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HoRNet ELM128 MK2

LUFS Meter Plugin by HoRNet
HoRNet ELM128 MK2
HoRNet ELM128 MK2 by HoRNet is a Virtual Effect Audio Plugin for macOS and Windows. It functions as a VST Plugin, an Audio Units Plugin, a VST 3 Plugin and an AAX Plugin.
Windows Vista and later
macOS 10.7 and later
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HoRNet ELM 128 MK2 is a metering plugin that complies with the EBU R128 standard. The plugin provides five different loudness measurement: momentary, short-term, integrated, dynamic range and true peak.

The plugin supports mono, stereo and 5.1 surround metering with a handy history graph that you can use to see the loudness of your signals up to 12 hours earlier.

This new kind of loudness metering comes from broadcasting and aims to reduce the difference in the perceived levels of different programs, to help with this task HoRNet ELM128 MK2 also provides a normalization function that adjusts the gain in realtime so that no signal exceeds the reference set by you, the normalization can work using any of the loudness reading of the EBU R128 standard (momentary, short term and integrated).

This meter uses LUFS as measurement units (Loudness Units Full Scale) a LUFS is equivalent to a dB but the difference come from the pre emphasis filter used before any loudness calculation, this filter compensates the non linearities of the human hear do that any measurement takes into account ho we human perceive sounds.

The five meters use different integration times and metering concepts:

  • Momentary: measures the loudness of the last 400ms.
  • Short term: measures the loudness of the last 3s.
  • Integrated: it's the recorded loudness since the beginning of the measurement (or from the last reset operation) but discarding the longest silence parts or the highest passages that may occur in a long program (a movie, a TV show, etc.).
  • Range: is the loudness range of the program in LU.
  • True Peak: this meter shows the maximum level of the signal in dBFS using a 4x oversampling (below 192kHz sampling frequency) to faithfully represent the inter-sample peaks.


  • EBU R128 compliance.
  • Mono, stereo and 5.1 support.
  • Momentary, Short Term, Integrated loudness metering.
  • Loudness range display.
  • True Peak display.
  • True Peak meters.
  • History chart with selectable time and dB range.
  • Realtime normalization to the reference level using any of the available loudness measure.
  • Resizable interface.
  • Load and Save custom presets.
  • Mac OS X (10.7 and later) and Windows (Vista and later) support.
  • 64-bit compatibility both on Mac and Windows.
  • Audio Units VST2.4, VST3 and AAX format.

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