Sone 363 «8K 2026»

A turbofan engine at takeoff thrust produces approximately 140 dB near the inlet. That is roughly 1,000 sones. At idle reverse thrust, you might see levels around 120–125 dB – or 363 sones. Ground crews must wear dual hearing protection (earplugs + earmuffs) at this threshold.

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In architectural acoustics, large spaces like concert halls, cinemas, or sports arenas require sound system calibration. A specification like "max 363 sones" might refer to the total perceived loudness at full occupancy across a distributed speaker array. A turbofan engine at takeoff thrust produces approximately

Consider:

A: The sone is already a perceptual unit. For physical sound power, the bel (and decibel) is standard. For perceived loudness, multiple sones are simply additive – 400 sones is louder than 200 sones. Ground crews must wear dual hearing protection (earplugs