Intermediate Characteristics

Itbaq & Infitah — Strongest Tafkhim

Itbaq: Tongue presses against upper palate — produces maximum heaviness.
4 letters: ص ض ط ظ — these combine both Isti'la and Itbaq, making them the heaviest letters.
Infitah: No tongue-palate contact — remaining 24 letters.
Common error: Not fully pressing for Ta (ط) and Dad (ض).
Source: Matn Al-Jazariyyah by Ibn Al-Jazari
Tags: إطباقانفتاحتفخيمص ض ط ظ

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What are the 4 Itbaq letters? Why are they the heaviest?
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