How to Distribute the Signal in a DMX Network for 100+ Fixtures: Diagram, Calculations, and Recommendations 🌟

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As the number of fixtures in DMX networks increases, the load on the line grows, raising the risk of failures and signal loss. Incorrect distribution can lead to erratic operation or complete equipment failure. We consulted with an engineer from Sundrax Alex Chomsky to learn how to properly design a DMX network for large-scale projects. ✅

DMX controller with multiple outputs for large lighting setups

Splitter Selective Pro distributing DMX signals to multiple lines


How Many Fixtures Can Be Connected to One DMX Line? 🔌

According to the DMX512 standard:

  • Maximum: 32 fixtures on one line (without active repeaters)
  • Maximum line length: up to 300 meters (1,000 feet) Exceeding these parameters may cause signal distortion or loss. ⚠️ Therefore, in installations with dozens or hundreds of fixtures, it is essential to use splitters and DMX repeaters.
Diagram of a DMX network layout for over 100 fixtures


How to Distribute the Load Correctly 🛠️

Using splitters allows you to:

  • Divide the network into independent physical segments
  • Protect the network with galvanic isolation
  • Simplify maintenance and troubleshooting Example: For 120 fixtures, you can use 1 controller + 2 splitters with 4 outputs each, with each output handling a line of 15 fixtures. This creates 8 separate lines, each with 15 fixtures. ✅
Termination resistor at the end of a DMX line


Example Diagram for 100+ Fixtures 📊

DMX Controller (2 outputs) 

└── Splitter Selective Pro (8 outputs) 

├── Line 1 → 15 fixtures 

├── Line 2 → 15 fixtures 

├── Line 3 → 12 fixtures 

├── … 

└── Line 8 → 10 fixtures 

Each line must be terminated with a termination resistor. 🔧

Galvanic isolation in a DMX splitter for network protection


What to Consider During Design 🧠

  • Plan the address space in advance: each DMX universe has 512 channels, which can be quickly exhausted with multi-channel fixtures.
  • Isolate lines with powerful equipment (Dimmers, Converters).
  • Use high-quality DMX cables with an impedance of 110 Ohms.
  • Apply galvanic isolation on all branches.
  • Route power and signal through separate paths. ⚠️

Opinion of the Sundrax Engineer 💬

The most common mistake in large projects is attempting to connect 70 fixtures to a single line. This almost always results in unstable operation. With proper distribution through DMX splitters and repeaters, the network operates reliably and is managed without issues. ✅

If you are designing a large installation — whether architectural, stage, or show — Sundrax engineers will help calculate the signal distribution scheme and select the necessary equipment. 

🌐 Request a consultation: Contact Us

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