I upgraded from Ultra MM1 to Ultra MM2. It seems the music has more clarity and transparency.
Funny thing - At first I thought it was awful, but then noticed that the settings on my Marantz SA7S1 CD player were changed. I must have accidentally switched them. When I changed them back, the sound was awesome. So there is a difference. With MM1 I didn't notice the filters on my CD player were set incorrectly.
I would upgrade again, if I was given the choice today.
Funny thing - At first I thought it was awful, but then noticed that the settings on my Marantz SA7S1 CD player were changed. I must have accidentally switched them. When I changed them back, the sound was awesome. So there is a difference. With MM1 I didn't notice the filters on my CD player were set incorrectly.
I would upgrade again, if I was given the choice today.