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Grey noise is white noise reshaped so that every pitch sounds about equally loud to a listener, following how sensitive hearing is across the range. It bends rather than slopes, which separates it from pink noise, and there is no single version because hearing changes with volume.
Why white noise sounds bright
White noise has equal power at every frequency, but the ear does not hear it that way. Hearing is most sensitive in the upper middle of the range, roughly 2 to 5 kHz, so white noise seems to push forward there and hiss.
What grey noise changes
Grey noise compensates using an equal-loudness curve, which records how loud different pitches seem at the same power. It adds power where hearing is less sensitive and removes it where hearing is more sensitive.
Those curves change with listening level, so there is no single grey noise. It bends rather than slopes, which is what separates it from pink noise.
Hush's Grey static
Grey static is the brightest of Hush's white noises: between 2 and 12 kHz it rises 5.0 dB per octave, where White static rises 1.6 dB per octave. Hush does not describe it as calibrated to an equal-loudness curve, so treat it as a bright, airy noise rather than a reference grey noise.
Band by band, in numbers
| Band | White static | Grey static | Difference |
|---|---|---|---|
| 2 kHz | −7.8 dB | −15.2 dB | −7.4 dB |
| 2.5 kHz | −7.2 dB | −14.5 dB | −7.3 dB |
| 3 kHz | −6.6 dB | −13.4 dB | −6.8 dB |
| 4 kHz | −5.7 dB | −11.0 dB | −5.3 dB |
| 5 kHz | −4.8 dB | −8.8 dB | −4.0 dB |
| 6 kHz | −4.2 dB | −7.0 dB | −2.8 dB |
| 8 kHz | −3.5 dB | −4.6 dB | −1.1 dB |
| 10 kHz | −3.8 dB | −3.8 dB | 0.0 dB |
| 12 kHz | −4.6 dB | −4.2 dB | +0.4 dB |
