Acoustical classification of woods for string instruments

Area of Science:

• Acoustics
• Materials Science
• Musical Instrument Design

Background:

• Stringed musical instruments utilize distinct wood types for soundboards (top plates) and frame boards (back and side plates).
• Traditional wood selection relies on empirical knowledge, lacking a systematic classification of acoustical properties.
• Understanding wood's acoustic behavior is crucial for optimizing instrument tonal quality and longevity.

Purpose of the Study:

• To propose a novel classification scheme for wood acoustical properties.
• To differentiate woods suitable for soundboards versus frame boards based on their acoustic characteristics.
• To provide a reference for selecting substitute woods when traditional options are scarce.

Main Methods:

• Introduction of the transmission parameter (propagation speed × Q value).
• Introduction of the antivibration parameter (density / propagation speed).
• Development of regression lines based on these parameters for traditional woods.

Main Results:

• The proposed parameters effectively separate woods for soundboards and frame boards.
• Two distinct regression lines highlight the different acoustic requirements for each wood type.
• The classification system provides a quantitative basis for wood selection.

Conclusions:

• The new classification scheme offers a scientific approach to wood selection for stringed instruments.
• The transmission and antivibration parameters serve as reliable indicators for wood suitability.
• This framework facilitates the identification of alternative woods, ensuring instrument quality and availability.