Brown noise
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0Brown noise
Brown Noise (also called red or Brownian noise) is synthesised noise whose power decreases with frequency by 6 dB per octave, twice as steep as pink. Energy is shifted strongly to the low end, and the sound feels deep and visceral, somewhere between a muffled waterfall and a heavy engine drone. The name comes not from a colour but from Robert Brown; the term refers to Brownian motion, whose mathematical formalism describes this spectral shape.
Psychoacoustically, brown noise is the softest of the standard noise references for most listeners. High frequencies are suppressed, which is particularly valuable for people with hyperacusis, with ADHD (Söderlund et al., Journal of Child Psychology and Psychiatry, 2007), or with high-frequency tinnitus. Forced-choice research by Helfter and colleagues (Frontiers in Psychology, 2020) showed that among the three standard noises (white, pink, brown) most participants preferred brown for long-form background, especially at night.
Use this track for sleep (especially for hypersensitive listeners), for long focused-work backdrops such as programming or accounting, to mask neighbours whose noise sits in the low end (conversations from the room below, for instance), for tinnitus, and for breath-focused meditation. Pairs with Pink Noise, Deep Underwater and Air Conditioner. One of the best sleep tracks in the collection.
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ReduxSound v1.0.0
Ambient sound mixer for relaxation and focus