glossary
The RMS window decides how quickly an RMS meter reacts to level changes.
An RMS window is the time span used to calculate average signal power. A shorter window reacts more quickly, while a longer window smooths fast changes into a steadier reading.
Two RMS meters can show different values on the same audio if their window lengths are different.
Short windows make drums, syllables, and transient-heavy parts easier to see. Long windows are better for judging sustained level but can hide brief jumps.
RMS is not the same as LUFS because LUFS includes weighting and loudness-gating behavior designed around perceived loudness.
Use RMS when you need an energy-based level reference, and use LUFS when delivery loudness or perceived program level matters. Avoid comparing RMS readings unless the meter settings match.
Meter Core keeps multiple level views available so you can separate sustained energy from delivery loudness.