Basically there really only is once difference between the two as far as I've been able to tell after listening for a while. The bass is even tighter on the Mark II, just a bit more resolution to it. But the original 507uX never really suffered in that department, so it's a minor improvement.
At 3600 bucks, brand new from Mike Rose as advertised here on Audiogon, the unit is a steal. You will not find a better sounding integrated for anywhere near this price unless you want to deal with tubes, then I'd get the Audio Research VSI75 which can be had around the 4000 range. Believe it or not, the bass is as tight on my Aerial 7Ts beeing driven by AR VSI75/REF75/VT80 as it is driven by Luxman. Where I feel it AR gear is superior to Luxman is 3D holographic soundstage. Not that the Luxman soundstage is flat by any means, but driven by a Chord DAC, AR VSI75 is just sublime.
Fun thing to do with your Luxman, being it has PreAmp out and AmpIn, is to stick a tube buffer between, like ifi iTube 2. It's subtle, but you get a bit of tube magic without the pain the ass of large tubes.
At 3600 bucks, brand new from Mike Rose as advertised here on Audiogon, the unit is a steal. You will not find a better sounding integrated for anywhere near this price unless you want to deal with tubes, then I'd get the Audio Research VSI75 which can be had around the 4000 range. Believe it or not, the bass is as tight on my Aerial 7Ts beeing driven by AR VSI75/REF75/VT80 as it is driven by Luxman. Where I feel it AR gear is superior to Luxman is 3D holographic soundstage. Not that the Luxman soundstage is flat by any means, but driven by a Chord DAC, AR VSI75 is just sublime.
Fun thing to do with your Luxman, being it has PreAmp out and AmpIn, is to stick a tube buffer between, like ifi iTube 2. It's subtle, but you get a bit of tube magic without the pain the ass of large tubes.