[mattg3]

My ksc75 really opened up after 100 hours burn in.My hd555 needed over 300 hours to show a slight difference.I have a new dt990 on the way and wondered from users what is optimal burn in time for this phone before
I evaluate it? thanks Matt

 

[arielext]

don' t know if mine are fully burned in yet but the harsness of the treble is surely less after 50+ hours.

 

[E.B.M.Head]

The last sonical change I noticed was around 120 hours.