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哇,这么清楚啊,标准是多少呢?看看下面这段话,虽然不是指弦距,但是能够帮我们更深地认识一下琴颈
Neck relief is, I believe, a very misunderstood aspect of guitar setup. How many times have you heard these statements: "Action’s too low? Just give it some neck relief", "Bluegrass players need some neck relief", "Action’s too high? Reduce the neck relief". Let’s examine some of these statements, but first let’s define "neck relief". Relief describes the bow of the neck. A guitar neck is typically not perfectly straight, but has a dip about mid-way- this is relief. I measure it by putting a capo on the 1st fret, holding down the string on the fret where the neck meets the body- thus creating a straightedge with the string- and measuring the gap between the bottom of the low E and the 7th fret. I use feeler gauges (.002" - .025", stacked for thicker measurements) under good lighting to do the actual measuring. I use the 7th fret just for consistency and because if you hold the string at the 14th fret (as with most acoustic guitars), the 7th fret is halfway. On electric guitars, you’ll be holding down the 17th fret or thereabouts, but most of the neck bow still occurs around the 5th-7th frets. Another term we should define right now is "action"- this is simply the clearance between the bottom of a string and a fret. A high action means you have to push the string down farther to contact the fret than on on a low action
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