I must say that after hearing SO much about how "dark" these headphones sound I've been VERY pleased with them. I think its much like how Magnepan speakers may not measure well yet they just simply sound like real music. Maybe the Lyr and the tubes I'm using just work well with the HE-400's...not sure, it sounds pretty impressive/enjoyable to me.
Anyone know how many hours it takes to fully burn these in? It took forever for my K701's.