If the jergpad mod tames the treble further along with improving its mid-range to being on-par-ish with the Mad Dogs and improving its comfort then I think I definitely found my new headphone :). Open vs closed is not so much of a preference but I do think I like open more overall.
The HE-400 will always have elevated, slightly high pitched treble. No mod can counter that.
If you really don't like the treble now, you should probably ask for a refund. Other than the elevated treble, I think the HE-400 is slightly better overal than the maddogs.
Edit: that last sentence didn't say anything, what I meant was that the sound of the HE-400 is slightly better than the maddogs, even with the elevated treble (IMO).
Edited by Marleybob217 - 3/22/13 at 3:54pm