The bass benchWorkshop notebook / plate 7
Body resonance chamberFront elevation / not to scaleSection A–AWaist

A quiet connection.

The post stands between the front and back plates, close to the treble side of the bridge. It supports the top and couples the two plates as they vibrate.

Sound postBridgeBass barSection A–A / looking toward the neck
Position note: the orange post is on the treble side. The drawing makes its structural relationship visible; it does not specify an adjustment distance.

At the bench

Before touching the setup
Record the instrument, strings and room conditions. Listen to a familiar phrase.
One change at a time
Keep a written comparison. A brighter response is not automatically a better balance.
The player completes the picture
Ask how the instrument feels under the bow, across the strings and in the room.