I believe this is the Cullen modification; lots of discussion about that modification here. I'm a fan. What's new, I believe, is the I²S output, which I would love to learn more about too.
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If you cannot do it yourself or know someone who can do this for you then you are probably paying to much fo rthe modifications. Not all modifications made a significant difference. I have a friend who spent close to $4K from a recognized mod company and it was not worth it. Better yes but not to the level he wanted.
I just got mine back fron Wyred for Sound. It was set at 24/96. The sound is very open, crystal clear and as detailed as anythiing I have ever heard. I am playing it on a new Peachtree IDAC with Cardas high speed cable. I have about 3 hours of play on all. The only thing it lacks is warmth. I am hoping with break in it will warm up.