Sorry guys, but I'm disappointed with the sig DJ. It isn't burnt in yet but I doubt it is a night an day difference. It maybe underpowered but I ain't sure, using a p4 warbler with iPhone 4S. It lacks the warmth of a denon the bass is tight and punchy but slightly ever laid back. It laks te opened of a hd650 oh well. Seems like in gonna get the d7k
EDIT: The sound quality is great, but it isn't to my sonic signature.
Yeah, based on their response I was worried the peak (i think it was between 3-4khz) to make them sound a bit hard. However, I like darker headphones too.