The Tense Series 경음: ㄲ ㄸ ㅃ ㅆ ㅉ (된소리)

The tense series — 경음, also called 된소리 ("hard sounds") — is the third and final column of the Korean consonant system: ㄲ ㄸ ㅃ ㅆ ㅉ. It completes a three-way contrast (plain / aspirated / tense) that has no parallel in English, which is precisely why it is the hardest part of Korean pronunciation for English speakers. There is no shortcut around it — but there is a clear physical description of what your mouth must do, and once you can produce the sound deliberately, the three-way sets fall into place.

Doubled letters = tense sounds

Each tense consonant is written as its plain letter doubled. The doubling is a good visual reminder that these are "extra" versions of the plain series — but not "two of the consonant." You do not say ㄱ twice; you say one consonant with the throat tightened.

What "tense" actually feels like

A tense consonant is unaspirated and unvoiced, produced with a tightened, constricted glottis (the space between your vocal cords) and a stiffened vocal tract. Three concrete cues:

1. Zero breath. Put your hand at your mouth: on ㅋㅌㅍㅊ you feel a strong puff; on ㄲㄸㅃㅆㅉ you should feel nothing escape. Any air at all, and you have said an aspirated consonant instead.
2. A tiny catch before it. The tensed glottis creates a micro-pause, almost like the catch in the middle of English "uh-oh." Medially, this makes tense consonants sound slightly doubled or held — 오빠 sounds like "op-pa" with a squeezed, held "p."
3. Sharp and hard. The release is crisp, tight, and a little louder than a plain consonant — but with no breath following it.

The nearest thing English gives you is the unaspirated p/t/k in "spy, sty, sky" (after "s," English strips the aspiration). That gets you the no-puff part — but Korean tense consonants add real glottal tension on top, which "spy" does not have. So: start from the "spy" consonant, then squeeze your throat and make it sharper.

The three-way contrast — the heart of the system

This is what you are really learning. For the stops and the affricate, one place of articulation supports three distinct words. Say each row slowly, feeling breath → big puff → squeeze:

The sibilant ㅅ is a special case: it has no aspirated member, only a two-way plain/tense contrast, ㅅ vs ㅆ.

Tense consonants never voice and never puff

The plain stop voices between vowels; the aspirate keeps its puff; the tense consonant does neither. Between vowels a tense consonant stays a tight, breathless [k͈ t͈ p͈ s͈ t͈ɕ] — never [g d b dʑ], never [kʰ tʰ pʰ tɕʰ]. The medial three-way is the ultimate ear-training drill:

• 아버지 — abeoji — middle ㅂ is voiced [b] (plain)
• 아파트 — apateu — middle ㅍ is aspirated [pʰ] (aspirated)
• 오빠 — oppa — middle ㅃ is tense [p͈] (tense): squeezed, held, no air

If you can hear and reproduce the difference between 아버지, 아파트, and 오빠 in the middle, you have the whole consonant system.

Where tense sounds appear on their own: 경음화

Beyond the words spelled with doubled letters, tense sounds also appear automatically through a sound-change called tensification (경음화): a plain ㄱㄷㅂㅅㅈ becomes tense right after a stop-sound batchim, even though it is written plain. So 학교 is pronounced [학꾜] hakgyo, 식당 is [식땅] sikdang, and 접시 is [접씨] jeopsi — the second consonant tenses even though you see a plain letter. That means you will hear tense consonants far more often than you see the doubled letters. The full rule is on the tensification preview and tensification after an obstruent pages.

Common Mistakes

1. Collapsing a tense consonant into the plain one (too little tension). This is the most common error: without the glottal squeeze, 짜다 (salty) slides into 자다 (sleep), and 싸다 (cheap) into 사다 (buy).

2. Adding a puff, turning a tense consonant into an aspirated one. Any escaping breath flips ㄸ into ㅌ — so 딸 (daughter) becomes 탈 (mask).

3. Voicing a medial tense consonant. Tense consonants stay tense even between vowels. The ㅃ in 오빠 is a squeezed [p͈], not a soft "b."

4. Softening the tense consonant in high-frequency everyday words. 진짜 (really) and 예뻐요 (pretty) are said constantly — with full tension. Let them go slack and they turn into non-words.

Key Takeaways

• ㄲ ㄸ ㅃ ㅆ ㅉ are written as doubled plain letters but are one consonant each: no breath, glottis squeezed tight.
• English has no tense series. Start from the unaspirated p/t/k in "spy/sty/sky," then add glottal tension.
• The three-way contrast is the core skill: 자다 / 차다 / 짜다, 달 / 탈 / 딸. The sibilant ㅅ/ㅆ is only two-way (no aspirated member).
• Tense consonants never voice and never puff, even mid-word — hear it in the trio 아버지 [b] / 아파트 [pʰ] / 오빠 [p͈].
• Tense sounds also arise automatically via tensification (경음화) after a stop batchim (학교 → [학꾜]), so you hear them more than you see the doubled letters.