What Should the Action be on an Acoustic Guitar. E String (6) height at 12th fret 2.00 mm (0,079’’) There is an annoying buzz on the B string from fret 1 – 3. To lower the action on an acoustic guitar, ... E String (1) height at 12th fret 1.4 mm (0.055’’) 2. String height at the nut should be as low as possible without causing open string buzz. Unlike electric guitars, any buzzing due to low action is obvious on an acoustic guitar. High action on an acoustic guitar not only affects the intonation, it can make the instrument difficult, if not painful, to play. String Height At The Nut. Whenever I play an attaching D Chord, it is pretty loud. A typical action on an acoustic guitar is at around 5/64″ (2.0mm) on the high E string and 7/64″ (2.8mm) on the low E string. A guitar’s action is defined principally in terms of the height at which the strings sit above a given fret. The distance between the string and the 1st fret would nearly always be below .020 (.5 mm). Experts differ in their opinions about which fret is best to measure string height from, with most saying that measuring from between the 8th and the 12th fret, is the best. This is why acoustic guitars usually have higher action than electric guitars.