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Distribution Box Delay Unit

A Distribution Box Delay Unit is a device that distributes audio or video signals to multiple outputs while applying a controlled delay to synchronize or manage timing across a production or broadcast system.Function and Purpose

A distribution box delay unit combines signal distribution and time delay functions. It allows a single input signal—audio, video, or digital SDI—to be sent to multiple outputs while introducing a precise delay. This is essential for:

  • Live broadcast delay to prevent inappropriate content from going on air
  • Lip-sync correction between audio and video
  • Frame synchronization across multiple video feeds
  • Timing adjustments in complex production chains These units can handle both analog and digital signals, depending on the model, and often allow separate delays for each output channel .
Examples of Units
  • FOR-A EDA Series: The EDA-1000, EDA-2000, and EDA-2100 are 1RU units that distribute up to eight outputs from a single input. They support SDI formats (12G/3G/HD/SD) and can delay signals up to 40 seconds (or 80 seconds with an optional module). Separate delays can be set for multiple inputs, and both audio and video can be delayed independently .
  • Samim DLY Series: These modular or standalone units provide delays for 3G/HD/SD-SDI video and AES audio streams. They are widely used in broadcast studios for profanity delay, frame synchronization, and lip-sync adjustments. The delay can be applied per frame or for a defined duration, and settings can be controlled via a web interface .
  • RU-ADL2 (RDL): A DSP-based analog audio delay unit that provides two separate outputs with adjustable delays from 0 to 135 milliseconds. It is suitable for professional audio environments where precise timing adjustments are required .
  • SRS DB64 Coax Delay Box: Provides high-bandwidth analog delays from 0 to 63.5 nanoseconds with 0.5 ns resolution, useful for timing photomultiplier coincidences or signal phase adjustments .
Key Features
  • Adjustable Delay: Delay can range from nanoseconds (coax delay) to several seconds (broadcast SDI delay).
  • Multiple Outputs: Distribute a single input to multiple destinations without signal degradation.
  • Signal Compatibility: Supports analog audio, digital audio (AES), and video (SDI, HD, 3G, 12G).
  • Control Options: Front-panel keys, web-based interfaces, or remote control for delay settings.
  • Professional Applications: Live broadcast, studio production, corporate events, and worship services.
Summary

A distribution box delay unit is a versatile tool in professional audio/video setups, combining signal distribution with precise timing control. It ensures synchronized outputs, prevents content errors in live broadcasts, and allows fine-tuning of audio/video alignment across multiple channels, making it essential for modern production and broadcast workflows .

Distribution Box Delay Unit

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Technical note

This reference is intended for preliminary specialty-cable research. Compatibility, link budgets, fire performance, installation methods, test limits and applicable standards must be verified for the specific project.

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