McIntosh autoformers vs direct-coupled output

With much respect for the technical discussion, I'd like to get back to the focused point of my inquiry:  Mac Autoformer amps vs Mac Direct Coupled.
I'm contemplating acquiring a pair of Martin Logans, and I'm hearing
 that these bi-polars prefer Direct-Coupled, that the Autoformers
have some difficulty in the mid-base region - just about the low end
of the M.L.'s panel's low end. 
Is this just another of those opinions masking subjective bias, or is there techical substance here?
Any help on this issue will be greatly appreciated!
Bo

Viridian:
"Don't all opinions mask subjective bias"?
Of course! Sorry. I might have simply asked for factual technical info to
help me determine a direction.
Georgehifi: M.L. #3 - powered woofer.
To all: I accept the notion(s) that there are better amp choices
available, but I have a limited budget and have a DeWick re-built C-37
which offers the low-level sound shaping I require.  Unless there there is a compelling cost/performance disparity, I'd prefer to continue with a
Mac amp. Now, given my answer to George, what Mac amp - Auto,
or direct, and what power - would be the most suitable, least
compromising pick? 
Most appreciative of your input - all of you!
Bo

Thanks to all!  Ziggy: what are M.L. 11A's?  I'm looking at a pair of
Expressions (powered bass).