White noise

No unless you overdrive the signal. You may even notice after playing for an hour or so an improvement in the sound from your speakers. I use a full sweep 10hz - 20khz cd buried in the white and pink noise. In my system the change is very minor.

i saw both in concert and i doubt they will harm your gear.

So, according to sample from this WS, freq from pink noise is lower than white noise? Raise the bar for higher,lower volume.
http://simplynoise.com/

...and the brown noise is even lower freq !!!

Let's not forget 'black' noise,
which can be played as loud as you want!

(this is supposed to be funny ;-)