What's your impressions so far, I could take less 10 minutes with it, unbearably bright to my taste. Reverted back to OEM 1.61.
EDIT: Actually, 1.63 still sounds the best out of the bunch, with the least splashy treble.
So on brightness and treble energy I would rate them as
1.67 > 1.61 > 1.63 (higher ranking means brighter)
1.63 to my ears sounds the most "analogue", would like to hear what others think.
Edited by Andrew_WOT - 5/30/13 at 11:55am