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PitchTimbreIntervalChinese Pentatonic ModesOcarinaDiziGuqinBianzhongRecorder

Among this group the xun is the odd one out: everyone else belongs to pipes; it does not.

⚠️ It is not a pipe — it is a cavity. | | Pipe (dizi, xiao …) | Xun | |---|---|---| | What sets the pitch | the length of the air column | cavity volume ÷ total open area | | Proper name | open / closed pipe | vessel flute | | Acoustic model | standing wave | Helmholtz resonator | In other words: a flute is tuned by how much it has been cut short; a xun is tuned by how much its cavity leaks. And that leads to a thoroughly counter-intuitive corollary: the xun's pitch hardly depends on *where* a hole is, but on *how much total area* is open. So its finger holes are placed mainly for the comfort of the hand, not by the physical positions that "cutting the pipe" would dictate — the exact opposite of the dizi.

Structure: a fired hollow

Three points:

1. The whole interior is hollow. Once the section is drawn, the difference from the dizi is plain: a flute is a passage, a xun is a cavity. 2. No duct. So unlike the ocarina it is not "blown into" — the player must shape the airstream angle to set the cavity's air in motion. 3. The holes can be placed for the hand. Since the pitch depends chiefly on total open area, where a hole sits matters far less than how much it opens — so the layout can serve the fingers rather than the physics.

Who decides where the holes go?

This figure is the heart of the page and the watershed with everything before it:

• A pipe's holes are dictated by physics: to get a given note you must open the hole at a particular proportion of the bore length — hence the dizi's unevenly spaced holes.
• A cavity's holes are dictated by ergonomics: because pitch depends on total open area, the shape of the arrangement barely matters — so the xun's holes can sit in a compact arc that suits the hand.

And that also explains why its timbre is unique: air vibrating as a volume is extremely rare among wind instruments — almost all of them vibrate a column, while the xun vibrates a body of air in a chamber. The few relatives (such as the ocarina) have ducts; the xun does not.

Range

埙属气鸣乐器（边棱音驱动，容器笛）。音域随音孔数量变化：河姆渡陶埙仅有吹孔，夏代埙 3 音孔只有 4 个音，春秋埙已能吹五声与七声音阶，现代改良为 8–11 音孔。此处按一件九孔埙的实测给出 D4–E5（全按 D4 · 全开 E5）；不同形制与孔数的埙音域不同，本图不代表所有埙。记谱即实音。

• Its range varies enormously with hole count: from a single note (Hemudu, no finger holes) to more than an octave (modern ten-hole). That is unusual among instruments — its range was built by addition.
• One nine-hole instrument measures: D4 with everything closed, E5 with everything open.
• It cannot overblow (another mark of a vessel flute): pitch comes only from the holes, with no "second excitation" available — so its ceiling is set entirely by hole count.

Timbre, and how to hear it

Four cues:

1. An "earth" tone. The clay cavity's resonance carries a plain, hollow, slightly breathy quality — ancients described it as deep, dim and lingering. 2. Bleak without being sharp. Not bright like the dizi, but low, contained and warm. 3. Quiet and effortful. With no duct, everything depends on the embouchure — its volume is inherently limited. 4. The *Book of Rites* calls it "the sound of the beginning of autumn" — an apt image: autumn sounds like this: receding, clean, a little cool.

Playing techniques

• The embouchure decides everything. With no duct, the angle and pressure of the breath set intonation and colour directly, and the instrument is rotated slightly to fine-tune.
• Fingers cover holes. Four in front plus two thumb holes behind (the count varies by model) — and because pitch depends on total open area, different fingerings can give nearly the same pitch, leaving room for the embouchure.
• No overblowing. A very practical difference from the dizi: there is no "press harder for a higher note".
• Intonation must be learned. A cavity instrument leans heavily on the player — the same xun sounds different in different hands.
• It belongs to ritual. From the Qin–Han onward the xun was chiefly a court ritual instrument, played in sets with bells, chimes and the chi flute.

The family

The axis in this family is "what shape of air is vibrating": a column, or a cavity. The xun stands on the second — and among all traditional Chinese wind instruments it stands there alone.

And once more, the batch's hidden line — "geometry sets the pitch":

History

Its history is a road "from tool to instrument": early on it may have been a hunting tool imitating bird and animal calls, gradually becoming a ritual instrument with a complete scale. And its hole count *is* the history of its range — from 0 to 11, one at a time.

Common misconceptions

• "A xun is a kind of flute." The outward difference is the least of it: a flute vibrates an air column, a xun vibrates a body of air in a cavity — a pipe and a vessel, two different acoustic models.
• "A xun is an ocarina." Both are vessel flutes, but the ocarina has a duct and the xun has none — which is why the xun demands far more of the embouchure and sounds earthier and darker.
• "Its range is inherently narrow." Traditional xun were indeed narrow (a few notes early on), but a modern 8–11 hole xun covers more than an octave — the range was added hole by hole.
• "Where the holes go is critical." For a xun it is not: pitch depends mainly on total open area, so the layout serves the fingers — the opposite of a pipe.
• "It belongs to bamboo in the bayin." It is earth — made of fired clay. Here the bayin's classification is at its most literal: it really is made of earth.
• "It can only play sad music." It is indeed known for bleakness and called "the sound of early autumn", but as a ritual instrument its function was ceremony, not merely lament.

Next

The earth category is complete (the xun). Four bayin categories remain: hide · wood · gourd · stone — and the next instrument turns to hide: the tanggu, a drum. If the xun is "air in a cavity sounding" and the bianzhong is "bronze sounding", a drum is a stretched skin sounding: its pitch is set by how tight the skin is — which makes it the first struck instrument on this site whose pitch can be changed on the spot. :::

Sources

• 形制依通行乐器资料：陶土烧成的空腔体，顶端有吹孔、腔侧有音孔；底端封闭；无哨口
• 「埙属气鸣（边棱音驱动）· 器身呈腔体而非管状」依 Hornbostel–Sachs 分类 —— 即容器笛（vessel flute）
• 「埙是典型的亥姆霍兹共振器：音高主要取决于腔体内部空气团的体积以及所有开口（吹孔与音孔）的总面积；因此开孔的位置与顺序对音高的绝对影响较小，其布局主要以符合演奏者手指的人体工学为准」依乐器声学资料
• 「绝大部分吹奏乐器依据空气柱振动发音，极少见由腔体空气振动发音的乐器」依乐器声学资料
• 历史依考古资料：浙江余姚河姆渡遗址陶埙距今约七千年（仅有吹孔、无音孔）· 陕西西安半坡遗址距今约六千年 · 夏代 3 音孔（4 声音列）· 商代材质有陶 · 石 · 骨 · 春秋已有 6 音孔（可吹五声与七声音阶）· 秦汉以后主要用于宫廷雅乐 · 现代改良为 8–11 音孔
• 「一件九孔埙的实测：全按音孔为 D4，全开为 E5」依乐器实测资料（本页音域图据此）
• 「半坡与荆村遗址出土陶埙的测音分析发现其音程结构为小三度；黄翔鹏指出小三度在民族音阶发展过程中占重要位置」依音乐考古资料
• 「埙在八音中属土音；《诗经·小雅》有『伯氏吹埙，仲氏吹篪』」依文献 — 埙属于八音中的土

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