White Noise vs. Brown Noise vs. Pink Noise vs. Green Noise: Which Frequency Works Best?
Direct Acoustic Guide: Colored noises are categorized by how their acoustic power changes across octaves. Brown Noise (-6 dB/octave) concentrates energy in the deep 20–250 Hz sub-bass band, creating a soothing thunder-like rumble that quiets internal mental chatter and boosts executive focus. Pink Noise (-3 dB/octave) mirrors steady rainfall and supports slow-wave sleep and memory retention. 500Hz Green Noise isolates the mid-range frequency of flowing water and nature, while White Noise (0 dB/octave) and Psychoacoustic Grey Noise provide an even full-spectrum acoustic curtain against traffic, neighbors, and tinnitus.
🎯 Quick Matcher: Find Your Ideal Noise Color
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Acoustic Spectrum Reference Table
| Noise Color | Spectral Slope | Dominant Band | Natural Analogy & Best Use |
|---|---|---|---|
| Brown (Red) Noise | -6 dB / octave | 20 – 300 Hz | Heavy waterfall, distant thunder; deep concentration & calm |
| Pink Noise | -3 dB / octave | 100 – 2,500 Hz | Steady summer rain, rustling leaves; deep slow-wave sleep |
| Green Noise | Bandpass Q=1.4 | 350 – 750 Hz | Mountain stream, forest canopy; stress & tension release |
| White Noise | 0 dB / octave | 20 – 20,000 Hz | Air conditioner, radio static; masking speech & loud noises |
| Grey Noise | ISO 226 Curve | Psychoacoustic | Equal-loudness balanced spectrum; ear comfort & tinnitus |
| Velvet Dark | -9 dB / octave | 18 – 180 Hz | Ultra-deep cabin hum; zero high-frequency hiss for sleep |
Frequently Asked Questions
Why does Brown Noise feel so calming for busy minds?
By attenuating harsh high frequencies by 6 decibels per octave, brown noise eliminates auditory startle triggers while providing a warm, predictable low-frequency anchor that helps the prefrontal cortex sustain attention.
Is it safe to play Pink or Brown Noise all night while sleeping?
Yes. Keeping the volume at a comfortable conversational background level (around 45 to 55 dB) masks sudden doorway or street sounds without straining your hearing.
Does this sound generator use pre-recorded loops that repeat?
No. AuraWave synthesizes every noise color mathematically in real time at 48kHz using Web Audio DSP filters, meaning there are zero repeating seams, zero audio gaps, and zero buffering.