Acknowledged with thanks, James. Do you mention the relative efficiency and power requirement because that correlates to a fully articulate sound at relatively quiet SPLs? It may be so, I never made that connection, claiming no technical expertise.
I have noticed that some speakers, such as the ATC SCM 11s must be played fairly loudly before you feel you are getting all the musical information. Others, such as the Harbeth Compact 7, can be played quite softly, and you still feel you are still hearing all of the tone and detail.
That is what I was trying to get at with my question about the Compact Ts. You may already have addressed that implicitly, if so, please pardon me.