How to Level the Volume on a TV When the Commercials Come ...
https://www.techwalla.com/articles/how-to-level-the-volume-on-a-tv-when-the-commercials-come-on
Even if commercials are playing at the same decibel level as quiet drama, the drama's sound mix likely puts environmental sounds in the back and dialogue up front. A commercial, on the other hand, often mixes everything at the same level, making for a jarring, dissonant effect. That's where TV sound regulators come in.
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