The is a critical internal component of bowed string instruments like the violin, cello, and double bass . Often called the " soul " of the instrument ( l'âme in French), it is a small spruce dowel held in place by friction between the top and back plates. It serves two main purposes:

: Shifting it toward the middle of the instrument increases lower frequencies, while moving it outward increases brightness.

: Moving it toward the fingerboard generally increases these qualities.

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Moving the post even a fraction of a millimeter (as little as 0.25 mm) can drastically change an instrument's tone:

: It supports the massive downward pressure (often several kilograms) from the strings and bridge.

: It transmits vibrations from the top plate to the back plate, allowing the entire body to resonate. 🛠️ The "Sound Post" Retailer