Pic shows the old style planar mid ribbon, but yours has the dual tweet/mid AMT unit?
I'm looking forward to hearing the AMTs for the first time at CAF this July. The Whispers I heard there last summer had the best bass I have yet heard. One track had a baritone blues singer singing with his guitar, and a tuba accompaniment, playing just a duet. I think it was one of Bill's own tracks, he said "this is the kind of stuff I listen to..." It was unbelievable how real the bass sounded, blended perfectly with midrange. That huge tuba was IN THE ROOM. One of those rare special listening events. Very rare at an audio show!