Yes, LadyDi is correct. Pink noise is less harsh, more flat and even than white noise. In a nutshell, both contain the full spectrum of frequencies from 20hz to 20000hz that we humans can hear. In white noise, the spread of the signal is even. In Pink, it starts out with more signal power in the lower frequencies and lessens as you go higher in the spectrum. It is the preferred treatment for people suffering from Hyperacusis. Pink noise is also said to be better for sleeping with.