A Shockingly Straightforward Query

I have been entertaining the idea of buying the Carver amplifiers myself...

I have personally owned a few Carver amplifiers but not his latest tube efforts.  I am also a current Martin Logan (Montis, which was replaced in the line up by your 11As, so very similar) owner.  I think you need to be very careful pairing a tube amplifier with ESL panels.  The impedance mismatch is known to roll off the high end.  When I first got my MLs, I was using Wyred4sound amplification.  I did not particularly care for class D with them.  Just my $.02, but I would be inclined to look elsewhere, especially if you do not have the opportunity to try them first.  The Martin Logans are possibly a little more picky about amplification than other speakers.

Carver warrants tubes for 5 years and stats like the voltage of tube amps, Carver monos is my vote.

I have the Carver Crismon 350 monoblocks.
mac 2600 tube pre with SF Olympica 3s.
Carvers are wonderful. Clear, smooth and detailed. 
I sold my solid state 300x2 two days after getting them. 

Ryan

Since you can't audition either one then the choice is simple: buy the one you can return no questions asked.

If neither one can be returned then the choice is even easier: keep looking.