# What is grey noise?

https://hushmachine.com/sounds/grey-noise · Free; shaped to an equal-loudness curve · Kallos Labs

> Grey noise is random sound shaped by an equal-loudness curve, so that it sounds equally loud at every pitch to the human ear. The ear is less sensitive to very low and very high sounds, so grey noise turns those up; it sounds flatter and more even than white noise.

## What it sounds like

Tuned to sound equally loud at every pitch to the human ear.

## How Hush Machine makes it

Hush Machine shapes live white noise with the inverse of an equal-loudness curve.

## How people use it

- An even background when white noise sounds too hissy and pink too dark.
- Comparing how a sound feels across the whole range of hearing.

## Questions

### How is grey noise different from white noise?

White noise has equal power at every frequency. Grey noise is adjusted to how hearing works, so it sounds equally loud at every frequency instead.