Converter
loudness level · Psychoacoustics · Modern
phon
approx.
- Record
- M567
- Definition quality
- Approximate
- Conversion mode
- contextual
- Calculator
- Context required
Definition
The phon measures loudness level: tones at different frequencies can have the same phon value when listeners perceive them as equally loud.
History & use
ISO 226 standardizes normal equal-loudness-level contours from 20 Hz to 12.5 kHz for specified listening conditions and young otologically normal listeners.
Modern use
Modern use is context-dependent and varies by region or measurement system.
Sources & evidence
Source tier — · confidence high