|Here is your basic dreadnought.
14 frets clear of the body, usually a 24.9" or more often a 25.4" scale—we know these beasts well.
The distance from the nut to the center of the 12th fret defines half its scale.
Double that distance, and you have the full scale—the idealized vibrating string length.
The length of that scale, not to
mention the bridge location,
is completely arbitrary.
|If you shorten the neck, but keep the
bridge in the same
place, you have to compress the scale:
Look where the octave is now. It's as
though you took
the original guitar (at left) and removed a length of
the board between the nut and
the second fret. Ultimate, irreversible
|Same body, same everything, but
14 frets clear 12 frets clear 8 frets clear