There's no depth on Portapro pads though, so the cups can't sink that far. In comparison to the PX100, the Portas actually seem more extended in the treble. The difference between old and new was really large as well
The 681's have a piercing treble that I have a passive filter for but they also 'ring' like a bell. The smooths out the top end for me. However, they developed bass over a half hour period.
Edited by iancraig10 - 7/4/13 at 6:19am