The science · Solfeggio
285 Hz, explained
285 Hz is one of the nine solfeggio values, a set first put forward in the 1970s. Popularly linked with rest, it is a description of what people say about it, not of an effect. In Sonor it is a carrier pitch: it changes the note you hear, not the band.
What the research says
The numbers were derived in the 1970s by Joseph Puleo from a pattern of verse numbers in the Bible's Book of Numbers (Science Feedback, 2022). 285 Hz is not among the six values in the earliest lists, so it is a later addition. The review did not locate who first added it. A fact-check found no scientific or clinical evidence that any solfeggio frequency regenerates the body or removes toxins.
A PubMed search for 285 Hz combined with music, sound, tone, solfeggio, healing or acoustic returned five records. All five are unrelated to listening to a 285 Hz tone.
No peer-reviewed study was located that tested a 285 Hz tone for any effect on people or animals.
How Sonor uses it
285 Hz is a named carrier pitch for the isochronic tone. Choosing it changes the note you hear. The pulse rate, and so the band, stays the same. See What are carrier frequencies? for what a carrier does.
You can hear Sonor's tones on the listen page.