It's funny you mention Billie Jean-that's a song I always use when I get new equipment because it just sounds ridiculously...GOOD. The bass, the clarity...just the overall quality of the recording is absolutely stellar imo. From the 'Number Ones' album, fwiw.
Are you using the Woo amp for your T1s? As I was doing my research here, it seems that many people loved the combination of the T1s with the Woo gear. On top of that, it's some of the most beautiful gear on the market, in my opinion.
Late last night and into this morning, I couldn' stop listening to the T1s even though it was really getting late. I won't use some of the tired cliches about how I heard details in my music that I had never heard before, but I found myself listening to older music that I NEVER listen to. Some of it just sounded ridiculously good, most notably Michael Jackson's "Billie Jean". On some other tracks, you could even hear aspects of the recording environment caught on the recording. There were a few discs where you could tell that they were recording in an environment where there was some reverberation or an echo type effect present. Almost like how it sounds when you're in a bathroom or some other place where when you sing you can clearly hear your voice echoing in the room as you perform. You can actually hear it in the recording and the details are there in spades.