Light gauge strings may make the action a little lower, if one replaced mediums without doing any other other adjustments. That would be with medium gauges strings. I have not measured one myself, but I would expect these guitars to come in the middle range, near 2.45 for the low E bass string and 1.86 or so for the high e treble string. The high ‘e’ treble string should measure between 1.59 mm (1/16″) and 1.98 mm (5/64″) at the maximum. The Martin guitar factory considers a low ‘E’ bass string to be within specification if the distance from the 12th fret to the bottom of the low E string is between 2.38 mm (3/32″) minimum, to 2.78 mm (7/64″) maximum. This is particularly true with vintage-style Martins. Martin dreadnoughts with “factory action” tend to have slightly higher action than some other modern guitars. Guitar string height can vary within Martin factory specs. The D-28 Authentic 1941 is by all accounts very comfortable to play. Thank you Kanarat for this very good question. What about the action (guitar string height) of this guitar and playability? How about the action at fret 12th of the sixth and first strings? Thank you.

A Reader Asks about Martin Guitar String Height Specs I’m making a decision to buy a D28 authentic 1941 but some question happen in my mind since this guitar has no adjustable truss rod.

Acoustic guitar nut too high