This sounds right up my alley, except for the lower treble, which someone else posted that it's actually higher in the 58x than the 6xx. And that's a real shame, because I'm a huge fan of imaging and soundstage. Going from HD 598 to HD 650 was a step down in soundstage for me. It's unfortunate that the 58x would be an ever bigger step down in that aspect. That's another can I'm considering, the HE-4xx. How does the 4xx, in stock form, compare to the 58x?