Corrections

Every substantive correction is recorded here, with the date and what changed.

Why this matters more in this subject

The material here touches health, and somebody may decide whether to protect their hearing on the basis of a figure on this site.

A wrong number here is not an embarrassment; it is a decision made badly by somebody else.

What counts

Logged: a misstated level or limit, a figure attributed to the wrong source type, a mechanism described wrongly, a calculation error, or advice reversed.

Not logged: typographical fixes and clarified wording that does not change meaning.

The correction most worth sending

A figure labelled as one source type that came from another.

The labelling is the rule this site would be least defensible without, and one wrong label undermines every other figure on the page.

If you have a measurement

With the instrument, its calibration, the position and the settings.

Particularly where it contradicts something here. Typical-level figures are the weakest material on this site and a real measurement outranks them.

About the previous use of this domain

This address previously hosted an unrelated single page, which is not reproduced and is not referenced.

If anything on this site appears to reference it, that is an error and it will be removed rather than corrected — the separation is deliberate.

The log

No corrections have been logged yet. This site is new, and an empty log means only that.