Sorry to derail the 3.Ai and 4.Ai talk, but I have to share this.
I'm at work right now, where most of my listening takes place. I'm reading up on Windows Powershell and I figured Keith Jarrett's marvelous Köln concert would be a brilliant audio backdrop for my studies, using my DX100 to power the Heir 8.A. I was not prepared for what followed.
I expected the concert to just flow in the background, allowing me to focus on my reading. I know the recording well and it is very enjoyable, yet unobtrusive. However, on the 8.A it was something completely different. I know that there's a couple of coughs from the audience during the concert but suddenly I heard more of them, coming from different places in the concert hall. People moving in their seats and the little sounds from Keith losing himself in the music - small, joyous exclamations, sighs and moans. So, the 8.A conveys detail really well. We know this. What really amazes me, however, is that I hear zero noises from the recording equipment. Nothing. Not a blip, not a hum, no static, nothing. Keep in mind that this was a live recording in a concert hall, in 1975. I'm listening to the 24/96 version from HDtracks in FLAC but I'm not hearing a recording. It really sounds like I have not only flown back to January 24th, 1975 - I am hovering about 1-2 feet above the piano, facing Keith Jarrett. Simply amazing.
Sorry boss, I'll need to finish this concert, then I'll get right back to reading.