Top rated portable sound machines wholesale factory: Consider the ‘color’ of the noise too, as different profiles handle frequencies differently: White Noise: Offers equal power across all audible frequencies. It’s the most well-known type. Pink Noise: Has reduced energy in higher frequencies compared to white noise. Many people find it sounds “flatter,” more balanced, or like gentle rain. It can be particularly good at masking lower-pitched human voices. Brown Noise: Features even more energy biased towards the lowest frequencies. It sounds deeper, perhaps like strong surf or a heavy downpour. Very effective for some masking needs, but might feel too …