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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: