What brown noise is
Brown noise loses 6 decibels of power for every octave it rises, twice as steep a fall as pink noise. The highs almost disappear and the lows carry nearly everything, which is why it sounds like a rumble rather than a hiss.
It is named after Robert Brown and Brownian motion, the random drift it mathematically resembles, not after the colour. You will also see it called red noise.
Lalai’s brown noise is generated, not recorded, and built to loop with no seam. It is one of the free sounds in the app.
| Made by | Synthesised for Lalai |
|---|---|
| Rights | Owned by Lalai; no third-party material |
| Here | A 20-second loop, crossfaded so it turns without a seam |
| In Lalai | Free |
The colours of noise, side by side
Noise colours describe how a sound’s power is spread from low frequencies to high. Each of these plays free on its own page.
| Colour | How its power is spread | What it sounds like |
|---|---|---|
| White | Even power at every frequency | A bright, even hiss, like an untuned radio |
| Pink | Falls 3 dB per octave, so every octave carries equal power | A softer, fuller hiss, close to steady rain |
| Brown (this page) | Falls 6 dB per octave, so the low end dominates | A deep rumble, like a waterfall heard from a distance |
| Green | Pink noise with a broad lift centred near 500 Hz | A rounded, middle-weighted wash, like distant surf |
Pair it with
In the app you can layer up to five sounds and set each one’s level. These go well with brown noise:
- Rain on a window. Rain on top of brown noise: high and low together.
- An open fire. A fire over a deep, steady bed.
- Green noise. Less bass, more middle, for a lighter sound.
All night, with the screen off
A browser tab usually stops playing when your phone locks or the tab goes to sleep. In the Lalai app, brown noise keeps playing with the screen off and fades out on the timer. You can layer up to five sounds, put slow original music underneath, and keep everything on your phone for nights with no signal.
Brown noise is free in Lalai. No trial, no card and no account: it’s one of the free sounds, alongside the mixer and the sleep timer. No ads, no account, no analytics.
Listening safely
- Start low. Set your device volume low before you press play, and turn it up only as far as you need. The loops here are mastered quietly on purpose.
- Not too close. A phone on the bedside table is closer to your ear than it seems. Avoid falling asleep in earphones at volume.
- Use the timer. It fades the sound out rather than stopping it dead, so the quiet arrives gradually.
Lalai is for relaxation and enjoyment. We don’t claim that this or any sound changes how you sleep, and if poor sleep goes on for weeks, please see a doctor. More on protecting your hearing.
