Professional sound unit converter for acoustics, audio engineering, and noise control.
Logarithmic unit for sound pressure level. Reference: 20 μPa (threshold of hearing).
SI unit for sound pressure. Linear scale for acoustic pressure measurements.
Unit of loudness level. Equal-loudness contours at 1 kHz frequency.
Unit of loudness. 1 sone = 40 phon. Doubling sones doubles perceived loudness.
Quietest sound audible to human ear (20 μPa, 1000 Hz).
Quiet whisper at 1 meter distance. Library environment.
Typical conversation at 1 meter. Office environment.
Busy street traffic. Prolonged exposure may be harmful.
Power tools, machinery. Hearing protection recommended.
Live music, nightclub. Hearing damage with short exposure.
Aircraft takeoff at 100m. Pain threshold, immediate damage.
Firearm discharge. Instant hearing damage without protection.
Fletcher-Munson curves showing frequency-dependent hearing sensitivity.
Frequency weighting approximating human hearing sensitivity.
Total acoustic power emitted by a source (dB re 1 pW).
Acoustic power per unit area. Vector quantity with direction.
Time for sound to decay 60 dB in enclosed space.
Speech Transmission Index (0-1 scale) for communication quality.
Reference level for mixing and mastering in professional studios.
THX cinema standard for dialogue reproduction level.
Front-of-house mixing levels for live concerts and events.
EBU R128 loudness standard for television broadcasting.
Spotify, Apple Music loudness normalization target.
Typical professional audio equipment noise floor specification.