Bridge Basics; Selecting the Right Bridge for Your Instrument
Bridge Acoustics
The Bridge Itself:
A lighter bridge works well with thicker violins, especially where the top is thick. A lighter bridge transmits more energy, helps volume, and improves responsiveness.
A thicker bridge works well with thinner violins; especially where the top is thinner. A denser bridge transmits less energy, softens, and adds overtones.
Bridge to Violin Top:
A bridge that fits the curvature of the violin top more precisely also transmits more sound.
Wooden violin tops deviate in curvature because they are usually hand-carved and made out of an anisotropic material - wood.
Soundpost placement, bridge placement, and use will change the instrument top over time.
Bridge to Strings:
The strings transmit energy from the bow through the bridge into the acoustic speaker; aka the body of the instrument.
Strength is very important. On a violin, the bridge bears roughly 22.7 kilograms (50 lbs) of pressure.
The material from which a bridge is fabricated also affects acoustics.