Most engineers today are used to approximating loudness using Root Mean Square (RMS), which a measure of average loudness using math that you probably don’t want to know about. Mastering professionals though prefer Loudness Unit (LU) metering tools. Here are the best 6 metering tools, according to MusicTech, that you can use to measure loudness. And you don’t even have to be a mastering engineer to use them:).
One of their choices is Insight by iZotope. It’s one of the most comprehensive tools available in the market today. It has a wide range of loudness meters available. The “meter tap” allows comparison of channels.
LM1n by TC Electronics is another choice. It’s the simplest of TC Electronics line of metering tools
Read more about it here: http://www.musictech.net/2016/10/loudness-meters/
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