🌊 Brown Noise Generator

Generate a low-frequency rumble and compare its sound with white and pink noise. No signup.

Volume50%

What is Brown Noise?

Brown noise (Brownian noise) rolls off at −6 dB/octave. Sounds like a deep rumble, waterfall, or thunder — emphasizes low frequencies.

The Science of Brown Noise

Brown noise — also called Brownian noise or red noise — is named after Brownian motion, the random movement of particles. Its power drops steeply by 6 dB per octave, so almost all of its energy sits in the low frequencies. That gives it a deep, rumbling, thunder-like character.

Because it concentrates energy in the bass range, brown noise is gentler on ears sensitive to high frequencies and is popular for deep focus and relaxation. It is also a demanding signal for subwoofers and full-range speakers, since only capable systems can reproduce its lowest components cleanly.

Common Uses

•Compare bass reproduction
•Background sound
•Personal listening preference
•Subwoofer testing
•Low-frequency masking

Compare Noise Types

White = all frequencies equal | Pink = balanced, natural | Brown = deep, low-heavy

White Noise Generator Pink Noise Generator Brown Noise Generator

Check a bass-heavy noise without overdriving small speakers

The generator accumulates and filters random samples to emphasize low frequencies. Its locally generated two-second buffer repeats while playback is active.

A repeatable check

Lower both volume controls before Play. Listen for a soft rumble rather than trying to make it as bright as white noise.
Keep the level modest when using phone or laptop speakers, which may reproduce only part of the low-frequency signal.
If you hear a rattle, stop and use individual bass-test tones to determine whether it repeats at a particular frequency.

What the result suggests

It sounds weak on a phone but full on larger speakers: The different playback systems reproduce different portions of the spectrum. This alone does not show that either device is defective.
The rumble causes buzzing or breakup: Reduce the level, check nearby vibrating objects, and retest briefly. Do not compensate for missing deep bass by increasing output further.

What this cannot establish

The sound is not a calibrated subwoofer test or a dedicated LFE signal. A darker timbre does not establish a safe listening level or a benefit for sleep, anxiety, or attention.

Testing methods and limitations

Enable JavaScript to play sounds and use the microphone. You can still read this page’s instructions, result explanations, and frequently asked questions.

Frequently Asked Questions

Why does brown noise sound bass-heavy?

Its power spectral density falls approximately 6 dB per octave, emphasizing low frequencies. The generator uses a filtered random buffer; small speakers may reproduce little of its bass.

Why do I hear a rattle?

Stop or lower playback first. Check nearby objects and compare at the same volume after moving one object or the speaker. A rattle alone does not identify a failed driver.

Does this treat anxiety or ADHD?

No treatment is provided or demonstrated by this tool. It generates a sound that some listeners may prefer as background audio. Do not treat a sound preference as evidence of a health benefit.