“WTF are Loudness Units?” you may ask. Well, they are simply a measure of loudness, just like decibels.
One LU actually is equivalent to one dB. However, an important difference is that Loudness Units are “shaped” according to the human ear’s proclivity to hear certain frequencies more easily than others. Effectively, LUs tend to feel more consistent to our brains than dB will when measuring varying frequency content, and therefore LU meters are preferable to use (compared to, say, RMS meters) for assessing the overall loudness of music.
Below are shown six free LU (aka Loudness Unit) meters, listing features of each. The most important value when matching the loudness of songs is IL (Integrated Loudness), which is the average loudness over the entire course of given time (with very quiet material gated out).
These devices are available as VST effect plugins for any capable VST host (such as Ableton Live, for example).
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