1, tuning problem: Martin's chord pitch is caused by inaccurate chord tuning. Guitar strings are not properly adjusted to the standard pitch, so the result is higher chord spacing, which makes playing more laborious.
2. Neck bending: Neck bending will lead to a partial or total increase in chord length, so it is necessary to adjust the neck to correct the problem.
3. Height of the upper and lower bridges: The upper and lower bridges are the parts connecting the head and the body. Improper height setting will lead to high total chord length.
4. Micro-motion: After playing for a long time, the micro-motion of the guitar will move or sink, resulting in an increase in Martin chord distance. Chord distance refers to the distance between the upper chord of the guitar neck and the fingerboard. This distance directly affects the difficulty of guitar playing and the comfort of the player.