Phon Scale Instant

While both measure loudness, they serve different purposes in audio engineering and psychoacoustics: Phon Scale Sone Scale Logarithmic Purpose Measures loudness levels (matching) Measures relative loudness (how much louder) Reference 40 phons = 40 dB @ 1 kHz 1 sone = 40 phons Scaling Follows the dB scale 2 sones is twice as loud as 1 sone

While physical measurements (like decibels) measure sound pressure intensity, the phon scale measures how loud that sound actually sounds to the human ear, accounting for the fact that our ears are not equally sensitive to all frequencies. phon scale

However, as you move away from 1,000 Hz to higher or lower pitches, the relationship between phons and decibels changes. While both measure loudness, they serve different purposes

While the phon scale is widely used, it has some limitations: We are most sensitive to frequencies between ,

Human hearing is not equally sensitive to all frequencies. We are most sensitive to frequencies between , which roughly corresponds to the frequency range of human speech. Conversely, we are much less sensitive to very low and very high frequencies.

: To hear a 50 Hz tone as loudly as a 1 kHz tone at 40 dB, the 50 Hz tone must be played at a much higher physical intensity (roughly 70–80 dB SPL).