Apparating/ Disapparating

[phluxist]

No: HPFGUIDX 79477

Theres something that has been bothering me about the series ever 
since CoS, and the errors seem to keep surfacing in OotP, too.

Whenever JKR describes someone apparating/disapparating, she always 
remarks that there is a loud popping or cracking noise. Even Dobby, 
who can perform his own type of apparation (unlike wizard apparation 
because it obviously is not effected by preventive charms such like 
those at Hogwarts)is described accompanied with a loud noise. 
However, there seem to be many times where JKR describes 
people 'disappearing' but without a sound. Are we to believe that 
these *stealth* disappearences are not related to apparation? Or 
perhaps some wizards have mastered the ability to apparate/ 
disapparate without making a noise?

It sounds like there are a lot of people in the WW can quietly 
disappear without drawing attention...

Whats the deal?

-Phluxist