Below 40 phon, loudness falls faster than the 10-phon-per-doubling rule predicts

Evidence

Referring back from Figure 4–3, we also must consider the change in the loudness growth function that occurs at low levels. We observe here that the loudness growth function has a steeper slope at low sound levels compared with the slope at the moderate levels. The dotted line on Figure 4–3 shows the predictions for Stevens’ power law, and we observe that for low levels, loudness growth is more rapid than growth at the higher stimulus levels and does not follow Stevens’ power law. It is now well established that the growth of loudness is more rapid at low levels than at moderate ones (Hellman & Zwislocki, 1961). — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 727 (#corroborates, via linked claim)

Increasing sound by 10 dB doubles the loudness. For any dB SPL value above 40, increasing 10 dB doubles the sones. For example, if we increase the decibel level of a sound from 40 to 50 dB SPL, the loudness goes from one sone to two sones, a doubling of loudness. Changing the sound level 50 to 60 dB, the loudness changes from 2 to 4 sones, and so on. Decreasing the sound level by 10 dB also halves the loudness. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 720 (#qualifies, via linked claim)

Categorization

• XREF: connects to: Loudness grows faster at low levels than Stevens’ power law predicts — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 727; A 10 dB increase always doubles perceived loudness above 40 dB — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 720; Perceived loudness doubles with every 10 dB increase, not every 3 dB of intensity.

Related

• Loudness grows faster at low levels than Stevens’ power law predicts (similarity 0.94)
• A 10 dB increase always doubles perceived loudness above 40 dB (similarity 0.92)
• Loudness doubles per 10 phon except below 40 phon where it drops steeply. (similarity 0.91)
• Perceived loudness doubles with every 10 dB increase, not every 3 dB of intensity. (similarity 0.90)
• Doubling perceived loudness requires a 10 dB increase. (similarity 0.89)
• Loudness grows as a power law of intensity, not linearly. (similarity 0.88)
• Loudness grows as a power law of physical intensity so relative changes match (similarity 0.88)
• Loudness depends on more than physical sound intensity alone (similarity 0.86)
• Loudness perception requires a tenfold intensity increase to double (similarity 0.86)
• Loudness growth with intensity requires experimental quantification, not intuition (similarity 0.86)
• Above 10 Hz, loudness grows 10 phon per tenfold rise in repetition rate. (similarity 0.85)
• Low-frequency loudness growth compresses as level rises (similarity 0.85)
• A tenfold intensity increase is perceived as only twice as loud (similarity 0.85)
• Auditory loudness doubles with every 10 dB increase in sinusoid level (similarity 0.84)
• Raising a sound’s loudness shifts its perceived pitch except near 1-2 kHz. (similarity 0.84)

Broader Connections

• Loudness grows faster at low levels than Stevens’ power law predicts #corroborates (0.95) — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 727
• A 10 dB increase always doubles perceived loudness above 40 dB #qualifies (0.80) — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 720
• Perceived loudness doubles with every 10 dB increase, not every 3 dB of intensity. #qualifies (0.75)