AES50 network ports (Neutrik etherCON) on the rear panel to connect the DL151 to your MIDAS digital console or other AES50-equipped devices. Use high-quality CAT5/5e or better Ethernet cables for reliable data transmission. These ports enable remote control and audio signal transfer up to 100 meters.

Image: Rear view of the MIDAS DL151 Digital Stage Box. This image shows the back panel with 24 XLR input connectors arranged in three rows (A, B, C), an IEC power inlet with an on/off switch, Ethernet control port, diagnostics port, boot mode switch, and two AES50 audio ports (1 and 2) with Neutrik etherCON connectors.

4. Operation

4.1 Powering On

After all connections are made, switch on the power using the rear panel switch. Observe the PSU status indicator LEDs on the front panel to confirm proper power supply operation.

4.2 Front Panel Controls and Display

The front panel features an LCD display and navigation buttons for local configuration. All settings, including sample rate (96 kHz or 48 kHz) and phantom power, can be adjusted directly from the front panel. The LCD provides intuitive menu navigation.

Image: Close-up of the MIDAS DL151 front panel. This image highlights the LCD display, which shows "MIDAS DL151 LINE I/O UNIT 1", and the four navigation buttons (MENU, UP, DOWN, EXIT) used for local control and configuration.

4.3 Remote Control

The DL151 is primarily designed for remote control from a connected MIDAS digital mixing console. All configuration settings can be adjusted remotely from the console, providing centralized control over the stage box parameters.

4.4 AES50 Network Status

Monitor the AES50 audio indicator LEDs on the front panel. These LEDs provide status information regarding the network connection, including link status and error conditions. Dual redundancy ensures continuous operation even if one network link fails.

5. Maintenance

To ensure the longevity and optimal performance of your DL151, follow these general maintenance guidelines:

• Cleaning: Regularly clean the exterior of the unit with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
• Ventilation: Ensure that the ventilation grilles are free from dust and obstructions to maintain proper airflow and prevent overheating.
• Environmental Conditions: Operate the unit within specified temperature and humidity ranges. Avoid exposure to moisture or extreme temperatures.
• Cable Management: Secure all cables to prevent accidental disconnections or damage.

6. Troubleshooting

If you encounter issues with your DL151, refer to the following common troubleshooting steps:

• No Power: Check the power cable connection and ensure the power switch on the rear panel is in the 'ON' position. Verify the PSU status indicator LEDs on the front panel.
• No Audio:
  • Verify that microphones or line sources are correctly connected to the XLR inputs.
  • Check if +48 V phantom power is enabled for condenser microphones, if required.
  • Ensure the AES50 network connection is active and stable. Check the AES50 audio indicator LEDs for any error signals.
  • Confirm that the sample rate setting on the DL151 matches the connected digital console.
• Remote Control Issues: Ensure the Ethernet control cable is securely connected. Verify network settings on both the DL151 and the connected console.
• Intermittent Connection: Check all CAT5/5e cables for damage or loose connections. Ensure they meet the required specifications for AES50 networking.

For persistent issues, consult the MIDAS digital console manual or contact MIDAS technical support.

7. Technical Specifications

8. Warranty and Support

8.1 Warranty Information

The MIDAS DL151 is covered by a manufacturer's warranty. Please refer to the warranty card included with your product or visit the official MIDAS website for detailed terms and conditions.

8.2 Technical Support

For technical assistance, product inquiries, or service requests, please contact MIDAS customer support. Contact information can typically be found on the official MIDAS website or in your product documentation.