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 . Ground crews must wear dual hearing protection (earplugs + earmuffs) at this threshold.
To visualize this:
In a world where memories could be extracted from one's mind and stored in crystalline structures known as "memory stones," the city of New Eden was the epicenter of this revolutionary technology. People could relive their fondest moments, learn new skills, and even share experiences with others by simply holding a memory stone. sone 363
| Sound Source | Typical Sones | dB SPL (approx.) | |--------------|--------------|------------------| | Breathing | 0.1 | 10 | | Quiet library | 1 | 40 | | Normal conversation | 4 | 60 | | Vacuum cleaner | 8 | 70 | | Chainsaw (1 meter) | 64 | 110 | | | 363 | 125 | | Jet takeoff (100m) | 512 | 130 | | Firecracker (1m) | 2048 | 150 | A turbofan engine at takeoff thrust produces approximately
Left hand: low D♭ and A♭ alternating quietly, like a motor. Right hand: repeated G♭ in octaves, barely moving — pppp Ground crews must wear dual hearing protection (earplugs
Online communities (Reddit, Discord, gaming forums) sometimes repurpose technical terms as inside jokes. "Sone 363" could be: