In a nutshell, pink noise is distributed such that the same amount of energy is in the space from 100-200 Hz as in the space 10000-20000 Hz, whereas white noise has constant density, such that the same energy is present from 100-200 as from 10000-10100.

If I understand correctly:

The issue with high gain amps/speakers is that if (as was the case with the 950) the noise floor is a fixed level and the gain from the pre-out to ear is high, this noise floor will rise to an annoying level even though the gain is turned down. Any adjustment in that chain (amp gain for instance) can be used to bandaid it, but the new revision sounds like it's correctly implemented.