String size
General mountain dulcimer or music discussions
Ken, another size of strings, with the same length and pitch, needs a different tension, which will result in another building-up of overtones, which one can clearly hear, even at an old age ;-) Designing strings is a difficult job. Designing an instrument too. Lets take a look at the piano. If the bass strings weren't different in size with the others, an octave lower would mean a string twice as long. Even the grand piano would be too small. These strings are designed to sound at a special pitch with a special volume. The length is (almost) fixed. When changing the pitch of the string, mostly higher (an A into a D on the dulcimer), the tension of string is changed, also higher, which enable the string to produce higher overtones. The string will sound slightly different... In the piano the sizes differ to get the same building of overtones all over the strings, because the tension is almost the same.
The human ear is the best instrument to measure this. There are musicians, who has no prefect hearing, but are able to hear a music piece is played in 432 Hz or in 440 Hz. I am able to detect a 'false' sized string on a guitar. The dulcimer is harder, simple because the instrument is played in a different style.
updated by @wout-blommers: 09/01/15 06:53:22PM