The Standard Mendocino Double Cut DC is the same size and
sound as the classic Mendocino but with a tulip like double cutaways.
The A version, the DCA, is slightly larger with a more traditional cutaway shape. A is for Anderon. We'll loosly translate this to mean larger. This was created in conjunction with Kid Anderson, sometimes know as "The Mighty Anderon" The acoustic voice of this guitar is roughly 10% louder than the standard Mendocino and has warmer lower midrange creating an even more full range voice.
The DCAF version adds an F-hole that bumps up the lower octave of the acoustic voice giving the low E and A strings more authority and taming the upper mids a little to produce the most uniform acoustic voice of the Mendocino Line. Well, before moving to the Baritone I suppose.