I'm thinking about getting the HD599, but have a couple of questions that hopefully you guys can help me with. I have the HD598 and love them, but wishing I could get some better sub bass extension and a little more detail/clarity. I'm hearing that these could provide that, but I'm afraid the sound signature might change too much for my liking. Could you tell me how the soundstage on the HD599 compares to the HD598? I've read that it's more closed in sounding, is this true? Also, in the FR I see there's a dip before 2khz that the 598 doesn't have, how does this affect the sound, in terms of clarity/detail? I'd really appreciate any info you could give me.