MAC Autoformers?

The only negative with Mac autoformers is in doubling the amplifier cost and weight.

I have been looking at integrated amps and when researching the Mac I noticed the only ones without auotformers are the lowest rated at 100w. I wonder why that would be the case are they not needed in the low watt amps? I assume they could use them just as easy in a 100w integrated as a 200w integrated. I belive they use the autoformer in all the new power amps even the lowest 150w mc152. I don't own one or know  that much about it just curious why only the low watt amps don't have them ? Could it be they are meant to be used in smaller rooms with easier to drive speakers? 

" The only negative with Mac autoformers is in doubling the amplifier cost and weight"

So true!  I had to get help from my neighbor to get the carton from my car into the house, get the beast unboxed, unbolted from the plywood base, and lifted up onto my wall unit!

"I have been looking at integrated amps and when researching the Mac I noticed the only ones without auotformers are the lowest rated at 100w. I wonder why that would be the case are they not needed in the low watt amps? I assume they could use them just as easy in a 100w integrated as a 200w integrated.

My guess is that this is strictly a marketing issue, by not including autoformers in low power amp they are offering entry level Mac products  for those who do not need big power, big weight and big price tag but still like to own a McIntosh.

After owning a newer solid state amp from McIntosh with autoformers, I have come to believe it is their attempt to have the amp take on some of the characteristics of a tube amp. This myself was confirmed that the bass produced was loose and did not have the impact/slam of a Direct Coupled amp. Further I felt the midrange was more on par with a tube amp in that it was full and fleshed out.