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The santur is the oldest branch of the box zither family: a trapezoid wooden box with strings stretched over the soundboard and struck with two light hammers. Not plucked, not bowed — struck.

Its place in the family tree matters: the Middle Eastern santur, the Hungarian cimbalom, the Chinese yangqin, the Indian santoor and the Western hammered dulcimer are all descendants of this one line.

Structure: a trapezoid box, eighteen bridges, seventy-two strings

Four points:

1. An isosceles trapezoid. The wide side is about 90 cm (the player sits there), the narrow side about 35 cm, the box 6–10 cm deep. The taper is not decoration: it makes bass strings longer and treble strings shorter without changing gauges. 2. Eighteen bridges, in two sets of nine. The bridges (*kharak*) look like chessmen and can be slid along the soundboard — moving one changes the string's speaking length, and therefore its pitch. That is the santur's only tuning mechanism besides the pins, and the reason it can produce the quarter-tones of Persian music. 3. Seventy-two strings, four to a note. Four unison strings struck together roughly double volume and sustain — the same idea as the mandolin's courses, except struck instead of plucked. The bass courses are copper- or bronze-wound; the upper ones are steel. 4. Two rosette openings on the soundboard — acoustic openings and ornament at once.

How it sounds: one bridge makes three segments

This is the shared secret of every hammered-dulcimer family, and the most interesting thing about the santur.

A course of four strings is not one pitch from end to end: it crosses two bridges and is therefore divided into three segments, each with a different speaking length — so each segment is a different note. The player strikes whichever segment they want.

Hence few strings, many positions: 72 strings (18 courses) yield 27 positions (25 distinct pitches, since the top note repeats). It also explains why tuning a hammered dulcimer is a craft: you are not only tuning strings, you are placing bridges.

One layer up, the santur's sound has a feature few string instruments share: very long sustain, and sympathetic resonance in the strings around it. Strike one string and the other three in its course, plus every other string at the same pitch, start ringing — so the sound is thick and continuous, close to the way a harp layers up, except the attack is hammered, harder and more definite.

The cost: it is poor at short, sharply separated notes — the tail is too long and fast passages smear. So santur music leans on ornaments, repetition and tremolo (rapid alternation of the two hammers), using density where other instruments use staccato.

Range

这是最常见的九桥 G 调桑图尔的音域（三个音区各跨一个八度多一点）；换成 A 调则整体上移，低音可到 F3、高音到 G6。桑图尔不是移调乐器。

The range divides into three registers, one per group of courses:

The three registers overlap by more than an octave, so a given pitch is often available in two registers — which is exactly the instrument's tone-colour layering device: move a melody to another register and its weight and brightness change.

Note that the lowest octave is incomplete: bridge layout means the bass register only carries some degrees, and a given mode may not be playable down there. That is a real limit — and the reason 12-bridge variants exist: a slightly wider range, but more importantly the ability to hold the notes of several modes at once, so you do not have to retune to change tonic.

Timbre, and how to hear it

Four cues:

1. A hammered attack. Steel strings hit by wooden hammers give a very definite onset with a metallic edge — between plucking (guitar) and striking (piano). 2. Enormous sustain with rich resonance. Strike one note and three more in its course plus distant unisons respond — a single note already sounds like a patch of sound. 3. Registers differ sharply. The bass courses are wound, thick and dark; the upper ones are steel, bright and fine. The same melody in another register sounds like another instrument. 4. Microtones. Persian classical music uses quarter-tones (*koron* down, *sori* up), and the santur obtains them by sliding its bridges. They sit between the piano's black and white keys, and are the most immediate way to recognise Persian music by ear.

The tracks under “Listen in the library” are related box-zither repertoire (nothing in the library can be confirmed as santur music); timbre comes from the player above.

Playing techniques

Everything turns on two light hammers:

• Grip: the *mezrab* are feather-light and held between thumb, index and middle finger — closer to holding a pen than a drumstick. Tips may be bare wood, felt or cotton: harder tips for clarity, softer for atmosphere.
• Alternating strokes: the two hands alternate on one note to make a tremolo — the santur's signature sound, used to sustain long notes (the same survival strategy as the mandolin's tremolo: one note will not hold, so repeat it).
• Hands across registers: bass and treble sit outside the two bridge sets, so the two hands can work in different registers simultaneously, producing two voices. A santur cannot truly hold a chord, but it can build polyphonic lines.
• Ornament: trills, grace notes, glissando-like runs — the core vocabulary of Persian classical music and the densest part of the repertoire.
• No short notes: with such a tail, the player controls blur by damping and by switching registers, rather than by playing staccato.

The family

This branch spread very widely — the santur is effectively the ancestor of struck box zithers:

So "what is a santur?" has a clean answer: it is the closest thing in this family to the prototype — no legs, no pedal, no mechanism, just a box, strings and bridges, with one adjustable variable: where the bridges sit.

History

One name worth singling out: Habib Hasan Touma argued that this Babylonian instrument is the common ancestor of the harp, the Chinese yangqin, the harpsichord, the qanun, the cimbalom and the hammered dulcimers. The details are still debated, but the point stands: "strings lying flat and struck" matters far more than how many strings there are.

Common misconceptions

• "The santur is plucked." It is struck. Two light hammers, not fingers — which is why its attack and sustain differ from a guitar's or a harp's.
• "One course is one note." A course crossing two bridges is cut into three segments, each a different note. That is how 18 courses give 27 positions. The bridges are the core mechanism, not the strings.
• "More strings means more range." With only 72 strings the santur covers over three octaves — because "one string, one note" does not hold here. Compare the harp: 47 strings give six and a half octaves by one note per string plus pedals. Two completely different trade-offs.
• "It is uniquely Iranian." The same branch runs across Eurasia: the Chinese yangqin, the Hungarian cimbalom, the Indian santoor and the Western hammered dulcimer are all close relatives. It is the ancestor of the struck box-zither family.
• "The bridges only support the strings." The *kharak* slide, and moving one changes the speaking length and therefore the pitch. Tuning means tuning strings *and* placing bridges.
• "Microtones mean out of tune." Quarter-tones are a deliberate modal device (*koron* down, *sori* up), set by moving bridges. Heard with an equal-tempered ear they sound "off"; that is a different tuning system, not a fault.

Next

Follow the family: the cimbalom is the same line engineered in the 19th century (legs, pedal, fully chromatic). The Chinese plucked entries will show the yangqin — what this line turned into after arriving in China in the Ming era. :::

Sources

• 尺寸与结构依通行制琴资料：等腰梯形音箱（宽边约 900、窄边约 350 毫米，箱高 60–100 毫米），共 72 根弦
• 「十八组弦（每组四根同音）、左右两组各九个可移动的桥（kharak）、三个音区（低音组 E3–F4 / 中音组 E4–F5 / 高音组 E5–F6）、总音域 E3–F6」依通行乐器学与制琴资料
• 「低音组用铜或青铜缠弦，中高音组用钢弦」「用两根轻木槌 mezrab 敲击，槌头可覆毡或棉」依通行资料
• 定音以 C 与 G 为基准、可移动的桥用于取得波斯古典音乐的四分之一音，依通行演奏传统
• ⚠️ 库内没有可确认为桑图尔的曲目 —— 本条给出的是同族（板箱弦乐器）曲目，音色由试听件负责

Used for fact-checking only; all prose is original.