A quick update - with some minor position changes in the room, and a work-around for the prime listener seating position relative to the T-10s, I'm now better able to appreciate what the speakers are capable of.
Imaging, dynamics, transparency and full range, including into the lower bass frequencies, are all there. In a way that is world-class. The T-10s are very revealing of details in the recording, the mix and so on. It's not that they are so analytical as to make mediocre recordings unpleasant, it's more that you can easily hear even subtle differences.
A guitar tech once said to me that some recording engineers would rather track a typical Gibson acoustic guitar compared to a typical Martin, only because the Martin produces more harmonics, requiring more care to place into a mix, mic selection etc. There are recordings where, through the T-10's, you can tell whether the guitar is a Gibson or a Martin. The Model T's in active mode exposed such details as well, but this is a bit like Imax vs. your local theater.
Brian