Guitar String Tension
Many people assume and/or confuse a string’s “slinkiness” (aka: compliance) as being the same as tension, which is a big source of confusion and folklore on the Internet especially.
Thoughts like; “These are really slinky strings. They must be really low tension”, are a gross generalization, but would be totally right if referring to compliance only. When someone says “travel” in reverence to string bending, that’s a pretty good word to describe how compliant a string is too.
Being clearer still; it’s not gauge that determines tension. Technically, it’s the mass of the string itself in a plain wire, or in a wrapped string, it’s the mass of the core wire, which is generally thicker in a heavier gauge, but not always. This is the reason why it is possible to make a low tension bass string. Core wires of the same composite mass, have identical tensions regardless of shape. That is fact - Not opinion. It’s the core wire that is held under tension and brings the string to pitch - Not the outer wrap. If you debate this, try this: Pull on the outer wrap of a string. It will unravel!
What Is The Definitive Way To Determine Tension On Strings?
Measure end to end on a cable meter that will gauge it with the string strung to pitch and to scale length. This is something that is largely privy to industrial engineering, not guitarists. If you attempt to measure tension on a strung guitar by using a meter that pulls laterally on a string, you are getting a very biased reading due to compliance, or a string’s lack of compliance.
Everything else being equal, two major factors that bias that reading are as follows:
1. String Compliance - If you bend a less compliant string (i.e. hex core wire, or an outer wrap) it’s going to skew the measurement.
2. Leverage - It gets easier to bend a string as you approach the mid-point of the fretboard’s length. As mentioned above; “Travel”.
In plain wire, it’s simply the gauge, but a wrapped string is inherently stiffer (less compliant) then a plain string of the same gauge. Round wound wrap is more compliant than flat wound wrap because of the tightness of the spacing of the wrap in flat wounds, which while making the string smoother to the touch, is actually increasing the rigidity of the string, while round wound strings generally have less outer wrap on the string core and are more compliant.
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