Two different questions.
Frequency describes cycles per second, expressed in hertz (Hz), and is related to pitch. Sound level is described in decibels (dB). Perceived loudness also depends on factors including frequency, duration and the listening environment. A frequency number alone is not a complete account of the listening experience.
NIDCD explains that decibels use a logarithmic scale. A-weighted levels (dBA) account for the ear’s differing sensitivity across frequencies.
Sources: NIDCD, How Is Sound Measured?; National Park Service, Understanding Sound.
A label is not an outcome.
A track’s named frequency, a product’s marketing description and a measured listener outcome are different kinds of information. This foundation does not establish a therapeutic benefit for a frequency, playlist or device.
For hearing-health guidance, use NIDCD’s sound-level information. This page is an introduction, not a personal exposure assessment.
Questions for the next reading.
- What sound was actually presented and at what measured level?
- How long did the listening last?
- What was compared, and what outcome was measured?
- Does the finding apply to the proposed use?
No sound product or listening program is recommended in this edition.
— First source review and publication of this note.
A dated starting point, not a continuously monitored or systematic review. See the research log.