Whops looks like a copy and paste error on my part! Thanks for catching that. All except for the last sentence is about the SA5K.
I am doing even more critical listening with the pro 750, now using the RCA out of my Xonar STX and a LD MKV. Quite stunning, to say the least.
The pro 750 scale EXCEPTIONALLY well with a better source and amp. Much more so than my other headphones I would argue, with obviously the exception of an unamped HD 600.
I read a review of the Edition 8 here by a russian fellow whos name I can't recall right now, but he described the Ultrasone approach and sound perfectly. Bass is the foundation of all music, and the Ultrasone do bass like no other. They hold the rest of the spectrum up with more confidence than any other headphone I have heard. They are not afraid to be show you whats in the low end, and they make sure it doesn't mean you cant see the whole picture. No bloating, no muddiness, no cutting out other frequencies, just pure bass bliss.
To comment on the detail and tonality again, I would argue the SA5K is more detailed over all. On the other hand the pro 750 are breaking in, or my brain is, and they do some things that the SA5K can't. Part of this is due to the lack of soundstage on the SA5K, I think. The pro 750 truly give you the feeling you are in the mixing studio with the band playing live on the other side of the glass. Imaging, resolution, or whatever term people want to use to describe lack of congestion in a headphone the pro 750 are the epitome of that term, from what I have heard thusfar anyways. That is based on the headphones I own, however.
So while the speed is slower, the detail a bit lower too (really depends on what aspect you are focusing on, however. Ultra wins some, SA5K wins some, but I would argue SA5K is the more detailed), the presentation and supreme resolution of the music more than make up for any shortcomings. The pro 750 are no slouches, they just aren't as nimble as the SA5K.
I really want to avoid coming off as a fanboy. I love all my headphones, but I am very taken with my Pro 750. They are closed headphones from a lesser known manufacturer. Nothing would have lead me to believe they would be anywhere near this good. I was so skeptical at first I didn't even want to open them in case I couldn't return them! I would like to add I am making sure as much as possible that my observations are objective. So trying to put sound before personal preference, as hard as that is.
I will mention again that these are the only headphones I have found thusfar that truly bring HIFI enjoyment of music genres such as hard rock, metal, and all variants of said genres. These are by no means a "rock can" just with dueling guitars, soloing drums and such things can get crowded, and these do not dissapoint, or in any other genre. I dare anyone to tell my they have heard "Follow the Reaper" sound better on another headphone!
If anyone wants a comparison to any of my headphones vs pro 750 in a given category, give me a shout. I will see what I can do.
Take peoples opinions with a grain of salt.. You heard about the hate the 750 has. How 'awful' they are.. Only you can really decide. If I listened to people I would never have bought the SA5000, cause it 'has no bass', 'un listenable', 'thin', yada, yada, yada..