Leqm measures decibels averaged over time with a weighting curve that is more sensitive to annoyance frequencies: breaking glass, explosions, and other piercing sounds. This allows for trailers to have loud explosions with enough quiet parts to balance it out so as not to fatigue or annoy the audience.
TASA approved LeqM meters:
- Atmos, 7.1, 5.1, and 2.0: Nugen VisLM2
- 2.0 and 5.1: Nugen VisLM2, Dolby Media Meter, and Dolby DMU